JP2019045704A - Liquid crystal display device - Google Patents

Abstract

To provide a liquid crystal display device capable of suppressing degradation of display quality and achieving a reduction in cost.SOLUTION: A liquid crystal display device of the present invention includes a plurality of pixel electrodes arranged in a matrix, a plurality of scanning signals 3, 4 extending in a row direction between the pixel electrodes, a plurality of image signal lines 5 extending in a column direction between the pixel electrodes and disposed every two columns, and a light-shielding layer 22 disposed on each pixel electrode and in the row direction and the column direction between the pixel electrodes in a plan view. Each pixel electrode has a reflection regional portion 18 reflecting light and a transmission regional portion 19 transmitting light, juxtaposed in the column direction. The light-shielding layer 22 has a light-shielding regional portion 23 overlapping with the image signal line 5 in the plan view, and a light-shielding regional portion 24 in the column direction and not overlapping with the image signal line 5 in the plan view. A width of the light-shielding regional portion 24 between the reflection regional portions 18 of the pixel electrodes is smaller than a width of the light-shielding regional portion 23 between the transmission regional portions 19 of the pixel electrodes.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a liquid crystal display device, and more particularly to a double scanning line type transflective liquid crystal display device.

  As one of liquid crystal display devices, there is a transflective liquid crystal display device including a reflective region portion that reflects light and a transmissive region portion that transmits light in one pixel in order to improve outdoor visibility. . As a technique applicable to a liquid crystal display device, there is a technique called a double scanning line method (see, for example, Patent Document 1). The double scanning line type liquid crystal display device sandwiches a plurality of pixels arranged in a matrix, a video signal line extending in the column direction every two pixels, and each pixel arranged in the row direction. And two scanning signal lines extending in the row direction, and the pixels arranged in the row direction are alternately connected to different scanning signal lines. With such a configuration, in the double scanning line type liquid crystal display device, two pixels are arranged for one video signal line, so the number of video signal lines per pixel is halved. In addition, the number of components such as an IC (Integrated Circuit) chip that supplies a signal to the video signal line can be reduced. Therefore, the cost of the entire liquid crystal display device can be reduced.

  In the double scanning line type liquid crystal display device, since two pixels are arranged for one video signal line, there is a region where no video signal line is arranged between adjacent pixels. In this region, it is not necessary to block light leakage from the liquid crystal layer due to electric field leakage generated near the video signal line or liquid crystal alignment failure. Therefore, the width of the light shielding layer arranged corresponding to the area where the video signal line is not extended between the adjacent pixels is arranged corresponding to the area where the video signal line is extended between the adjacent pixels. It tends to be smaller than the width of the light shielding layer. However, in such a configuration, there is a problem that bright and dark stripes are visually recognized in the column direction.

  As countermeasures for the above problems, conventionally, the width of the light-shielding layer disposed corresponding to the region where the video signal line extends between the adjacent pixels, and the video signal line extends between the adjacent pixels. The structure which makes the width | variety of the light shielding layer arrange | positioned corresponding to the area | region which does not exist the same is disclosed (for example, refer patent document 2).

JP 2007-219524 A JP 2006-79104 A

  In Patent Document 2, a region where no video signal line extends between adjacent pixels is shielded more than necessary by a light shielding layer disposed corresponding to the region. Therefore, when the technique of Patent Document 2 is applied to a transflective liquid crystal display device, the aperture ratio of the reflective region portion and the transmissive region portion in the pixel is lowered, so that the reflectance of the reflective region portion is reduced and the transmissive region portion is There is a problem that the transmittance of the liquid crystal decreases. That is, there is a problem that display quality is lowered. In addition, when the opening area of the light shielding layer corresponding to the reflection area portion is increased so that the reflectance of the reflection area portion does not decrease, the opening area of the light shielding layer corresponding to the transmission area portion decreases accordingly, and the transmission area The brightness of the part decreases. In order to prevent the decrease in the luminance, it is necessary to increase the luminance of the backlight. For this purpose, it is necessary to increase the number of LEDs (Light Emitting Diodes) serving as the backlight or increase the power consumption of the backlight. This leads to an increase in cost of the liquid crystal display device and increases power consumption, which is contrary to energy saving.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a liquid crystal display device capable of reducing the cost by suppressing the deterioration of display quality.

  In order to solve the above problems, a liquid crystal display device according to the present invention includes a plurality of pixel electrodes arranged in a matrix, a plurality of scanning signal lines extending in the row direction between the pixel electrodes, and each pixel. A plurality of video signal lines extending in every two columns in the column direction between the electrodes, and a light shielding layer disposed on each pixel electrode in a row direction and a column direction between the pixel electrodes in plan view Each pixel electrode includes a reflective region portion that reflects light and a transmissive region portion that transmits light, which are arranged side by side in the column direction, and the light shielding layer includes a video signal line in plan view. The first light-shielding region portion that overlaps and the second light-shielding region portion that is in the column direction and does not overlap the video signal line in plan view, and the width of the second light-shielding region portion between the reflective region portions of each pixel electrode is The width is smaller than the width of the first light shielding region between the transmissive regions of each pixel electrode.

  According to the present invention, the liquid crystal display device includes a plurality of pixel electrodes arranged in a matrix, a plurality of scanning signal lines extending in the row direction between the pixel electrodes, and a column direction between the pixel electrodes. Each pixel electrode including a plurality of video signal lines extending every two columns and a light shielding layer on each pixel electrode and arranged in a row direction and a column direction between the pixel electrodes in a plan view. Includes a reflective region portion that reflects light and a transmissive region portion that transmits light, and the light shielding layer is a first light shielding region portion that overlaps the video signal line in plan view. And a second light-shielding region that is in the column direction and does not overlap with the video signal line in plan view, and the width of the second light-shielding region between the reflective regions of each pixel electrode is the transmission region of each pixel electrode Since it is smaller than the width of the first light-shielding area between the parts, the deterioration of display quality is suppressed and the Theft of it is possible.

It is a top view which shows an example of the whole structure of the liquid crystal display device by Embodiment 1 of this invention. It is a top view which shows an example of a structure of the array substrate by Embodiment 1 of this invention. It is a top view which shows an example of a structure of the light shielding layer by Embodiment 1 of this invention. It is a figure which shows the A1-A2 cross section of FIG. It is a top view which shows an example of a structure of the light shielding layer by the modification of this Embodiment 1. FIG. It is a top view which shows an example of a structure of the array substrate by the modification of Embodiment 1 of this invention. It is a top view which shows an example of a structure of the array substrate by Embodiment 2 of this invention. It is a top view which shows an example of a structure of the light shielding layer by Embodiment 2 of this invention. It is a figure which shows the B1-B2 cross section of FIG. It is a top view which shows an example of a structure of the light shielding layer by the modification of Embodiment 2 of this invention. It is a figure which shows an example of a structure of the liquid crystal display device by a base technology. It is a top view which shows an example of a structure of the light shielding layer by a prerequisite technique.

  Embodiments of the present invention will be described below with reference to the drawings.

<Prerequisite technology>
A prerequisite technology that is a prerequisite technology of the present invention will be described.

  FIG. 11 is a diagram showing an example of the configuration of the liquid crystal display device according to the base technology, and more specifically, a schematic circuit diagram of the configuration of a semi-transmission liquid crystal display device of a double scanning line system. FIG. 11 shows a part of the transflective liquid crystal display device.

  As shown in FIG. 11, R (red), G (green), and B (blue) pixels are arranged in a matrix. The scanning signal lines 3 and 4 extend in the row direction so as to sandwich a plurality of pixels arranged in the row direction which is the x direction. The video signal line 5 extends in the column direction which is the y direction every two pixels. The pixel electrode of each pixel has a reflective region portion 18 and a transmissive region portion 19 provided side by side in the column direction.

  A TFT (Thin Film Transistor) 6 is disposed in each pixel, a gate electrode is connected to the scanning signal line 3 or the scanning signal line 4, a source electrode is connected to the video signal line 5, and a drain electrode is connected to the pixel electrode. It is connected. When attention is paid to two pixels arranged with the video signal line 5 interposed therebetween, the source electrode of the TFT 6 of each pixel is connected to the common video signal line 5, and the gate electrode of the TFT 6 of each pixel is different from each other. , 4 are connected. That is, the gate electrodes of the TFTs 6 of the respective pixels arranged in the row direction are alternately connected to the scanning signal lines 3 and 4.

  FIG. 12 is a plan view showing an example of the configuration of the light shielding layers 31 and 34. FIG. 12A shows a pattern of the light shielding layer 31 in which the width of the light shielding region portion 33 is smaller than the width of the light shielding region portion 32. FIG. 12B shows a pattern of the light shielding layer 34 in which the width of the light shielding region 35 and the width of the light shielding region 36 are the same.

  As shown in FIG. 12A, the light shielding layer 31 has an opening at a position corresponding to each pixel shown in FIG. The light shielding region portion 32 which is a part of the light shielding layer 31 is disposed corresponding to a region where the video signal line 5 is extended between adjacent pixels. The light shielding region portion 33 which is a part of the light shielding layer 31 is disposed corresponding to a region where the video signal line 5 is not extended between adjacent pixels. In addition, the dashed-dotted line shown to Fig.12 (a) is a centerline which passes the center of the opening part of the light shielding layer 31 in a column direction. The width L1 is the distance between the center lines of the openings adjacent to each other with the light shielding region 33 interposed therebetween. The width L2 is the interval between the center lines of the openings adjacent to each other with the light shielding region 32 interposed therebetween.

  As shown in FIG. 12B, the light shielding layer 34 has an opening at a position corresponding to each pixel shown in FIG. The light shielding region portion 35 which is a part of the light shielding layer 34 is disposed corresponding to a region where the video signal line 5 is extended between adjacent pixels. The light shielding region portion 36 which is a part of the light shielding layer 34 is disposed corresponding to a region where the video signal line 5 is not extended between adjacent pixels. In addition, the broken line shown in FIG.12 (b) is a centerline which passes the center of the opening part of the light shielding layer 34 in a column direction. The width L3 is an interval between the center lines of the openings adjacent to each other with the light shielding region 35 or the light shielding region 36 interposed therebetween.

  In the pattern of the light shielding layer 34 shown in FIG. 12B, since the openings of the light shielding layer 34 are equally spaced with a width L3, bright and dark stripes are not visually recognized in the column direction. On the other hand, in the pattern of the light shielding layer 31 shown in FIG. 12A, the width between the openings of the light shielding layer 31 is different from the width L1 and the width L2. Therefore, compared to the pattern of the light shielding layer 34 shown in FIG. 12B, the center line of the opening is shifted in the direction of the region where the video signal line 5 is not extended between adjacent pixels. As a result, bright and dark stripes are visually recognized in the column direction.

  Note that the center line passing through the center of the opening of the light shielding layer 31 in the column direction or whether the center line passing through the center of the opening of the light shielding layer 34 in the column direction is related to whether or not the above-described bright and dark stripes are visible. As for the position, when the opening of the light shielding layer 31 or the opening of the light shielding layer 34 is not rectangular, the center of gravity of these openings is read as the center of the opening, and the center passing through the center of the opening in the column direction. What is necessary is just to interpret as a line, and it becomes the same relationship about whether a light and dark streak is visually recognized.

  As described above, in order to prevent the bright and dark stripes visually recognized in the column direction, a light shielding layer pattern as shown in FIG. However, such a light shielding layer pattern has a problem that the display quality is deteriorated because light is shielded more than necessary. There is also a problem such as cost increase. The present invention has been made to solve such problems, and will be described in detail below.

<Embodiment 1>
FIG. 1 is a plan view showing an example of the overall configuration of a liquid crystal display device according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing an example of the configuration of the array substrate 1. FIG. 3 is a plan view showing an example of the configuration of the light shielding layer 22. FIG. 4 is a view showing a cross section taken along line A1-A2 of FIGS. In the following description, it is assumed that the liquid crystal display device according to the first embodiment is a double-transmission line type transflective liquid crystal display device. FIG. 2 shows a part of the array substrate 1.

  As shown in FIG. 1, the liquid crystal display device according to the first embodiment includes an array substrate 1, a color filter substrate 2, a liquid crystal layer 7, and a sealing material 8. These constitute a liquid crystal display panel.

  The array substrate 1 includes a plurality of pixel electrodes arranged in a matrix, a plurality of scanning signal lines 3 and 4 extending in a row direction between the pixel electrodes, and a column direction between the pixel electrodes. A plurality of video signal lines 5 extending for each column and TFTs 6 disposed on the respective pixel electrodes are provided. Since these configurations are the same as the configurations shown in FIG. 11 already described, detailed description thereof is omitted here. Each pixel electrode is arranged corresponding to each pixel of R, G, and B shown in FIG. As shown in FIG. 2, the pixel electrode includes a reflective pixel electrode 20 and a transmissive pixel electrode 21 and is connected to the TFT 6. The region where the reflective pixel electrode 20 is formed corresponds to the reflective region portion 18 described above. The region where the transmissive pixel electrode 21 is formed corresponds to the transmissive region portion 19 described above.

  The reflective pixel electrode 20 and the transmissive pixel electrode 21 may have a known configuration. For example, the transmissive pixel electrode 21 may be formed of a single layer of a general transparent conductive film such as an ITO (Indium Tin Oxide) film. In addition, the reflective pixel electrode 20 may be composed of, for example, a single layer of an Al film serving as a general reflective electrode film, or a multilayer having an Al film as a surface layer and a contact layer such as Mo as a lower layer. As shown in FIG. 4, the first embodiment has a configuration in which a transmissive pixel electrode 21 is disposed below the reflective pixel electrode 20 in the reflective region 18.

  The color filter substrate 2 includes a color filter (not shown) and is disposed to face the array substrate 1. The sealing material 8 is provided between the array substrate 1 and the color filter substrate 2. The liquid crystal layer 7 is sealed in a gap surrounded by the array substrate 1, the color filter substrate 2, and the sealing material 8. The area where the liquid crystal layer 7 exists corresponds to the display area 9.

  The outer shape of the array substrate 1 is larger than the outer shape of the color filter substrate 2, and a part of the array substrate 1 protrudes from the end of the color filter substrate 2 in plan view. Drive IC chips 10 and 11 and signal terminals 12 and 13 are arranged on the protrusions. The driving IC chips 10 and 11 are connected to the scanning signal lines 3 and 4 and the video signal line 5 in order to supply a signal to each TFT 6.

  The signal terminal 12 is connected to the control board 15 via an FFC (Flexible Flat Cable) 14 that is a connection wiring. The signal terminal 12 is also connected to the driving IC chip 10. The control board 15 includes a control IC chip that generates a control signal for controlling the drive IC chip 10 and the like. The control signal output from the control board 15 is input to the drive IC chip 10 via the FFC 14 and the signal terminal 12. The driving IC chip 10 generates and outputs an output signal that is a video signal or a scanning signal based on the control signal input from the control board 15. The output signal output from the drive IC chip 10 is supplied to the TFT 6 through a plurality of signal lead-out wirings (not shown).

  The signal terminal 13 is connected to the control board 17 via the FFC 16. The signal terminal 13 is also connected to the driving IC chip 11. The control board 17 includes a control IC chip that generates a control signal for controlling the drive IC chip 11 and the like. The control signal output from the control board 17 is input to the drive IC chip 11 via the FFC 16 and the signal terminal 13. The driving IC chip 11 generates and outputs an output signal that is a video signal or a scanning signal based on the control signal input from the control board 17. The output signal output from the drive IC chip 11 is supplied to the TFT 6 through a plurality of signal lead-out wirings (not shown).

  As described above, the liquid crystal display device according to the first embodiment uses the double scanning line method. Accordingly, since the number of video signal lines 5 is halved compared to a liquid crystal display device that does not use the double scanning line method, the number of drive IC chips that supply video signals to the video signal lines also does not use the double scanning line method. Compared to liquid crystal display devices, it is halved.

  As shown in FIGS. 2 and 4, in the array substrate 1, the video signal line 5 and the pixel electrode composed of the reflective pixel electrode 20 and the transmissive pixel electrode 21 are arranged apart from each other without overlapping in a plan view.

  As shown in FIGS. 3 and 4, the color filter substrate 2 is provided with a light shielding layer 22 so as to overlap the scanning signal lines 3 and 4, the video signal line 5, and the TFT 6 provided on the array substrate 1 in plan view. Has been. The light shielding layer 22 is disposed to shield light leakage from the liquid crystal layer due to electric field leakage generated near the video signal line 5 or liquid crystal alignment failure, and is also referred to as a black mask or a black matrix. The light shielding region portion 23 that is the first light shielding region portion is a portion of the light shielding layer 22 that overlaps the video signal line 5 in plan view. The light shielding area 24 that is the second light shielding area is a portion of the light shielding layer 22 that is in the column direction and does not overlap with the video signal line 5 in plan view. The light shielding layer 22 is formed of, for example, a metal layer using chromium oxide or the like, or a black resin layer in which a carbon black pigment or a titanium black pigment is dispersed in a photosensitive resin, a so-called resin black matrix. Yes.

  Further, the color filter substrate 2 is a photosensitive resin in which pigments or dyes corresponding to, for example, three primary colors of R, G, and B are formed in each region of the light shielding layer 22 surrounded by the light shielding region portions 23 and 24. A colored layer 27 made of a transparent resin layer dispersed in is formed.

  A step forming film 28 is formed in the reflective region 18 so as to cover the light shielding regions 23 and 24 and the colored layer 27. The step forming film 28 is formed in order to adjust the thickness of the liquid crystal layer 7 in the reflective region 18 so as to be about half the thickness of the liquid crystal layer 7 in the transmissive region 19. In the example of FIG. 4, the step forming film 28 is formed on the color filter substrate 2, but is not limited thereto. For example, the step forming film 28 may be formed only on the array substrate 1, or may be formed on both the array substrate 1 and the color filter substrate 2.

  Further, the color filter substrate 2 is provided with a counter electrode (not shown) made of a transparent conductive film such as ITO on substantially the entire display area 9. The counter electrode is provided to drive the liquid crystal of the liquid crystal layer 7 by generating an electric field between the pixel electrode of the array substrate 1 and the transfer electrode provided on the array substrate 1 side via a transfer material. Electrically connected. A signal input from the outside is transmitted to the counter electrode through the transfer electrode and the transfer material.

  In the color filter substrate 2, columnar spacers (not shown) are formed in order to control the thickness of the liquid crystal layer 7 existing between the array substrate 1 and the color filter substrate 2.

  As shown in FIG. 3, the light shielding layer 22 forms openings in regions corresponding to the reflective pixel electrode 20 and the transmissive pixel electrode 21 of each pixel. In FIG. 2, the opening of the light shielding layer 22 is indicated by a broken line.

  Next, a configuration that is a feature of the liquid crystal display device according to the first embodiment will be described.

  As shown in FIG. 3, the width W of the light shielding region 23 and the width W of the light shielding region 24 are the same in the transmissive region 19. The width W takes into account a shift when the light shielding region portion 23 is aligned when the liquid crystal of the liquid crystal layer 7 cannot perform a desired display operation due to electric field leakage generated in the vicinity of the video signal line 5. What is necessary is just to set to the width | variety which can be light-shielded, and the width | variety of the light-shielding area | region part 24 should just be set so that it may become the same width W as the width W of the light-shielding area | region part 23 set at this time. On the other hand, in the reflection region 18, the width W 1 of the light shielding region 24 is set smaller than the width W 2 of the light shielding region 23.

  In addition, the light shielding region portion 23 is different in the width W in the transmission region portion 19 and the width W2 in the reflection region portion 18. This is because the transmission area 19 and the reflection area 18 have slightly different widths necessary for shielding light in the vicinity of the video signal line 5. The width W and the width W2 may be set to different minimum necessary widths, or may have the same width for the convenience of design because the difference in width necessary for light shielding is small. In the example of FIG. 3, the width W and the width W2 are shown as the same width.

  From the above, according to the first embodiment, in the transmissive area portion 19, the width W of the light shielding area portion 23 and the width W of the light shielding area portion 24 are the same. Lines are not visible. On the other hand, in the reflection area 18, the width W1 of the light shielding area 24 is smaller than the width W2 of the light shielding area 23. Therefore, as described above with reference to FIG. There is a concern of being seen. However, since the visibility of bright and dark streaks in the reflective region 18 is low, the display quality does not deteriorate significantly. Further, in the reflection region portion 18, since the width W1 of the light shielding region portion 24 is smaller than the width W2 of the light shielding region portion 23, the area of the opening of the light shielding layer 22 corresponding to the reflection region portion 18 can be increased. In other words, since the aperture ratio of the reflection region portion 18 can be increased, the reflectance of the reflection region portion 18 can be improved. The increase in the aperture ratio of the reflective area portion 18 can contribute to the aperture ratio of the transmissive area portion 19, so that the number of LEDs serving as the backlight is reduced or the power consumption of the backlight is reduced to save energy. Can be achieved. Furthermore, since the liquid crystal display device according to the first embodiment is a double scanning line type transflective liquid crystal display, in addition to the above effects, the number of components can be reduced and the cost can be reduced. A synergistic effect is obtained.

  Note that the width W1 of the light shielding region 24 in the reflective region 18 is a minimum width necessary for preventing the colors corresponding to the adjacent pixels across the light shielding region 24 in plan view from being mixed. can do. In this case, since the aperture ratio of the reflection region portion 18 can be maximized, the reflectance of the reflection region portion 18 can be further improved.

<Modification>
In the above description, the case where the width W of the light shielding region 23 and the width W of the light shielding region 24 are the same in the transmissive region 19 as shown in FIG. 3 has been described. In this configuration, since the width W of the light shielding area 24 is matched to the width W of the light shielding area 23, the light shielding area 24 that shields light more than necessary has a useless area. Even if this useless area is used as the reflection area 18, the interval between the transmission areas 19 of adjacent pixels does not vary with the width W, so that the light and dark streaks in the column direction are not visually recognized in the transmission area 19. The aperture ratio of the reflection region 18 can be improved as compared with the configuration of FIG.

  Specifically, as shown in FIGS. 5 and 6, in the transmissive region 19, the width W of the light shielding region 23 is the same as the width W of the light shielding region 23 shown in FIG. 3, and the width of the light shielding region 24. W3 is set to be smaller than the width W of the light shielding area 23. In addition, the reflective pixel electrode 20 corresponding to each of the reflective region portions 18 that are adjacent to each other with the light shielding region portion 24 interposed therebetween extends along the light shielding region portion 24 in the transmissive region portion 19 and the side portion from the light shielding region portion 24 in plan view. It is provided to protrude. At this time, a width W obtained by combining the width of the light shielding region 24 and the width of the portion protruding from the light shielding region 24 of each reflective pixel electrode 20 is the same as the width W of the light shielding region 23. That is, the reflective region portion 18 of each pixel electrode adjacent to the light-shielding region portion 24 between the transmissive region portions 19 extends along the light-shielding region portion 24 between the transmissive region portions 19 toward the transmissive region portion 19 side. In addition, the boundary between the extended reflection region portion 18 and the transmission region portion 19 protrudes in plan view from the light shielding region portion 24 between the reflection region portions 18, and the width of the light shielding region portion 23 between the transmission region portions 19 is This distance is the same as the distance between the boundaries between the reflective region portions 18 and the transmissive region portions 19 adjacent to each other with the light shielding region portion 24 between the transmissive region portions 19.

  With the above configuration, since the interval between the transmissive region portions 19 between adjacent pixels is the width W, an effect that bright and dark streaks are not visually recognized at the time of transmissive display is obtained as in the configuration shown in FIG. In addition, since the area of the reflection area 18 is widened, the aperture ratio of the reflection area 18 can be further improved.

<Embodiment 2>
In the first embodiment, the case where the video signal line 5 and the pixel electrode including the reflective pixel electrode 20 and the transmissive pixel electrode 21 are arranged so as not to overlap each other in plan view has been described. In the second embodiment of the present invention, a case will be described in which the video signal line 5 and the pixel electrode composed of the reflective pixel electrode 20 and the transmissive pixel electrode 21 are arranged so as to overlap each other in plan view.

  FIG. 7 is a plan view showing an example of the configuration of the array substrate 1 according to the second embodiment of the present invention. FIG. 8 is a plan view illustrating an example of the configuration of the light shielding layer 22. FIG. 9 is a view showing a B1-B2 cross section of FIGS. In the following description, it is assumed that the liquid crystal display device according to the second embodiment is a double scanning line type transflective liquid crystal display device.

  As shown in FIGS. 7 and 9, the array substrate 1 is provided with a planarization film 30 so as to cover the video signal line 5. The planarization film 30 is an organic resin film having a thickness of about 1 μm to 3 μm, for example. The reflective pixel electrode 20 and the transmissive pixel electrode 21 are provided on the planarizing film 30 so as to overlap a part of the video signal line 5 in plan view. The pixel electrode composed of the reflective pixel electrode 20 and the transmissive pixel electrode 21 is connected to the TFT 6 through a pixel contact hole 29 provided by opening the planarizing film 30 in the vicinity of the TFT 6.

  Note that the planarizing film 30 may have a function of adjusting the thickness of the liquid crystal layer 7 in the reflective region 18 so as to be about half the thickness of the liquid crystal layer 7 in the transmissive region 19. In this case, the step forming film 28 is unnecessary. For example, the planarizing film 30 is removed by providing an opening or the like in the transmissive region portion 19. Further, the planarizing film 30 may be formed so as to cover the video signal line 5 in the reflective region 18 and not cover the video signal line 5 in the transmissive region 19. In this case, in the reflective region portion 18, only the reflective pixel electrode 20 can be provided on the planarizing film 30 so as to overlap a part of the video signal line 5 in plan view.

  Next, a configuration that characterizes the liquid crystal display device according to the second embodiment will be described.

  As shown in FIG. 9, the width W of the light shielding region 23 and the width W of the light shielding region 24 are the same in the transmissive region 19. Note that the width W of the light shielding area 23 can be set smaller than the width W of the light shielding area 23 in the transmission area 19 shown in FIG. As described above, the pixel electrode including the reflective pixel electrode 20 and the transmissive pixel electrode 21 is provided on the planarization film 30 so as to overlap with a part of the video signal line 5 in plan view. Accordingly, since the display operation by turning on and off the liquid crystal can be performed up to positions corresponding to both side ends of the video signal line 5 that are outside the range shielded by the video signal line 5, the light shielding region portion 23 in the transmissive region portion 19. The width W may be larger than the width of the video signal line 5 in consideration of a shift in plan view between the light shielding area 23 and the video signal line 5. As a result, the width W of the light shielding region 23 in the transmissive region 19 can be set smaller than the width W of the light shielding region 23 in the transmissive region 19 shown in FIG. In accordance with this, the width W of the light shielding region 24 in the transmissive region 19 can also be set small.

  On the other hand, in the reflective region 18, the reflective pixel electrode 20 is provided on the planarizing film 30 so as to overlap a part of the video signal line 5 in plan view. In particular, in the reflective area portion 18, the display operation is not affected by the video signal line 5 provided below the reflective pixel electrode 20, and includes the area overlapping the video signal line 5 in plan view. The entire area is displayed. Therefore, the width W1 of the light shielding area 23 in the reflection area 18 can be set smaller than the width W of the light shielding area 23 in the transmission area 19. In accordance with this, the width W1 of the light shielding region 24 in the reflective region 18 is set to the same width as the width W1 of the light shielding region 23 in the reflective region 18.

  From the above, according to the second embodiment, regardless of whether or not the video signal line 5 is provided, the width W1 of the light shielding region portion 23 and the width W1 of the light shielding region portion 24 in the reflection region portion 18. Are the same. In the transmissive region 19, the width W of the light shielding region 23 and the width W of the light shielding region 24 are the same. Therefore, bright and dark stripes are not visually recognized in both cases of transmissive display and reflective display. In addition, the aperture ratio of the reflection region 18 can be increased.

<Modification>
In the configuration described above, since the width W of the light-shielding region 24 is matched to the width W of the light-shielding region 23 in the transmissive region 19, the light-shielding region 24 that shields light more than necessary is a useless region. Will have. Even if this useless area is used as the reflection area 18, the interval between the transmission areas 19 of adjacent pixels does not vary with the width W, so that the light and dark streaks in the column direction are not visually recognized in the transmission area 19. The aperture ratio of the reflection region 18 can be improved as compared with the above configuration.

  Specifically, as shown in FIG. 10, in the reflection area 18, the width W1 of the light shielding area 23 and the light shielding area 24 is the same as the width W1 of the light shielding area 23 and the light shielding area 24 shown in FIG. It is. In the transmissive area 19, the width W 3 of the light shielding area 23 and the light shielding area 24 is the same as the width W 1 of the light shielding area 23 and the light shielding area 24 in the reflection area 18. The reflective pixel electrodes 20 corresponding to the respective reflective region portions 18 that are adjacent to each other with the light shielding region portion 23 or the light shielding region portion 24 interposed therebetween are planar along the light shielding region portion 23 or the light shielding region portion 24 in the transmissive region portion 19. In view, the side portion is provided so as to protrude from the light shielding region portion 23 or the light shielding region portion 24. At this time, the width W obtained by combining the width of the light shielding region 23 or the light shielding region 24 and the width of the portion protruding from the light shielding region 23 or the light shielding region 24 of each reflective pixel electrode 20 is the light shielding shown in FIG. It is the same as the width W of the area portion 23 and the light shielding area portion 24. That is, the reflection area 18 of each pixel electrode is extended to the transmission area 19 side along the light shielding area 23 and the light shielding area 24, and the extended reflection area 18 and transmission area 19 are provided. Is projected in plan view from the light shielding area 23 and the light shielding area 24 between the reflective areas 18, and the adjacent reflective areas 18 and transmissive areas 19 across the light shielding areas 23 between the transmissive areas 19. Is the same as the distance between the boundaries of the reflective region portions 18 and the transmissive region portions 19 adjacent to each other with the light shielding region portion 24 between the transmissive region portions 19.

  By adopting the above configuration, in addition to the effect obtained by the configuration shown in FIG. 8, the area of the reflection region portion 18 is expanded, so that the aperture ratio of the reflection region portion 18 can be further improved.

  In the first and second embodiments, one pixel is vertically divided into two to provide the reflective region portion 18 and the transmissive region portion 19, and the reflective region portion 18 and the transmissive region portion 19 are arranged in stripes in the row direction. However, the present invention is not limited to this. In the double scanning line method, the arrangement of the TFTs 6 is basically different for each pixel in each column. Therefore, one pixel is divided into two parts in the vertical direction, the side closer to the TFT 6 is used as the reflection region portion 18, and the side far from the TFT 6 is used. It is good also as a structure which is set as a transmissive area | region and the reflective area | region part 18 and the transmissive area | region part 19 are alternately arrange | positioned in a row direction. Alternatively, one pixel may be divided into three parts, upper, middle, and lower, with the central portion serving as the transmissive region portion 19 and the upper and lower portions serving as the reflective region portion 18.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  1 array substrate, 2 color filter substrate, 3, 4 scanning signal line, 5 video signal line, 6 TFT, 7 liquid crystal layer, 8 sealing material, 9 display area, 10, 11 driving IC chip, 12, 13 signal terminal, 14 FFC, 15 control board, 16 FFC, 17 control board, 18 reflective area part, 19 transmissive area part, 20 reflective pixel electrode, 21 transmissive pixel electrode, 22 light shielding layer, 23, 24 light shielding area part, 25, 26 glass substrate, 27 Colored layer, 28 Step forming film, 29 Pixel contact hole, 30 Planarizing film, 31 Light shielding layer, 32, 33 Light shielding area, 34 Light shielding layer, 35, 36 Light shielding area

Claims (7)

A plurality of pixel electrodes arranged in a matrix;
A plurality of scanning signal lines extending in a row direction between the pixel electrodes;
A plurality of video signal lines extending in every two columns in the column direction between the pixel electrodes;
A light shielding layer disposed on each of the pixel electrodes in the row direction and the column direction between the pixel electrodes in a plan view;
With
Each of the pixel electrodes includes a reflective region portion that reflects light and a transmissive region portion that transmits light, which are provided side by side in the column direction.
The light shielding layer includes a first light shielding region portion that overlaps with the video signal line in plan view, and a second light shielding region portion that is in the column direction and does not overlap with the video signal line in plan view,
The width of the second light shielding region between the reflection regions of each pixel electrode is smaller than the width of the first light shielding region between the transmission regions of each pixel electrode. Display device. Between the transmission region portions, the width of the first light shielding region portion and the width of the second light shielding region portion are the same,
2. The liquid crystal display device according to claim 1, wherein a width of the second light shielding area is smaller than a width of the first light shielding area between the reflection areas.   The width of the second light-shielding region between the reflective regions is a width at which the colors corresponding to the pixel electrodes adjacent to each other with the second light-shielding region sandwiched at least in plan view are not mixed. The liquid crystal display device according to claim 1. The width of the second light shielding area between the transmission areas is the same as the width of the second light shielding area between the reflection areas,
The reflection region portions of the pixel electrodes adjacent to each other across the second light shielding region portion between the transmission region portions extend to the transmission region portion side along the second light shielding region portion between the transmission region portions. And the boundary between the reflection region portion and the transmission region portion that is extended and protrudes from the second light shielding region portion between the reflection region portions in a plan view,
The width of the first light shielding area between the transmission areas is the same as the distance between the boundaries adjacent to each other across the second light shielding area between the transmission areas. Item 2. A liquid crystal display device according to item 1. A plurality of pixel electrodes arranged in a matrix;
A plurality of scanning signal lines extending in a row direction between the pixel electrodes;
A plurality of video signal lines extending in every two columns in the column direction between the pixel electrodes;
A light shielding layer disposed on each of the pixel electrodes in the row direction and the column direction between the pixel electrodes in a plan view;
With
Each of the pixel electrodes includes a reflective region portion that reflects light and a transmissive region portion that transmits light, which are provided side by side in the column direction.
The light shielding layer includes a first light shielding region portion that overlaps with the video signal line in plan view, and a second light shielding region portion that is in the column direction and does not overlap with the video signal line in plan view,
Between the transmission region portions of the pixel electrodes, the width of the first light shielding region portion and the width of the second light shielding region portion are the same,
Between the reflection region portions of the pixel electrodes, the width of the first light shielding region portion and the width of the second light shielding region portion are the same,
The widths of the first light shielding region and the second light shielding region between the reflective regions are smaller than the widths of the first light shielding region and the second light shielding region between the transmission regions. A liquid crystal display device. A plurality of pixel electrodes arranged in a matrix;
A plurality of scanning signal lines extending in a row direction between the pixel electrodes;
A plurality of video signal lines extending in every two columns in the column direction between the pixel electrodes;
A light shielding layer disposed on each of the pixel electrodes in the row direction and the column direction between the pixel electrodes in a plan view;
With
Each of the pixel electrodes includes a reflective region portion that reflects light and a transmissive region portion that transmits light, which are provided side by side in the column direction.
The light shielding layer includes a first light shielding region portion that overlaps with the video signal line in plan view, and a second light shielding region portion that is in the column direction and does not overlap with the video signal line in plan view,
The width of the first light shielding area is the same as the width of the second light shielding area,
The reflection region portion of each pixel electrode extends to the transmission region portion side along the first light shielding region portion and the second light shielding region portion, and the extended reflection region portion and the transmission region The boundary with the region portion protrudes in plan view from the first light shielding region portion and the second light shielding region portion between the reflection region portions,
The distance between the boundaries adjacent to each other with the first light shielding area between the transmission areas is the same as the distance between the boundaries adjacent to each other with the second light shielding area between the transmission areas. A liquid crystal display device characterized by the above. An organic resin film covering at least each of the video signal lines;
7. The liquid crystal display device according to claim 5, wherein each of the pixel electrodes is on the organic resin film, and a part thereof overlaps with the video signal line in a plan view.

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