JP2006178126A - Back light type display method and device, and back light system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the availability of light beams from a back light qnd apperture ratio by improving the display method without causing problems such as color split. <P>SOLUTION: R, G and B belt-like spot light beams are individually generated, the beams are moved along the orthogonal direction with respect to the longitudinal direction of the row electrodes on a display region and a panel is irradiated by the beams as back surface light beams. First to third spot light beams of R, G and B and fourth spot light beams of equal to one or more colors among R, G and B repeat movement in the display region. Address specifying, which selects the specific irradiating position within the irradiation range of the spot light beams on the display region or the row electrode of the pixels of the specific boundary adjacent position outside the irradiation range, is repeated following the spot movement and the pixels of the selected row electrode are driven by the corresponding color. In a virtual region 500, which is ruled to form a spot light beam sequence, spot light beams, to which R, G and B colors having more number of spot light beams of the display region are assigned, repeat the movement in the virtual region and the spot light beams of an effective range 510 of the spot light beams on the display region are made as the first to the fourth spot light beams. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a backlight type display method and apparatus, and a backlight system.

  A display device using a backlight causes light emitted from the backlight to enter a transmissive display panel, modulates the light according to an image to be displayed, and transmits the resulting modulated light to the front surface of the panel. It is configured to display an image by guiding it from the outside to the outside.

  Patent Document 1 describes a liquid crystal display device that belongs to such a type and realizes a configuration that does not require a color filter in a display panel using a backlight. In this apparatus, the backlight is composed of linear light sources of R (red), G (green), and B (blue) along the scanning line of the screen, and the scanning line of the display panel is displayed from the top of the screen within one frame period. The image signal of any one color corresponding to the selected scanning line is sequentially selected (addressed) toward the lower part and written to the pixel of the scanning line, and the color and selection of the image signal are synchronized with this writing. Color display is performed by repeating the operation of turning on the linear light source corresponding to the position of the scanning line, while sequentially switching the colors to be displayed for each frame.

Further, Patent Document 2 discloses a liquid crystal display device of the same type that does not need to be provided with a color filter on the display panel. This device is devised to enable high-speed driving.
Japanese Patent Laid-Open No. 10-10997 (in particular, see paragraph numbers [0001] and [0016] to [0019]) Japanese Patent No. 3280307 (in particular, see paragraph numbers [0002] to [0010] and [0019] to [0059])

  However, in the display device described in Patent Document 1, the address designation for a certain color frame image and the switching of the color of the backlight irradiation light corresponding thereto are not performed from the top to the bottom of the screen. The address designation for the color frame image and the switching of the color of the backlight irradiation light corresponding thereto are not performed. Therefore, since the cycle of switching all colors is as long as one frame, flicker is likely to occur, and before starting to display a new color spatially, it is necessary to occupy and display the old color once in a large area of one screen. There is an aspect that the color synthesis (hybridization) is rough. Therefore, when the user blinks or suddenly changes the line of sight and looks at the screen, or when the image to be displayed contains a component with a large movement width per unit time, etc. The action is not effective and a situation where only one or two color image information is visually recognized instantaneously, that is, so-called color breakage easily occurs.

Also, in Patent Document 2, although high-speed pixel driving is realized with a liquid crystal material with low responsiveness, only a maximum of three colors can be displayed in the display area, and measures against color breakage are insufficient. It is.
(the purpose)

  The present invention has been made in view of such problems, and an object of the present invention is to provide a display method and apparatus capable of preventing the above-described color breakup and a backlight system compatible therewith. There is.

  Another object of the present invention is to provide a display method and apparatus, and a backlight system, which can be improved without causing problems such as color breakage and improve the utilization efficiency of light from the backlight and the aperture ratio of the display panel. It is to be.

  In order to achieve the above object, a first aspect of the present invention is a transmissive matrix display in which a plurality of row electrodes and a plurality of column electrodes are arranged and pixels are driven based on signals supplied to the row electrodes and column electrodes. A display method using a panel, wherein at least first to third color band-shaped spot lights formed along the row electrodes are individually generated, and these spot lights are generated on the display area of the display panel. A backlight system that irradiates the display panel with the spot light as back light while being moved in a direction perpendicular to the longitudinal extension direction of the first to third colors of the first to third colors in the display area. While exhibiting a third spot light and a fourth spot light of one or more colors selected from the at least first to third colors, each of the spot lights is Repeated movement from one end of the display area to the other end opposite thereto, for each of the spot lights, a specific irradiation position within the spot light irradiation range or a specific boundary adjacent position outside the spot light irradiation range in the display area An addressing operation for selecting a row electrode associated with a pixel corresponding to the pixel is repeated in accordance with the movement of the spot light, and the column electrode is driven to drive a pixel associated with the selected row electrode in response to the addressing operation. Supply a pixel information signal relating to the color of the spotlight to be irradiated or to be irradiated at the position of the pixel, define a virtual area for forming a sequence of spotlights to be presented in the display area, More than the number of spot lights presented in the display area and the spot lights to which the first to third colors are assigned Each of them repeats the movement from the beginning to the end of the virtual area, the effective range of the spot light to be presented in the display area is defined in the virtual area, and the spot light within the effective range is used as the first to fourth spot lights. The display method used is used.

  By doing so, it is not necessary to provide a color filter on the display panel, and the utilization efficiency of the back light from the backlight is improved with the aperture ratio and the light transmittance. Further, in the display panel, it is not necessary to provide subpixels corresponding to the first to third colors, and only the main pixel can be configured. Therefore, the number of column electrodes is 1/3 that of the subpixel configuration. This contributes to simplification of the display panel structure and reduction of manufacturing costs. Since one main pixel also serves as the pixel display of the first to third colors, if the size of the main pixel is reduced by applying a fine formation process of a sub-pixel size level that can be realized conventionally, the size of the main pixel is reduced. Resolution will also be achieved. Since at least four spot lights simultaneously exist in the display area and the pixel information for each is effectively displayed, it is possible to finely effect the color composition and avoid the above-described color breakup. In addition, it is advantageous in displaying moving images. Moreover, by using the virtual area, not only can the number of spot lights appearing on the screen be increased, but also the movement pattern can be complicated, so that the effect of preventing color breakup can be further enhanced. Become.

  In this aspect, a black spot or other light transmission preventing spot may be formed between one side and the other side of the spot light. As a result, a color mixing portion that occurs in the overlapping portion of the spot light or the like is prevented in advance, and display of undesired light by the color mixing portion is avoided. Such a light transmission preventing spot is a spatially minute region and temporally temporary, and therefore does not greatly affect the image to be displayed.

  In addition, the movement of the spot light and the addressing operation may be performed with synchronous timing control. Thereby, the movement of the spot light on the backlight side and the addressing operation on the panel side can be reliably performed.

  Preferably, after the addressing operation and the driving of the pixel by the pixel information signal are completed, the movement of the spot light is performed by changing the color of the irradiation light to the pixel related to the selected one or more row electrodes. It is recommended that The addressing operation and the supply of pixel information, i.e. the writing of the pixel, usually presents a transient state of the pixel regardless of the applied pixel driving active element or the pixel driving structure. Even if the corresponding spot light is applied to the pixel in a period in which the transient state can be exhibited, appropriate pixel information is not displayed. According to this embodiment, since the pixel of the selected row electrode is irradiated after the pixel writing operation, it is possible to modulate the appropriate spot light according to the appropriate pixel information. In addition to this, the backlight system is in the middle of writing a pixel by stopping the light irradiation to the pixel related to the selected row electrode during the addressing operation and the supply of the pixel information signal. Then, since the pixel is not irradiated with light, the pixel is in a dark state, and pixel information that exhibits a transient change can be hidden. For the same purpose, the addressing operation and the supply of the pixel information signal may be performed on a row electrode related to a pixel at a position where the light transmission preventing spot is formed. This is because if the pixel information writing transient state is exhibited at the light transmission preventing spot, improper modulation due to the transient state is not affected by the display.

  It is also preferable to drive the pixels corresponding to the spot light overlapping portion or boundary and / or the vicinity thereof with a predetermined pixel information signal capable of preventing light transmission. This is because the so-called color mixture is likely to occur in the adjacent portion of the spot light. Therefore, by driving the pixel corresponding to the color mixture portion with pixel information such as the black level (preferably the darkest pixel information), the color mixture light This prevents the display quality from being deteriorated due to transmission. Here, the driving of the pixels corresponding to the overlapping portion or boundary and / or the vicinity region of the spot light is performed based on simultaneous selection of a plurality of row electrodes and simultaneous supply of the predetermined pixel information signal to these selected row electrodes. In this way, efficient control is achieved.

  The first to third colors are surely good by defining red, green and blue, or a basic color that can present a predetermined color other than white or white when mixed, and A desired full-color image can be obtained. Each of the spot lights has a unique width, at least one width of the spot light is variable, or at least one intensity of the spot light is variable. This expands the possibilities of color balance adjustment.

  In addition, the range of pixels driven by the predetermined pixel information signal corresponds to the color mixture portion generated around the boundary portion of the spot light, and has a width equal to or greater than the width of the color mixture portion. It is possible to sufficiently block light that slightly leaks from the portion, and to further improve the display quality.

  Depending on the form of the backlight system, the spot light is moved substantially simultaneously or sequentially on the display area. In addition, since one period of movement of the spot light on the display area corresponds to one frame period of an image to be displayed, consistency with the original image information signal is ensured.

  In order to achieve the above object, a second aspect of the present invention is directed to a backlight system used in the display method according to the above aspect and form, one of which is the first to third colors. A plurality of linear irradiation units that selectively irradiate light has a configuration that extends along the row electrodes and is arranged over the display region, and the next irradiation of the irradiation unit corresponding to the forefront of the spot light By switching control so that the unit emits light of the color of the spot light, the backlight system moves the spot light.

  The second is a linear light source, a reflector for condensing the light from the light source on the linear irradiation surface, and moving the colored film to pass the colored film above the irradiation surface. Possible coloring means, and light distribution conversion means for converting the linear light guided from the irradiation surface and transmitted through the colored film into a planar distribution of light, the colored film, A backlight system having a pattern in which light of the first to third colors is formed, and moving the spot light in the display region by an operation of passing the colored film on the irradiation surface in the coloring means. It is said. According to this, this display method can be realized with a single light source. If the colored film has a colored region corresponding to each of the first to third colors and a light blocking region formed at a joint portion of these colored regions, the colored film has a better form. Is more practical if it is a cylindrical colored drum that surrounds the linear light source and rotates about a predetermined central axis as a rotation axis and the colored film is formed on the surface portion.

  Further, the third is a light guide configured by using a plurality of light guide portions extending along the row electrode with a width that can overlap pixels related to at least one row electrode, and arranging them over the display region. A light collecting unit, and an optical system for selectively allowing the first to third color lights to enter the end surfaces of the light guide member in the light guide member collecting plate. By switching and controlling the optical system next to the optical system corresponding to the front line so as to emit light of the color of the spot light, the backlight system moves the spot light. This leads to a good realization of the present display method even with a so-called edge light type light source. Here, the light guide portion includes a groove portion or other reflective structure that extends in a direction orthogonal to the longitudinal extension direction and has an inclined surface for reflecting light from the optical system so as to direct the light toward the display region. By having it, the light distribution in the longitudinally extending direction of the light guide body can be equalized. Further, a partition wall layer made of a material having light reflectivity or a refractive index lower than a refractive index of the light guide body portion is provided between the light guide body portions in the light guide body assembly plate. By doing so, it becomes possible to satisfactorily ensure the independence of the linear shapes of the sub spot lights constituting the spot light. Furthermore, a condensing optical member can be provided between the optical system and the end face of the light guide body, and a more efficient system can be constructed.

  Still other aspects of the present invention are also directed to display devices derived in the above and following descriptions, and enjoy various advantages relating to display methods and backlight systems, as well as device-specific advantages. .

  Hereinafter, the above-described aspects and other embodiments of the present invention will be described in detail based on examples with reference to the accompanying drawings.

  FIG. 1 shows a basic schematic configuration of a liquid crystal display device according to an embodiment of the present invention.

  In the figure, this liquid crystal display device mainly controls a transmissive liquid crystal display panel 1, a backlight unit 2 disposed on the back side of the liquid crystal display panel 1 and irradiates light on the back surface of the panel 1, and the panel 1 and the backlight unit 2. Or peripheral circuits that generate and supply necessary signals and voltages for driving.

  The liquid crystal display panel 1 allows a liquid crystal layer (not shown) sandwiched between two opposing transparent substrates to carry out optical modulation corresponding to an image to be displayed. The liquid crystal display panel 1 has an active matrix type configuration in this example, and one substrate 11 on the back side thereof has, for example, a field effect thin film transistor (TFT) as an active element for pixel driving in a predetermined display area. ) 12 are arranged in a matrix corresponding to each pixel. The gate electrodes of these TFTs 12 are a plurality of row electrodes Gx (x = 0, 1, 2,...; Hereinafter referred to as “gate lines” as appropriate) that constitute so-called scanning lines that run parallel to each other in the horizontal (horizontal) direction in the display region. .., And a plurality of column electrodes Sy (y = 0, 1, 2,...; Constituting the so-called signal lines that run parallel to each other in the vertical (vertical) direction in the same display region. Called "source line"). The drain electrodes of the TFTs 12 are individually connected to the pixel electrodes 13.

  The substrate 14 on the front side, which is the other substrate of the display panel 1 and is disposed to face the back substrate 11 with a gap, has a common electrode 15 formed over the main surface (the inner surface of the panel) facing the pixel electrode 13. I have. A liquid crystal medium (not shown) is sealed in the gap between the substrate 11 and the substrate 14 to form a liquid crystal layer.

  The TFT 12 is selectively turned on for each row by a gate signal as a row electrode signal (or row selection signal) supplied through the gate line Gx, while being supplied through the source line Sy to each turned-on TFT. The drive state is set in accordance with the pixel information to be displayed according to the level of the source signal as the column electrode signal (or pixel information signal). A potential corresponding to the driving state is applied to the pixel electrode 13 by its drain electrode. The orientation of the liquid crystal medium is controlled for each pixel electrode by an electric field having a strength determined by the difference between the pixel electrode potential and the voltage level supplied to the common electrode 15. Therefore, the liquid crystal medium can control the amount of light transmitted to the front side by modulating the backside illumination light from the backlight unit 2 according to the pixel information for each pixel. Details regarding the basic configuration of such a liquid crystal display panel are well known in a wide variety of documents and will not be described further here.

  In this example, the display panel 1 does not have a color filter layer that has been customarily used for full-color display. This is because the backlight unit 2 assumes the function of the color filter, as will be apparent below. Therefore, the display panel 1 may be a so-called monochrome display panel. However, it is not excluded to supplementarily provide a color filter exhibiting a certain single color for a specific purpose, if necessary.

  The backlight unit 2 has a configuration that at least finally performs surface illumination, and the illumination range covers the effective display area of the display panel 1. In addition, the backlight unit 2 is in the form of a longitudinal shape arranged in parallel with each other along the gate line Gx. In this example, the backlight units 2 are responsible for all kinds of so-called primary color lights of red, green and blue, respectively. Band-shaped spot lights 2R, 2G, and 2B are individually generated. The spot light is moved on the display area of the display panel 1 in a direction (vertical direction in FIG. 1) perpendicular to the longitudinal direction of the spot light (horizontal direction in FIG. 1). Irradiate as back light. The backlight unit 2 is controlled such that each of the spot lights 2R, 2G, and 2B moves from one end of the display area to the other end opposite thereto, and the movement pattern is repeated. Here, only three spot lights 2R, 2G, and 2B are shown here to explain the basic configuration and operation. However, according to the present invention, at least four spot lights are used in the display panel 1. is there. This point will be described later. Details of the configuration and control of the backlight unit 2 will also be described later.

  In FIG. 1, peripheral circuits shown as components other than the display panel 1 and the backlight 2 can be broadly classified into three: a display panel drive system 3, a backlight drive system 4, and a system control system 5. .

  The display panel drive system 3 includes a buffer memory 31 and an image memory 32 as image signal processing means, a source driver 33 as column drive means, a gate driver 34 as row drive means, and voltage generation as common electrode drive means. Circuit 35.

  The buffer memory 31 serially receives digital image signals of red (R), green (G), and blue (B) for one frame from an image signal supply system (not shown), and temporarily stores them in the order of frames. That is, the stored image signal is read out for each scanning line based on a control signal from the timing controller 51 and transferred to the image memory 32 while being written. The image memory 32 stores the transferred image signal based on the control signal from the timing controller 51 and performs read control adapted to the control of the backlight unit 2 described later. In the frame in which the reading control is performed, the image signal of the next frame is written in the buffer memory 31. When data of a certain scanning line is read in the image memory 32, data corresponding to the read scanning line is read from the buffer memory 31 and written to the image memory 32. An image signal is read from the image memory 32 for each scanning line, and the read image signal is transferred to and held in the source driver 33 based on a control signal from the timing controller 51. The source driver 33 supplies the held image signal for one scanning line to the source line Sy as a source signal (pixel information signal) corresponding to each pixel.

  The gate driver 34 performs control to select one of the scanning lines, that is, the gate line Gx based on a control signal from the timing controller 51, and this is also adapted to control of the backlight unit 2 described later. The selection of the gate line is performed by generating a gate signal for applying a predetermined high level, for example, to the gate line to be selected.

  The voltage generation circuit 35 supplies an appropriate voltage signal to the common electrode 15 based on the control signal from the timing controller 51. This voltage signal can be a direct current, but can also be an alternating current according to a so-called alternating current driving method. The level of this voltage signal becomes the reference potential of the source signal supplied to the source line Sy.

  The backlight drive system 4 includes a backlight driver 41 and other necessary components (not shown). The backlight driver 41 drives the backlight unit 2 based on the control signal from the timing controller 51 under the control specific to the present invention. Such control can take various forms and will be described in detail below.

  As the system control system 5, a timing controller 51 capable of pre-programming processing steps is employed in this example. The timing controller 51 receives a synchronization signal of an image signal from an image signal supply system (not shown), and generates various control signals that bear the timing and operation instructions necessary for the blocks 31 to 35 and 41 based on this signal. The synchronization signal received here may include a dot clock signal indicating data transfer timing for each pixel, a so-called horizontal and vertical synchronization signal, a frame synchronization signal indicating a frame period, and the like. The timing controller 51 generates a control signal for performing control unique to the present invention, which will be described later, based on these synchronization signals.

  Next, the basic operation of such control will be described with reference to FIGS.

  FIG. 2 shows the movement of spot lights 2R, 2G, and 2B irradiated on the display panel 1 from the backlight unit 2 on the screen, and also shows how scanning lines are selected along with the movement of the spot light. .

  As described above, the spot lights 2R, 2G, and 2B move on the display area in a direction orthogonal to the longitudinal direction of the spot light (up and down direction in FIG. 2), and each of them is opposed to this from one end of the display area. The movement is repeated toward the end, and the movement pattern is repeated. In this example, these patterns move from the upper edge to the lower edge of the screen.

  First, in the situation where the display panel 1 is irradiated as shown in FIG. 2A, the red spot light as the first spot light is divided into the upper and lower edge sides of the screen, Between these, there is a green spot light as the second spot light and a blue spot light as the third spot light. Each spot light has a width of a value obtained by dividing the height of the screen into three in this example, and moves while maintaining the total width appearing on the screen. In a situation where a spotlight crosses the bottom edge of the screen, the same spotlight is split and part of it appears at the top of the screen, but the bottom width and top width of the spotlight are combined. The width is kept at one third of the screen height.

  In the situation of FIG. 2A, the display panel 1 is controlled so that the scanning lines corresponding to the irradiation positions of the red, green and blue spot lights are sequentially selected (addressing operation). In this example, a scanning line at a location close to the lower spot light adjacent to the spot light in the irradiation range of each spot light is selected. In the case of FIG. 2A, the nth scan line corresponds to the red spot light, the n + xth scan line corresponds to the green spot light, and the n + yth scan line corresponds to the blue spot light. To be elected. The n-th, n + x-th, and n + y-th here mean the order when the scanning line at the top of the display area is the first, and the scanning lines are counted sequentially from this line downward, The same applies to the following. X and y represent the distance between the scanning line selected for the red spot light and the scanning line selected for the green spot light and the scanning line selected for the blue spot light by the number of scanning lines. The same applies to the following.

  After the selection of the nth, n + xth, and n + yth scan lines, the backlight unit 2 transitions to the state shown in FIG. In this situation, the irradiation position of each spot light in FIG. 2A is shifted down by one line. Here again, the display panel 1 is controlled so that scanning lines relating to pixels corresponding to specific irradiation positions of red, green and blue spot lights are selected. Accordingly, the (n + 1) th scanning line corresponding to the red spot light, the (n + x + 1) th scanning line corresponding to the green spot light, and the (n + y + 1) th scanning line corresponding to the blue spot light are selected.

  Similarly, in FIG. 2C, which is one step further advanced, the (n + 2) th scanning line corresponds to the red spot light, and the (n + x + 2) th scanning line corresponds to the green spot light. Correspondingly, the n + y + 2nd scan line is selected. In this way, the scanning line for each spot light on the display panel 1 is selected so as to follow the movement of each spot light.

  The operation described so far is shown in more detail in the first half of the time chart of FIG.

  In FIG. 3, the selected scanning line (gate line) is indicated by adding the selected line number every time the selection is switched in the “Gt” section. For example, if “n + x” is added to the line number in “Gt”, the gate signal for supplying the gate signal for turning on the TFT coupled to the selected line is selected from the n + xth scanning line. Means.

  Further, as one representative example of the source lines for driving the pixels related to the selected scanning line, source signals supplied to the mth source line Sm (see FIG. 2) counted from the left side of the display area are shown in FIG. In the “Sm” section, the number of the corresponding scanning line and the color (R, G, B) of the corresponding pixel information are indicated. For example, if the corresponding scan line number is “n + x” and the corresponding color is “G” (green) in “Sm”, the pixel related to the n + xth scan line and driven by the source line Sm This means that a source signal (Gn + x, m) carrying pixel information for displaying a pixel as a green pixel is supplied to the source line Sm. As can be seen from FIG. 3, the source signal is updated every one third of the horizontal scanning period (H). This corresponds to a pixel information signal supply operation.

  In FIG. 3, the waveform of the gate signal supplied to the nth gate line Gt is shown in the section “Gt-n” as a representative example. As can be seen from this, the gate signal becomes active (high level) slightly later than the update time of the source signal in the update cycle of the source signal indicated by “Sm” in this example, and becomes non-slightly before the next update. Active (low level). While the gate signal is active, all TFTs to which the gate signal is supplied are kept on, and potentials corresponding to the source signals supplied through the respective source lines are applied to the respective drains and pixel electrodes. Is possible. As a result, the pixel Pn, m driven by the nth gate line (Gt-n) and the mth source line (Sm) responds to the rise of the gate signal as shown in FIG. New pixel information (Rn, m) is written. Here, “Rn, m” means that red (R) pixel information is captured for the pixel addressed as the nth row and mth column.

  On the other hand, the driving mode of the backlight unit 2 is shown in the “L” section. In “L”, the number of the scanning line corresponding to the position where the color of the spot light is switched and the colors (R, G, B) before and after switching are indicated. In “L”, for example, if the scanning line number is “n” and the color before and after switching is “G → R”, a green spot light has been irradiated until then at the position corresponding to the nth scanning line. Is switched to irradiation with red spot light. In FIG. 3, the driving state of the irradiation unit of the backlight unit 2 corresponding to the spot light switching position corresponding to the nth scanning line is shown as “Ln” as a representative example. Each irradiation unit formed in the backlight unit 2 can selectively emit or transmit any of red, green, and blue light. The irradiation unit according to the nth line is here In this case, switching is performed to turn off the green light irradiation (Goff) and turn on the red light irradiation (Ron).

  Preferably, the G → R switching is performed after a sufficient time has elapsed since the new data Rn, m is written in the pixel Pn, m. This is because the pixel exhibits a transient state from the actual writing operation to the pixel of the new data until the pixel information based on the new data is stably held, so when the color of the irradiation light is switched in this transient state, This is because the irradiation light after switching is improperly modulated. Therefore, it is preferable that the “sufficient time” here exceeds the time from the start of writing new data until the pixel stably holds the pixel information of the new data.

  When G → R is switched before writing new data Rn, m, a period during which the irradiation light (red light) after modulation is modulated by old data (green data Gn, m) in the pixel. On the other hand, even if G → R is switched after writing new data Rn, m, the irradiation light (green light) before switching is modulated by the new data (red data Rn, m) in the pixel. In any case, erroneous pixel information is displayed although the period is relatively short. Therefore, as indicated by the dotted waveform (Goff ′, Roff ′) in the “Ln” section of FIG. 3, before the new data is written to the pixel, the irradiation of the light of all colors to the line to be written is cut off. However, it is preferable to perform light irradiation of the corresponding color after writing the new data. More specifically, when the irradiation unit Ln of the backlight unit 2 corresponding to the position of the selection line (Gt−n) switches from G to R, first, the green light irradiation is turned off (Goff ′), and the selection line After writing the data, red light irradiation is turned on (Ron). That is, the light corresponding to the old data is turned off, the data writing is performed while the lights of all the colors are off, and the light corresponding to the new data is turned on after a sufficient time (see above) has passed. To do. By doing so, since the data of the selected line is written at the position and time when the irradiation is not performed, the irradiation light is not erroneously modulated, and the non-irradiation position and period are displayed in black (black spot). Thus, only the unnecessary display is hidden, so to speak, it functions as a spatiotemporal light transmission preventing black mask and improves the visual quality of the image to be displayed. In FIG. 2, the depiction of such a black mask is omitted.

  After switching the color of the spot light corresponding to a certain scanning line, the switching state is maintained until the time when the subsequent spot light irradiates the position corresponding to the same scanning line comes. As can be seen from FIG. 3, the backlight unit 2 sequentially performs color switching of the spot light for each of R, G, and B in each horizontal scanning period (H) so that each spot light moves on the screen. Corresponding to the switching, a scanning line corresponding to the switching position is selected, and pixel information relating to the selected scanning line is written. In other words, for each color, the operation of switching the color of the spot light at the position corresponding to the selected line is performed after the pixel information of the selected scan line is written for each horizontal scanning period. By doing in this way, operation | movement of (A)-(C) of FIG. 2 can be performed.

  FIG. 2D shows a situation in which the movement of the spot light further progresses, and the blue spot light appears on the upper and lower edge sides of the screen and the red spot light and the green spot light continue in the meantime. This figure also shows how the (n−1) th, n + x−1th and n + y−1th scan lines are selected. This corresponds to a situation in which the scanning line immediately before (in terms of space) the scanning line selected in the previous diagram (A) is selected. In FIG. 2E, the movement of the spot light further progresses. The n-th scanning line corresponds to the blue spot light, the n + x-th scanning line corresponds to the red spot light, and the green spot light. Correspondingly, the n + yth scanning line is selected. This corresponds to a situation where the same scanning lines as those in the previous diagram (A) are selected. In FIG. 2F, as the next step, the (n + 1) th scanning line corresponds to the blue spot light, the (n + x + 1) th scanning line corresponds to the red spot light, and the (n + y + 1) corresponding to the green spot light. This shows a state in which the second scanning line is selected, which is the same selection line as in the previous diagram (B).

  These operations (D) to (F) are shown in the latter half of FIG. 3 in the same manner as (A) to (C).

  Pay particular attention to the operation corresponding to (E) of FIG. As shown in FIG. 3, in the first divided period (H / 3) of the horizontal scanning period in which the gate signal corresponding to the nth scanning line Gt-n rises, the pixel information of the data Bn, m in the source line Sm The data Bn, m is written to the pixel Pn, m coupled to the nth scan line in response to the high level of the gate signal. In the backlight unit 2, the irradiation unit that irradiates the position corresponding to the nth scanning line switches from R to B. Therefore, during this period, the irradiation unit switches from the state in which red (R) has been irradiated to the state in which blue (B) is irradiated, and then the next spot light (G) is scanned by the same scanning. The switching state is maintained until it is time to irradiate the position corresponding to the line (not shown).

  In this example, the irradiation color switching period of the irradiating unit is basically set to the number of lines (x or xy) corresponding to the width of the spot light, that is, the length of one third of the screen height. The time T is a value obtained by multiplying / 3 (H is one horizontal scanning period), and the duration of the irradiation color is T-α. Here, α is a temporal shift amount grasped when the timing for turning off the specific color irradiation of the irradiation unit is shifted to the time before data writing, as referred to by Goff ′ and Roff ′ described above. Equivalent to.

  After (F) in FIG. 2, the selection of the scanning line and the writing of the related pixels as described above and the switching control of the backlight unit 2 are repeated. A period from when pixel information of a certain color is written to a pixel related to a certain scan line to when pixel information of the same color is written to the same scan line is an original image signal (an image supplied to the buffer memory 31 in FIG. 1). Signal) frame period. In this frame period, each spot light irradiates the entire screen area, and all the scanning lines on the screen are selected for pixel information of all colors in accordance with this.

  Thus, a full color image display can be obtained by repeating the operation described with reference to FIG. In this example, basically, the display panel 1 is not provided with a color filter layer, so that no light loss occurs in the layer, which can contribute to an improvement in light utilization efficiency. Further, the display panel 1 does not need to adopt a configuration in which one main pixel is configured by sub-pixels of three colors of R, G, and B, and can be configured with only the main pixel, so that the number of pixels is reduced. In addition, the aperture ratio can be remarkably increased, and the panel structure can be simplified and the manufacturing cost can be reduced.

  FIG. 4 shows a specific configuration of the backlight unit 2 and its irradiation mode.

  The left side of FIG. 4 shows a cross-sectional structure of the backlight unit 2, and the right side shows a planar structure of the backlight unit 2 when the backlight unit 2 is incorporated in the display panel 1 and an aspect of the irradiation light on the plan view. ing. The backlight unit 2 includes a transparent light guide plate 20 made of, for example, acrylic resin, and a linear light source unit 21 provided on the light guide plate 20. The light guide plate 20 is formed with a large number of concave cross-sectional grooves 201 at predetermined intervals on the main surface on the light irradiation side for storing the main light emitting portion of the linear light source portion 21. In FIG. 1, the lines extend in parallel in a straight line from side to side.

  The linear light source unit 21 is configured based on the concave cross-sectional groove 201. First, a light emitting diode layer 20 </ b> B capable of emitting blue light is formed at the bottom of the groove 201. On the layer 20B, a light emitting diode layer 20G capable of emitting green light and a light emitting diode layer 20R capable of emitting red light are sequentially stacked. The layer 20B emits blue light by itself when a blue light emission command signal is applied, and this light passes through the other light emitting layers 20G and 20R and is irradiated to the display panel 1 as a linear spot along the scanning line. . The layers 20G and 20R also emit green and red light, respectively, when green and red light emission command signals are applied, and these lights are emitted to the display panel 1 as linear spots along the scanning lines.

  A notch 202 extending in parallel with the longitudinal direction of the concave cross-sectional groove is provided between one and the other of the concave cross-sectional grooves 201. Here, the notch 202 forms a narrow passage space that extends from the irradiation surface side of the backlight unit 2 to the depth of the substantially concave groove 201, and air or other medium exists in the space. The passage space of the notch may be formed so as to exceed the depth of the concave cross-sectional groove 201 or reach the back surface of the light guide plate 20.

  On the back surface of the light guide plate 20, a plurality of longitudinal light diffusion reflection films 203 are formed for each linear light source unit 21. The light diffusing and reflecting film 203 is formed along the concave cross-sectional groove 201 in parallel with each other and facing the bottom surface of the concave cross-sectional groove 201, respectively. The reflective film 203 reflects the light leaking from the light emitting layers 20R, 20G, and 20B to the back side and returns it to the front (irradiation surface) side to effectively use the light, and diffuses the reflected light to display the display panel. This contributes to equalization of the luminance distribution of the linear light spot corresponding to 1.

  The notch 202 reflects light from the light emitting layers 20R, 20G, and 20B based on the presence of air or the like in the passage space. As a result, a long rectangular region along the scanning line having the notch 202 as a demarcation boundary can be used as an irradiation region of one linear light source unit 21. The light from the light emitting layers 20R, 20G, and 20B is directed to the display panel 1 directly or through the internal refraction of the light guide plate 20, and the light that travels after reflecting the reflective film 203, the light that travels after being reflected by the notch 202, and the like. However, except for those that are directly irradiated, these act so as to equalize the luminance of light in the rectangular irradiation region by propagation inside the light guide plate 20.

  The backlight unit 2 having such a configuration is controlled so as to switch the emission color of the linear light source unit 21 corresponding to the scanning line selected on the display panel 1. For example, in the situation shown in FIG. 2A, after the nth scan line is selected and the corresponding red pixel information is written, the position on the display area of the nth scan line is irradiated. The light source unit 21n is switched to emit red light (FIG. 4 (1)). Similarly, for the n + x-th scanning line, the light source unit 21n + x for irradiating the position on the display area of the n + x-th scanning line is switched so as to emit green light (FIG. 4 (2)), and n + y The light source unit 21n + y for irradiating the position on the display area of the n + y-th scan line is also switched so as to emit blue light for the n-th scan line (FIG. 4 (3)). For the other linear light source units 21, any of red, green, and blue corresponding to the spot light to be formed presents strip-like spots 2R, 2G, and 2B as shown in FIG. The emission of that color is sustained. The light source units 21n, 21n + x, and 21n + y respond to the scanning line selection timing corresponding to the position to be irradiated, and control signals (red, Green or blue light emission command signal) is supplied. The details of scanning line selection and emission color switching timing are the same as those already described with reference to FIG.

In the above description, the width W ₂₁ of the light source unit 21 has been described as being equal to the pitch of the scanning lines of the display panel 1, but the backlight unit can be obtained by setting the width to an integer multiple of 2 or more of the pitch. The configuration and production of 2 can be simplified.

If the width W ₂₁ of the light source unit 21 which is, for example, three times the value of the scan line pitch, will play an irradiation of about three scanning lines in which the light source unit 21 are continuous. In this case, for example, if the light source unit 21n is in charge of irradiation related to the nth to n + 2th scanning lines, the light source unit 21n continues for the corresponding color while the nth to n + 2th scanning lines are selected. To emit light. However, since the light from the light source unit 21n hits not only the position of the nth scanning line but also the positions of the (n + 1) th and n + 2th scanning lines when selecting the nth scanning line, In addition, erroneous light modulation is performed at the positions of the (n + 1) th and (n + 2) th scanning lines due to pixel information of a color different from that of the light from the light source unit 21n already written with respect to the (n + 2) th scanning line. Such erroneous light modulation is caused by the fact that the color of the irradiation light of the irradiation unit 21 of the backlight unit 2 is switched for every plurality of lines while the scanning line is selected for each line. In the example, it is one and two horizontal scanning periods for the (n + 1) th and (n + 2) th lines, respectively, but this is not preferable because it causes a reduction in the quality of the image to be displayed.

  Therefore, in order to eliminate such erroneous light modulation, after selecting all the scanning lines handled by one light source unit 21 and writing pixel information corresponding thereto, the emission color of the light source unit is switched. You can do it. In the case of the above example, the light emission switching of the light source unit 21n is performed after the selection of the three scanning lines from the nth to the (n + 2) th and the writing of pixel information are completed. FIG. 5 shows such an operation in the same manner as FIG.

  As can be seen from FIG. 5, the nth to n + 2th gate lines Gt-n, Gt-n + 1, and Gt-n + 2 that should exhibit red pixel information are sequentially selected for each horizontal scanning period. The red light irradiation switching G → R of Ln) in FIG. 5 is performed in the selection period Tn + 2 of the last gate line Gt−n + 2. The red light irradiation is turned on after the pixel information relating to the last gate line Gt-n + 2 is taken in based on the same purpose as described above. In addition, the first gate line Gt-n is selected so that unnecessary light modulation due to the transient state of the pixel or the like is not performed during capture of pixel information regarding the gate lines Gt-n, Gt-n + 1, and Gt-n + 2. Immediately before the start (before the gate signal Gt-n rises), light irradiation of all colors is stopped (Goff ′), and pixel information is captured in a non-irradiation state.

  In this way, light is not irradiated from the light source unit 21n (Ln) to the corresponding position until pixel information is written for all three scan lines from the nth to the (n + 2) th scan line. Then, the red light irradiation switching (Ron) of the irradiation unit 21n is performed for the first time after the writing of the last scanning line Gt−n + 2 that the irradiation unit 21n (Ln) takes charge, and the light modulation for the three scanning lines is performed. It will be started at the same time. As a result, it is possible to solve the problem of mismatch between the scanning line selection for each line and the irradiation color switching for each of the plurality of lines as described above (incorrect light modulation).

  Note that this aspect of the present example blocks the irradiation light of all colors during the scanning line writing (for example, the period from Goff ′ to Ron, see FIG. 5). This is accompanied by the action of a mask. When this state is drawn in the same manner as in FIG. 2, it is as shown in FIG.

  As can be seen from FIG. 6, in this example, three scanning lines are selected in each of the band-like spatiotemporal black matrices formed in the non-irradiated portion of the display panel, and writing of pixel information is completed (( (A) to (C1)), the irradiation unit of the corresponding backlight unit 2 switches the color of the irradiation light, and the progress of the spot light advances one step (C2). Immediately after the one-step movement of the spot light. The intended display of the pixel information of all the selected scanning lines is started. In FIG. 6, the size of the display screen is vertically long because of the space of the drawing and the like, but unlike the actual size, the scale is not uniform. This is the same in FIG. 2 and the following drawings.

  Returning to FIG. 4 again, the light emitted from the linear light source unit 21 diverges to some extent and enters the display panel 1. Therefore, the light spots emitted from the adjacent irradiating portions 21 that respectively bear the boundaries of the spot lights of different colors overlap each other at the edge portions and enter the display panel 1 in a mixed color form. Therefore, in the display panel 1, light of an undesired color different from the original red, green, and blue basic light is incident on the overlapping portions R * G, G * B, and B * R. Then, when the undesired color light is modulated by the pixel information written therein, unnecessary color light modulation relating to the display light is performed.

  In order to prevent this, it is preferable to form the above-mentioned spatiotemporal black matrix by turning off all the irradiating portions 21 that emit incident light that causes this overlap. As a result, in the example shown in FIG. 5 and FIG. 6, one of the upper and lower irradiating portions 21 corresponding to the boundary of the spot light of different colors is once turned off, and the overlap of the light spots of different colors is eliminated. The above-mentioned color mixing problem can also be avoided.

  On the other hand, depending on the configuration of the backlight unit employed, unlike the one shown in FIG. 4, each irradiation unit cannot turn off the irradiation light, and irradiation of light of any color is always selected. In some cases, it is impossible to form the spatiotemporal black matrix as described above. Alternatively, there is a case where an advantage is found in that the control of the backlight unit is simplified by not forming the spatiotemporal black matrix. In such a case, the display panel 1 inevitably has an overlapping portion of spot lights of different colors.

  Such an overlapping portion, that is, a mixed color portion can be prevented from affecting the display image as follows.

  FIG. 7 shows the same manner as FIG. 2, and shows an example of transition in the order of (A), (A2), (B), (B2), (C), (C2). ing.

  In FIG. 7A, the display panel 1 is controlled so that the nth, n + xth, and n + yth scanning lines corresponding to the irradiation positions of the red, green, and blue spot lights are sequentially selected. In this example, as described above, since these selected scanning lines are located on the forefront side of the spot light, they are located near the mixed color portion. Here, when the position of the mixed color portion on the panel is expressed with reference to the selected scanning line, the position of the n + qth, n + x + qth, and n + y + qth scanning lines can be obtained. q indicates the number of lines from the scanning line (n, n + x, n + y,...) selected for the original image display to the scanning line corresponding to the mixed color portion. In this example, the width of the mixed color portion is set to one scan line for simplicity.

  In the next stage, the n + qth, n + x + qth, and n + y + qth scanning lines corresponding to the mixed color portion are sequentially selected under the same spot light condition as in FIG. This state is shown in FIG. 7 (A2), and in response to these selections, pixel information from the source line is written into the pixels related to the selection line. The pixel information written here has the value (darkest pixel information) having the highest light blocking rate (for example, black). Thereby, since the light in the color mixture portion is blocked by the darkest pixel information of the display panel 1, it is possible to prevent the light of an unnecessary color from affecting the display. Thus, in the display panel 1, a spatiotemporal black mask can be formed to hide the color mixture portion that appears.

  After that, the spot light is shifted down by one step, corresponding to the selection of the (n + 1) -th, n + x + 1-th, n + y + 1-th scan lines and the writing of display pixel information (FIG. 7B) and the mixed color portion adjacent thereto. Selection of the n + 1 + qth, n + x + 1 + qth, and n + y + 1 + qth scan lines and writing of the darkest pixel information (FIG. 7 (B2)) are performed. Similarly, the shift of the spot light, the selection of the scanning line of the display target pixel, the writing of display pixel information, the selection of the scanning line corresponding to the mixed color portion, and the writing of the darkest pixel information are performed.

  FIG. 8 is a time chart showing FIG. 7, which follows the same manner as FIG. 3.

  As can be seen from FIG. 8, for the pixel Pn + q, m corresponding to the mixed color portion, the selection of the n + qth scanning line corresponding to the nth, n + xth, n + yth scanning lines and the writing of pixel information are performed. The darkest pixel information (bk) is written. Also at this time, the darkest pixel information is written in response to the rise of the corresponding gate signal Gt-n + q, as in the case of the scan line of the display target pixel. In this example, the n + q-th, n + x + q-th, and n + y + q-th scanning lines are the same as the n + 1-th, n + x + 1-th, and n + y + 1-th scanning lines (that is, q = 1), but they may not be the same. Of course. Here, the purpose is to explain that the darkest pixel information is written in the pixel corresponding to the color mixture portion.

In the process of shifting from (A2) to (B) in FIG. 7, immediately before the red pixel information Rn + 1 is written to the pixel Pn + 1 (see the section “Pn + q, m” in FIG. 8) related to the (n + 1) th scanning line. The color of the light applied to the pixel position is switched to red (see section “Lt−n + 1” and arrow t _{LS in} FIG. 8). This is to prevent the light of the color mixing portion (R * G) from being modulated by the red pixel information Rn + 1 of the pixel. That is, when switching from the cutoff state based on the darkest pixel information to the modulation state based on the normal display pixel information on the display panel, the irradiation light is first switched to a color corresponding to the normal display pixel information, and then the normal display pixel information is written. Is done. Similarly, immediately before the green and blue pixel information Gn + x + 1 and Bn + y + 1 are written to the pixels Pn + x + 1 and Pn + y + 1 related to the (n + x + 1) th and n + y + 1th scanning lines, the irradiation light is switched to the corresponding color at the corresponding position.

  Although not shown in this example, in a situation where the modulation state based on the normal display pixel information is switched to the cutoff state based on the darkest pixel information, the color mixture portion reaches the pixel on the scan line before reaching the pixel on the scan line. It is desirable to write dark pixel information. This is because when the darkest pixel information is written in the corresponding pixel after the color mixture portion arrives, the normal display pixel information written until that writing is completed until the completion of the writing, and from this information to the darkest pixel information. This is to prevent mixed color light from being transmitted in a transient modulation state until saturation.

  The form shown in FIG. 7 can also be realized by control other than that based on the time chart of FIG.

  FIG. 9 shows an example of such other control, which is drawn in the same manner as in FIG. As can be seen from FIG. 9, in the period corresponding to FIG. 7A2, the selection of the n + q-th, n + x + q-th and n + y + q-th scan lines corresponding to the mixed color portion and the capture of the darkest pixel information (bk) are simultaneously performed. One H / 3 period. Therefore, the gate signals Gt-n + q, Gt-n + x + q and Gt-n + y + q corresponding to these can be raised simultaneously. This is because it is sufficient to write the darkest pixel information (bk) of the same value for the pixels related to any scan line corresponding to the color mixture portion. Thus, the same pixel information is supplied.

  By doing in this way, it can be completed in a short time to form a black mask in such a color mixture portion. This also contributes to simplification of control of the gate driver 34 and the source driver 33.

  FIG. 10 shows another specific configuration example of the backlight unit, and the same reference numerals are given to the same parts as those in FIG.

  In FIG. 10, the backlight unit 2 'is composed of an array of light emitting diodes formed on a predetermined substrate 20', and red, green and blue from the upper end to the lower end of the panel 1 along the main surface of the substrate 20 '. The light emitting diodes 20R, 20G, and 20B are arranged in a stripe shape in this order. The irradiation unit 21 composed of the three color sets of light emitting diodes is formed for each scanning line or for each of the plurality of scanning lines, as in FIG. 4, and each diode and irradiation unit are parallel and longitudinal along the scanning line. It is formed.

  Between the backlight unit 2 ′ and the display panel 1, a light guide 2 a and a diffuser 2 b each having a main surface that covers at least the display area of the display panel 1 are disposed. The light guide 2a and the diffuser 2b shown in FIG. 10 are shown in a cross-sectional view like the backlight unit 2 ′. The light guide 2a has a prism array structure, collects light from the diode array, and guides it to the diffuser 2b. The diffuser 2b diffuses the light from the light guide 2a to equalize the light distribution mainly in the longitudinal direction of the scanning line and the direction orthogonal thereto, and to the display panel 1 using the diffused light as a longitudinal rectangular light spot. Lead. The light guide 2a can be omitted depending on the light distribution characteristics of the light emitting diode.

  FIG. 10 simply shows an irradiation mode of the light emitting diode in the same situation as that shown in FIG. 4, and shades the light emitting diodes 20R, 20G, and 20B that are turned off in the left sectional view. Is represented by. In this example, since the positions of the red, green, and blue light emitting diodes in one irradiation unit 21 are different, the light emission position on the display area in each irradiation unit 21 varies depending on the color of the spot light to be formed. Due to the light condensing and diffusing functions of the light guide 2a and the diffuser 2b, it is possible to absorb variations in the irradiation position on the display panel 1 due to this.

  Also in the backlight unit 2 ′ having the structure as shown in FIG. 10, the method of controlling each irradiation unit 21 is basically the same as that described in FIG. 4. 10 does not overlap the light emitting diode layer in the direction perpendicular to the main surface, most of the emitted light is irradiated without passing through the non-light emitting diode layer, and the light utilization efficiency is higher than that in FIG. There is an aspect that there is little loss.

  In addition, you may form the light-diffusion reflection film 203 or reflection film as shown in FIG. 4 for every irradiation part 21 or one surface in the back side of board | substrate 20 'in FIG. Further, a structure for preventing the light-emitting diodes 20R, 20G, and 20B from leaking a reflection film or other emitted light rays to other layers may be formed.

  As a modification of FIG. 4, a configuration as shown in FIG. 11 can be adopted.

  In FIG. 11, a groove 20 v having a V-shaped cross section is provided on the back surface of the substrate 20, and the bottom thereof faces the tip of the notch 202. Then, the light diffusion reflection film 203 is formed so as to fill the space in the groove 20v and cover the entire back surface of the substrate 20. Thereby, the light which arrived from the light emitting diodes 20R, 20G, and 20B to the back side is bounced back on the slope of the groove 20v and returned to the light emitting diode side. Therefore, the presence of the groove 20v can prevent light emitted from one irradiation unit 21 from leaking into the region of the other irradiation unit 21, and thus increase the independence of irradiation light for each irradiation unit. Therefore, effective use of light will be achieved. Further, as shown in FIG. 4, it is only necessary to form a single reflection layer on the entire back surface of the substrate 20 without forming the light diffusing reflection film 203 for each irradiation portion, which is advantageous in manufacturing. .

  This change as shown in FIG. 11 is also applicable to the configuration in FIG. That is, the structure shown in FIG. 11 may be formed on the substrate 20 ′ at the position where the irradiation unit 21 is separated as shown in FIG.

  FIG. 12 shows a configuration example of still another backlight unit.

  The configuration shown in FIG. 12 is not based on the surface irradiation means by the arrangement of a plurality of longitudinal light emitting sources as shown in FIG. 4 or FIG. 10, but the light is linearly emitted from the side of the display panel by a single light source. This has the concept of forming spot light that is distributed over the display area.

  Based on this idea, a light guide plate 2LG as light distribution conversion means for covering the display area is arranged on the back surface of the display panel 1, and as a backlight unit, a columnar shape having an irradiation area facing the side surface of the light guide plate 2LG. An illuminator 200 is arranged. This column illuminator 200 has a structure like a so-called barber pole, and is mainly a fixed cylindrical cold cathode fluorescent lamp (CCFL: Cold Cathode Fluorescent) arranged in parallel with one side of the light guide plate 2LG, for example, the left end face. Lamp) 25, a fixed reflecting plate 26 that is wound around and attached to the outside of the lamp 25 at a predetermined interval, and a translucent coloring drum 27 that is rotatably wound around the outside.

  The fluorescent tube 25 may be replaced with a hot cathode fluorescent lamp (HCFL), and a fluorescent light source of a type used as a white light source is used here, but a light source of another color is used. It is also possible to use. The axis of the fluorescent tube 25 is aligned with a straight line (center line) that bisects the end face of the light guide plate 2LG along its longitudinal direction. The reflection plate 26 is formed around the fluorescent tube 25 except for an exit region (irradiation surface) 26w that irradiates light, and reflects light from the fluorescent tube 25 as efficiently as possible on the irradiation surface. A shape having a general paraboloid for condensing light. The focal position of the paraboloid is aligned with the axis of the fluorescent tube 25 and the center line of the end face of the light guide plate 2LG.

  The coloring drum 27 is accompanied by a mechanism (not shown) that can rotate at a predetermined speed with the axis of the fluorescent tube 25 as a rotation axis. The light from the fluorescent tube 25 through the irradiation surface 26w defined by the opening of the reflection plate 26 is colored at the surface portion that appears outside the irradiation surface of the coloring drum 27 and introduced into the end surface of the light guide plate 2LG. The guided light is propagated in a planar manner mainly in the lateral direction of the display area of the display panel 1 in the light guide plate 2LG, and forms the strip-shaped spot light (2R, 2G, 2B) as described above in the display area. . Therefore, the end surface light that has passed through the irradiation surface 26w is converted into planar irradiation light that enters from the back surface of the display panel 1 and covers the display area. Although not shown in FIG. 12, between the columnar illuminator 200 and the light guide plate 2LG or between the light guide plate 2LG and the display panel 1, it is necessary for the conversion of the illumination light or for improving the efficiency. The optical member may be arranged.

  When the coloring drum 27 is rotated, the red, green, and blue spot lights (2R, 2G, 2B) continuously move from the top to the bottom of the display area in the display panel 1 as described above. Colored regions 27r, 27g, and 27b corresponding to each of these are formed. Each of these can be formed by a known colored film of a corresponding color. Here, the coloring regions 27r, 27g, and 27b of the coloring drum 27 are formed so that one cycle of the spot light movement pattern is completed on the display panel 1 when the coloring drum 27 rotates once. The colored regions 27r, 27g, and 27b of the drum 27 appear as the main portions of the shapes of diagonal bands of red, green, and blue when the surface of the drum is developed on a plane. Between the colored regions 27r, 27g, and 27b, a black region 2BK having a predetermined width is formed along these boundaries as necessary. As described above, this is to prevent mixed color irradiation of different colors of red, green and blue that may occur in the display panel 1 (that is, to form a black mask). The colored regions 27r, 27g, and 27b are respectively formed of corresponding red, green, and blue color filter films, and the color characteristics of the color filters can be appropriately changed according to the characteristics of the light emitted from the fluorescent lamp 26 to be applied. it can. As a standard at this time, it is normal that white color can be expressed when all colors are combined on the display panel, but it is not excluded to deliberately deviate from this standard.

  In such a configuration, when the coloring drum 27 rotates, the spot light irradiated on the display panel 1 moves according to the rotation. In order to ensure the reliability, it is preferable to control the rotation of the coloring drum 27 in synchronization with the selection of the scanning line. Although one rotation of the coloring drum 27 is not necessarily one cycle of the spot light movement pattern in the display panel 1, the spot light movement pattern in the display panel 1 is repeated without interruption by the continuous rotation of the coloring drum 27. It is necessary.

  The configuration of FIG. 12 is advantageous in that the spot light can be moved on the display panel 1 more smoothly than those of FIGS. 4 and 10. Further, since it is constituted by a single light source, there is an advantage that simple control is sufficient.

  FIG. 13 shows a configuration of a backlight unit of still another form.

  The configuration of FIG. 13 is based on the idea based on an optical stick body that covers one or more of the scanning lines of the display panel 1 as shown in the upper diagram. The optical stick body 40 employed has an outer shape based on a rectangular parallelepiped, and a V-shaped groove 4v is formed on the back surface side (the side opposite to the light irradiation side). This groove extends in a direction perpendicular to the longitudinal extension direction of the stick body, and is formed so that light entering from one end face of the stick body 40 is appropriately reflected on the inclined surface of the groove to the irradiation surface side as needed. Has been. A three-color light source 42 is provided on the side of the optical stick body 40 so as to face the end surface as a necessary optical system, and a convex lens 44 is provided as a condensing optical member between the optical stick body 40 and the light source 42. It has been. The light source 42 includes, for example, red, green, and blue light emitting diodes, and any one of them can be selectively turned on and driven to emit light.

  Briefly, when the light emitted from the light source 42 enters the optical stick body 40 via the condenser lens 44, a part of the light is reflected by the slope of the first-stage groove 4v, and the rest is the optical stick. After passing through the inside of the body, it is reflected by the slope of the second-stage groove 4v, and the remaining part is reflected by the third stage. It will be. Although FIG. 13 shows an example in which there are three grooves 4v, this number can be arbitrarily set. Further, it is possible to adopt a form in which a light source and a light condensing system are arranged on both sides as well as on one side of the optical stick body 40. In the configuration in which the light source is disposed only on one side of the optical stick body 40 as shown in FIG. 13, it is preferable to form a means for reflecting the internally propagated light on the opposite end face of the optical stick body 40. In this case, the light reflected by the end face can be expected to have the same effect as the above-described process on the slope of the groove 4v on the end face side, and the light use efficiency is improved. On the other hand, in the configuration in which the light source is disposed only on one side of the optical stick body 40, when the reflecting means is not provided on the opposite end surface, the side of the light source is not required even if it is not a V-shaped groove as shown in FIG. Only a structure having an inclined surface is required. Further, the function of the lens 44 may be provided inside each light emitting unit of the light source 42.

  A light pipe 400 as a light guide body assembly plate, which is shown in a plan view below FIG. In the light pipe 400, a partition layer 46 made of a material having high reflectivity or a refractive index lower than the refractive index of the optical stick 40 is formed between the optical stick bodies 40. The partition wall layer 46 can prevent light propagating inside the optical stick body 40 from entering another optical stick body 40. Therefore, the independence of light in the propagation path is established.

  On the side of the light pipe 400, the light source 42 and the condenser lens 44 as described above are arranged for each optical stick body 40. The control method for each light source 42 is based on the gist described in FIGS. The light pipe 400 is arranged on the back surface of the display panel 1 such that each irradiation surface of the optical stick body 40 faces the back surface of the display panel 1. The light propagated through the light pipe 400 is irradiated to the display panel 1 for each optical stick body 40.

  FIG. 14 shows a mode of manufacturing the light pipe 400.

  In FIG. 14, first, a high reflection thin film for forming the partition wall layer 46 or a thin film 46 ′ by a reflector made of a transparent resin having a low refractive index and a light transmittance for forming the optical stick body 40. Light guide layers 40 'made of extremely high resin or the like are alternately stacked on a manufacturing substrate (not shown). Preferably, the thin film 46 ′ is tacky to improve the bondability of each light guide layer. The light guide layer 40 'is overlaid as many times as necessary to cover the number of scanning lines of the display panel to be applied. After the stacking, necessary stabilization processing such as heating and drying is performed so as to obtain a stable structure.

  Next, the multilayer structure thus formed is cut to a predetermined thickness. Such cutting is performed so that a plane 40C parallel to the stacking direction of the thin film 46 'and the light guide layer 40' is the cut surface. Thereby, the original form of one light pipe 400 shown on the right of FIG. 14 is made. Thereafter, through the formation of the groove 4v and other necessary post-processes, the light pipe 400 having the structure shown in the lower part of FIG. 13 is completed. The groove 4v can be formed by, for example, grinding or emboss molding.

  In the method according to FIG. 14, if the multilayer structure is formed large, many light pipes 400 can be easily manufactured by repeating the cutting process.

  The light pipe formed in this way can be applied not only to the form shown in FIG. 13 but also to the form shown in FIG. 12 as a function of the light guide plate 2LG. Further, in the form shown in FIG. 4 and FIG. 10, the backlight unit 2 has a configuration (back light source type) based on an array of linear irradiation portions extending from one end to the other end of the display area. Instead of the linear irradiation part, a modification (side light source type) in which light is introduced from the side using a light guide over the display area as shown in FIG. 13 can be derived. As the light guide in the case of such a modification, the light pipe 400 described with reference to FIGS. 13 and 14 can be applied.

  In the example shown in FIG. 12, since the fluorescent tube 25 as a light source always emits light in the same driving state, the change in the power supply current is extremely small. As a result, power consumption with less noise and ripple is achieved, which is advantageous for stabilizing the power supply of the entire display device. This applies to the examples shown in FIGS. 4, 10, and 13. That is, in FIGS. 4, 10, and 13, most of the irradiating units are always in an operating state, and light of any color is always emitted from the irradiating units that are switched on and off. Since the overall power consumption change is small, the power supply is stabilized.

  In the above basic example, only three wide spot lights corresponding to red, green, and blue are formed on the display panel. However, the configuration is not necessarily limited to such spot lights. That is, the number of spot lights corresponding to red, green, and blue may be increased by narrowing the width. In this case, for example, as shown in FIG. 15 (when there are two spot lights for each of red, green, and blue), the display panel 1 is irradiated with spot lights and moved. The concept is the same as in the case of using three spot lights. More specifically, in the horizontal scanning period “H” shown in the time charts of FIG. 3, FIG. 5, FIG. 8, and FIG. Scan line selection and writing, and subsequent scanning line selection and writing corresponding to the red, green, and blue spot lights, a total of six scan line selections and pixel information writing in response to this are performed. Is called. Each time this period expires (FIGS. 3, 8, and 9), or every time pixel information relating to a predetermined scanning line in charge of the irradiating unit is written (FIG. 5), the spot light is moved by one step. Will be made. Therefore, as the number of spot lights irradiated to the display area increases, the number of times of writing pixel information to be performed within 1H increases, and the writing rate increases. Accordingly, the liquid crystal display panel is required to have a high response speed.

  Based on the basic configuration and operation described above, points unique to the present invention will be described below.

  FIGS. 16 and 17 are schematic diagrams showing such points, and show the relationship between the virtual area to be defined and the display area.

A virtual area (indicated by a broken line frame in the figure) 500 is for forming a sequence of spot lights to be presented in the display area of the panel 1. The virtual region 500 has more than the number of spot lights (eight in this example) presented in the display region 510 and at least n first to third colors (R, G, B) (n is 2 or more). , Each of the spot lights R ₁ , G ₁ , B ₁ , R ₂ , G ₂ , B ₂ ,... Repeatedly assigned in the order of the first to third colors. The movement from the beginning to the end is repeated. Rx, Gx, and Bx (x = 1, 2,..., 5 or no suffix) shown here represent colors assigned to the spot light as red, green, and blue, respectively. The state of such movement is as shown in (d) to (f) of FIG. 17 through an omission process in the middle from (a) to (c) of FIG. In addition, after (f) of FIG. 17, it becomes an aspect like FIG. 16 (a), and if it starts from the state of (a) of FIG. 16, it will return to the state of (a) of this FIG. 16 again. Thus, one cycle of spot light in the virtual region 500 is completed.

An effective range (indicated by a thick line frame) 510 of spot light to be formed in the display region is defined in the virtual region 500, and the spot light within the effective range is irradiated to the panel 1 as back light. For example, in FIG. 16A, eight spot lights R ₂ , G ₂ , B ₂ , R ₃ , G ₃ , B ₃ , R ₄ and G ₄ are incident on the panel 1. It should be noted here that, as in the basic example described above, it is not necessary to irradiate the display region with a set of R, G, and B spot lights as a unit. That is, as can be seen from FIG. 16 and FIG. 17, the proportion of the spot light of R, G, B in the display region varies depending on the movement of the spot light, and furthermore, the distribution of the spot light of R, G, B is not good. It is even. For example, in the situation of FIG. 16 (a), in the effective range 510, there are three spot lights for R and G, whereas the spot light for B occupies only two spots, but in the situation of FIG. The number of spot lights is three, and the number of spot lights B and G is 2.5. On the other hand, in the previous basic example, the R, G, and B spot lights in the display area are the same rate and do not change depending on the situation.

  As described above, when the virtual area 500 is used, the ratio and distribution of the spot light to be formed in the display area can be arbitrarily changed depending on the movement situation of the spot light. This means that not only the number of spot lights appearing on the screen can be increased, but also the movement pattern thereof is complicated, and thereby the effect of preventing color breakup can be further enhanced.

In the example of FIGS. 16 and 17, the number of spot lights in the virtual area is 15 and the number of spot lights in the display area is 8, but it is needless to say that the number is not limited thereto. As the minimum number, the number of spot lights in the display area is four. It is also one of the features of the present invention that this number is not limited to “3”, which is the number of basic colors as in the technique disclosed in Patent Document 2 above. When the number of spot lights in the display area is 4, the number of spot lights in the virtual area is a multiple of the number of basic colors exceeding 4 (3 in this example). Therefore, according to this point of the present invention, the display area is selected from the first to third spot lights of at least the first to third colors (R, G and B) and these colors. And presenting a fourth spot light of one or more colors (R, G and / or B). Here, the first to fourth spot lights mean first to fourth kinds (or types) of spot lights. Considering the example of FIGS. 16 and 17, for example, the first spot light indicates R ₂ and R ₃ , the second spot light indicates G ₂ and G ₃ , and the third spot light indicates B ₂ and B 3. ₃ and the fourth spot light indicates R ₄ and G ₄ .

  In FIG. 16 and FIG. 17, the virtual area 500 is occupied by light spots each having an integer number (5 in this example) of basic colors R, G, and B. The spot light need not be limited, and the R spot light, the G spot light, and the B spot light may not be the same number. The light spots formed in the virtual region 500 may be knitted so as to exhibit a predetermined reference color per unit time when the light spots appearing in the display region are combined. For example, in a form in which each light spot has a unique width as will be described later, although the number of light spots in the virtual region is different between R, G, and B, the width of the spot light that absorbs the difference is different. If the selected knitting system is used, the same color synthesizing operation as that of the light spot knitting system having the same width and the same number of R, G and B can be achieved. Such an organization with light spots of different widths makes it easier to eliminate optical noise that may appear in the display image than with an organization with light spots of equal width.

  The virtual area referred to here does not necessarily have to be provided as a physical space such as a memory in the backlight driver 41 or the like. In the control of the backlight, it is sufficient if there is a concept recognized as such a virtual area.

  Further, even when the movement control of the spot light using the virtual area is performed as described above, the spot light presented in the display area and the pixel for the panel 1 in accordance with the movement are similar to the case of the basic example described above. Driving is performed. In addition, the above-described configuration and control of the backlight system applied thereto can be applied. Therefore, the aspect of the pixel driving and backlight system in this case is left to the above description.

  The greater the number of spotlights irradiated to the display area, the more advantageous in terms of preventing so-called color breakage and in terms of moving image display performance. This is because the number of colors that appear in the display area per unit time is so large that the user's viewing ability can be far exceeded.

  In the above examples, the red, green, and blue spot lights are described as having the same width. However, these may have different intrinsic widths. For example, when it is better to suppress green than blue and red rather than green in terms of the color balance of the obtained image due to the relationship of the light intensity of each color obtained from the backlight unit, for example, as shown in FIG. As described above, it is preferable to reduce the width of the spot light that is green rather than blue and red than green. In this case, when focusing on one pixel, the pixel information holding time in one frame period of the pixel is shorter in green display than blue display and in red display than green display. As a result, the density of the display color can be varied in the order of blue, green, and red in the resulting image. Here, the density of the display color is a balance in the order of blue, green, and red, but the width may be set differently to have another color balance form. In addition, the setting of the width can be made variable regardless of whether it is performed automatically or intentionally.

  FIG. 18 also shows a driving pattern in the display panel in FIG. It should be noted here that when the display panel is irradiated with spot light as shown in (A), the display panel includes pixels related to the scanning line at the position corresponding to the color mixture portion in the spot light as shown in (B). When driving with the darkest pixel information and displaying black, the range of the scanning line to be displayed in black is sufficiently larger than the width of the color mixture portion. By doing so, it is preferable that slight light leakage from the color mixture portion can be hidden from the display.

  FIG. 19 shows a configuration of pixels and matrix electrodes of a display panel according to a modified example. This configuration is intended to simplify the control of the gate driver 34 and the source driver 33 than in the above example.

In FIG. 19, three gate lines G1 _R , G1 _G , G1 _B ,... For red, green, and blue are arranged for each pixel row, and three red, green, and blue gate lines are provided for each pixel column. Source lines S1 _R , S1 _G , S1 _B ,... Are arranged. Three TFTs for red, green, and blue are assigned to one pixel electrode, the gate electrodes of these TFTs are connected to the respective gate lines, and the source electrodes are connected to the respective source electrodes. All the drains of the TFTs are connected to the corresponding pixel electrodes.

Now, for example, in the situation shown in FIG. 2A, the nth scanning line to be selected is a row corresponding to the gate lines G2 _R , G2 _G , G2 _B , and the n + xth scanning line is the gate line Gm2. _If the n + y-th scanning line is a line corresponding to the gate lines Gz2 _R , Gz2 _G , and Gz2 _B , the color corresponding to the pixel information to be displayed among these gate lines is _R , Gm2 _G , Gm2 _B. The corresponding gate line G2 _R , gate line Gm2 _G , and gate line Gz2 _B are simultaneously selected. This simultaneous selection is performed by supplying gate signals that become active at the same timing to these gate lines. The TFT connected to the selected gate line is turned on, and the pixel information signal from the source line is supplied to the turned-on TFT. The TFT connected to the gate line G2 _R is supplied with red pixel information signals from the source lines S1 _R , S2 _R , S3 _R ,..., And the TFT connected to the gate line Gm2 _G is connected to the source lines S1 _G , S2 _G, S3 _G, ... green pixel information signals are supplied from, TFT connected to the gate line Gz2 _B, the source line _{S1 B, S2 B, S3 B} , ... blue pixel information signals from the supply Is done. Pixel information signals for each color can be supplied simultaneously.

  In this way, when the spot light is three colors of red, green and blue, the selection of the three scanning lines for red, green and blue corresponding to the spot light is performed by one horizontal scanning as described above. It can be done at the same time rather than in time divisions. Therefore, it is possible to keep the pixel information update period as one horizontal scanning period, thereby avoiding speeding up of the gate line selection control and the source line pixel information supply control.

  The configuration shown in FIG. 19 is for the case where there are three spot lights of red, green, and blue, but the same concept can be applied to cases where the number of spot lights is larger than this. For example, in the case of forming two spot lights for each color as shown in FIG. 15, three gate lines of each color of the first group among those corresponding to the row to be selected are simultaneously selected and corresponding pixel information. After the signal is supplied, the control that the three gate lines of the respective colors of the remaining second group are simultaneously selected and the corresponding pixel information signal is supplied may be repeated. Alternatively, another set of red, green, and blue source lines may be increased to simultaneously select six gate lines and supply corresponding pixel information signals.

  Further, in order to avoid speeding up the gate line selection control and the source line pixel information supply control, the example shown in FIG. 18 is also dealt with by double gate lines and source lines as shown in FIG. be able to.

  As a further development of the configuration of FIG. 19, a gate line to be simultaneously selected can be connected in advance in hardware. Accordingly, there is an advantage that such a configuration can be realized without increasing the number of outputs of the gate driver 34.

  As the organization of the spot light, in the above description, the basic colors are limited to red, green, and blue. However, the present invention is not limited to these, and other colors may be added to some or all of these, It may be a combination of colors. As an example of a method of selecting a color, a basic color that becomes almost white when all are mixed can be adopted, but it is not always necessary to use white as a reference. For example, in order to increase the maximum expressible brightness, white, or any other color may be used as a basic color in addition to red, green, and blue.

  Moreover, it is not limited to the form in which red (R), green (G), and blue (B) spot lights appear in this order from the head scanning line side of the display area. For example, next to R, G, B, G, B, After R, further rearrange the colors so as to present B, R, and G, then return to the appearance of R, G, and B and repeat this, or the appearance pattern of R, G, and B May be more complex. In this case, the spot light appearance form may be basically such that the sum of all spot lights appearing in the display area in one frame of the image to be displayed or a predetermined unit display period is white, The reference color other than white may be intentionally used. In order to realize such a configuration, the configuration having the characteristics described in FIGS. 16 and 17 is extremely advantageous.

  Further, in the above description, the spot light is moved from the top to the bottom of the display area. However, the spot light may be moved from the bottom to the top, or may be moved from the bottom to the top and from the bottom to the top. You may combine suitably the movement form to.

  In the above example, a completely transmissive display panel has been described, but the present invention can also be applied to a so-called transflective display panel.

  Further, the present invention is not limited to the active matrix type, and basically the present invention can be applied to a passive matrix type.

  In each of the above embodiments, a liquid crystal display panel is used as the display panel. However, the present invention is not limited to this, and the present invention is applied to any display device having a transmissive configuration that modulates transmitted light to generate display light. Obviously it is possible.

  As mentioned above, although the typical Example by this invention was described, this invention is not limited to these, Those skilled in the art can find a various modification within the range of an attached claim.

1 is a block diagram showing a basic schematic configuration of a liquid crystal display device according to an embodiment of the present invention. The schematic diagram which shows the irradiation spot light from the backlight unit in the liquid crystal display device shown by FIG. 1, and the drive form of a display panel. 3 is a flowchart showing the operation of the liquid crystal display device corresponding to FIG. FIG. 2 is a cross-sectional view and a plan view showing an example of a configuration of a backlight unit applied to the liquid crystal display device shown in FIG. The flowchart which shows the operation | movement of the liquid crystal display device by another example. The schematic diagram which shows the irradiation spot light from the backlight unit corresponding to FIG. 5, and the drive form of a display panel. The schematic diagram which shows the irradiation spot light from the backlight unit in the liquid crystal display device by another example, and the drive form of a display panel. 8 is a flowchart showing the operation of the liquid crystal display device corresponding to FIG. The flowchart which shows the operation | movement by the other form of the liquid crystal display device corresponding to FIG. Sectional drawing and top view which show the structure of the backlight unit applied to the liquid crystal display device shown by FIG. 1, and the other example of the irradiation spot light. FIG. 5 is a schematic cross-sectional view showing a modification of the backlight unit shown in FIG. 4. Sectional drawing and top view which show the structure of the backlight unit applied to the liquid crystal display device shown by FIG. 1, and the further another example of the irradiation spot light. The perspective view and top view which show the structure of the backlight unit by another form applied to the liquid crystal display device shown by FIG. Schematic which shows the manufacturing method of the light pipe used for FIG. The schematic diagram which shows the irradiation spot light from the backlight unit in the liquid crystal display device by a modification, and the drive form of a display panel. FIG. 4 is a schematic diagram for explaining a configuration of unique features and a part of a typical operation in the liquid crystal display device according to the embodiment of the present invention. FIG. 3 is a schematic diagram for explaining a configuration of a unique feature and a subsequent part of a typical operation in a liquid crystal display device according to an embodiment of the present invention. The schematic diagram which shows the irradiation spot light from the backlight unit and the drive form of a display panel in the liquid crystal display device by the other modification of this invention. Schematic which shows the structure of the pixel and matrix electrode of a display panel by the modification of this invention.

Explanation of symbols

1 ... Display panel 11 ... Back substrate 12 ... TFT
DESCRIPTION OF SYMBOLS 13 ... Pixel electrode 14 ... Front substrate 15 ... Common electrode 2, 2 '... Backlight unit 2R, 2G, 2B ... Spot light 20, 20' ... Substrate 21 ... Irradiation part 201 ... Concave section groove 20R, 20G, 20B ... Light emission Diode 202 ... Notch 203 ... Light diffuse reflection film 2a ... Light guide 2b ... Diffuser 20v ... Groove 2LG ... Light guide plate 200 ... Columnar illuminator 25 ... Fluorescent tube 26 ... Reflection plate 26w ... Irradiation surface 27 ... Colored drums 27r, 27g, 27b ... Colored area 2BK ... Black area 31 ... Buffer memory 32 ... Image memory 33 ... Source driver 34 ... Gate driver 35 ... Voltage generation circuit 41 ... Backlight driver 51 ... Timing controller 40 ... Optical stick body 4v ... V-shaped groove 42 ... three-color light source 44 ... condensing lens 400 ... light pipe 500 ... virtual area 510 ... effective range

Claims (24)

A display method using a transmissive matrix display panel in which a plurality of row electrodes and a plurality of column electrodes are arranged and pixels are driven based on signals supplied to the row electrodes and the column electrodes,
At least first to third color band-shaped spot lights formed along the row electrodes are individually generated, and these spot lights are perpendicular to the longitudinal extension direction of the row electrodes on the display area of the display panel. A backlight system that irradiates the display panel with the spot light as back light while being moved is used, and at least the first to third spot lights of each of the first to third colors and the at least first light are applied to the display area. Or each of the spot lights repeatedly moving from one end of the display region to the other end relative to the fourth spot light with one or more colors selected from the third colors.
For each spot light, an addressing operation for selecting a row electrode associated with a pixel corresponding to a specific irradiation position within the spot light irradiation range in the display region or a specific boundary adjacent position outside the spot light irradiation range. Repeat according to the movement of the spot light,
Providing a pixel information signal relating to the color of the spotlight that is or is to be illuminated at the position of the pixel to the column electrode to drive the pixel associated with the selected row electrode in response to the addressing operation;
A virtual region for forming a sequence of spotlights to be presented in the display region is defined, and the virtual region has a number of first to third colors larger than the number of spotlights presented in the display region. Each of the assigned spot lights repeatedly moves from the start end to the end of the virtual area, an effective range of the spot light to be presented in the display area is defined in the virtual area, and the spot light within the effective range is the first to Used as the fourth spot light,
Display method.   The display method according to claim 1, wherein a black spot or other light transmission preventing spot is formed between one side and the other side of the spot light.   The display method according to claim 1, wherein the movement of the spot light and the addressing operation are synchronously controlled.   4. The display method according to claim 1, 2, or 3, wherein irradiation light to pixels associated with the selected one or more row electrodes after completion of the addressing operation and driving of the pixels by the pixel information signal. A display method in which movement of the spot light is performed by changing the color.   5. The display method according to claim 4, wherein the backlight system interrupts light irradiation to a pixel related to the selected row electrode during the addressing operation and the supply of the pixel information signal. Display method.   3. The display method according to claim 2, wherein the addressing operation and the supply of the pixel information signal are performed on a row electrode related to a pixel at a position where the light transmission prevention spot is formed.   The display method according to claim 1, wherein pixels corresponding to the overlapping portion or boundary of the spot light and / or a region in the vicinity thereof are driven by a predetermined pixel information signal capable of preventing light transmission.   8. The display method according to claim 7, wherein driving of pixels corresponding to the overlapping portion or boundary of spot light and / or a region in the vicinity thereof is performed by simultaneously selecting a plurality of row electrodes and the predetermined pixels for these selected row electrodes. A display method performed based on simultaneous supply of information signals.   9. The display method according to claim 1, wherein the first to third colors are red, green, and blue, or a predetermined color other than white or white when mixed. A display method, which is a basic color that can be exhibited.   The display method according to claim 1, wherein each of the spot lights has a unique width.   The display method according to claim 10, wherein at least one width of the spot light is variable.   The display method according to any one of claims 1 to 11, wherein at least one intensity of the spot light is variable.   The display method according to claim 7, wherein a range of pixels driven by the predetermined pixel information signal corresponds to a color mixture portion generated around a boundary portion of the spot light and is equal to or larger than a width of the color mixture portion. A display method having a width.   The display method according to claim 1, wherein the spot lights are moved substantially simultaneously or sequentially on the display area.   15. The display method according to claim 1, wherein one cycle of movement of the spot light on the display area corresponds to one frame period of an image to be displayed.   16. The backlight system used in the display method according to claim 1, wherein a plurality of linear irradiation units that selectively irradiate light of the first to third colors is the backlight system. It has a configuration that extends along the row electrode and is arranged over the display region, and the irradiation unit next to the irradiation unit corresponding to the forefront of the spot light emits light of the color of the spot light. A backlight system that moves the spot light by switching control.   A backlight system used in the display method according to any one of claims 1 to 15, wherein a linear light source, a reflector for condensing light from the light source on a linear irradiation surface, and Coloring means capable of moving the colored film so as to pass the colored film above the irradiated surface, and planar distribution of the linear light guided from the irradiated surface and transmitted through the colored film The colored film has a pattern on which the first to third colors of light are formed, and on the irradiation surface of the colored film in the coloring means. A backlight system in which movement of the spot light in the display area is performed by a passing operation of the light.   18. The backlight system according to claim 17, wherein the colored film has a colored region corresponding to each of the first to third colors, and a light blocking region formed at a joint portion between the colored regions. , Backlight system.   The backlight system according to claim 17, wherein the coloring unit is provided so as to surround the linear light source, is rotated around a predetermined central axis, and the colored film is formed on a surface portion. A backlight system that is a coloring drum.   16. A backlight system for use in a display method as claimed in any one of claims 1 to 15, wherein the light system extends along the row electrode with a width that can overlap a pixel associated with at least one row electrode. A plurality of light body parts arranged side by side over the display area, and the first to third colors on the end face of the light guide part in the light guide part assembly plate, respectively. An optical system that selectively enters the light of the spot light, and the optical system next to the optical system corresponding to the forefront of the spot light is switched and controlled so as to emit light of the color of the spot light. A backlight system that moves the spotlight.   21. The backlight system according to claim 20, wherein the light guide body portion extends in a direction orthogonal to a longitudinal extension direction thereof and reflects light from the optical system so as to be directed to the display area. A backlight system having a groove having an inclined surface and other reflecting structures.   The backlight system according to claim 20 or 21, wherein a light reflectivity or a refractive index lower than a refractive index of the light guide part is provided between the light guide parts in the light guide part assembly plate. A backlight system provided with a partition layer made of a material having the same.   23. The backlight system according to claim 20, 21 or 22, wherein a condensing optical member is provided between the optical system and an end surface of the light guide body. A display device using the backlight system according to any one of claims 16 to 23.