CN101150900B - Light emitting device and display with same - Google Patents

Abstract

A light emission device (100, 100A, 100B, 100C) and a display (200) having the light emission device (100, 100A, 100B, 100C) are provided. The light emission device (100, 100A, 100B, 100C) includes a light emission panel (10) for emitting light, a diffuser plate (20) facing the light emission panel (10) to diffuse the light emitted from the light emission panel (10), and a heat dissipation plate (22, 22', 22'', 36) disposed between the light emission panel (10) and the diffuser plate (20).

Description

Light emitting device and display with same

technical field

The invention relates to a light emitting device and a display with the light emitting device. More specifically, the present invention relates to a light emitting device with a heat dissipation structure and a display with the light emitting device.

Background technique

A field emitter array (FEA) type electron emission element is an electron emission element including one or more electron emission regions, and driving electrodes (e.g., a cathode and a gate) for controlling electron emission from the electron emission regions. . In one embodiment, the electron emission region is formed as a structure with sharp tips and adopts materials such as molybdenum (Mo) and/or silicon (Si) with relatively low work function or relatively large aspect ratio. ), or formed from carbon-based materials such as carbon nanotubes (carbon nanotubes), graphite, and diamond-carbon (diamond-carbon), in order to efficiently emit electrons when an electric field is formed around the electron-emitting region under vacuum conditions.

A plurality of electron emission elements are arranged on the first substrate to constitute an electron emission device. The electron emission device is combined with a second substrate on which a light emission unit having a phosphor layer and an anode is formed to constitute a light emitting device.

In addition to being used as a display, the light emitting device having the above structure can be used as a light source for a passive (non-emissive) type display device.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this Background section to a person of ordinary skill in the art.

Contents of the invention

Embodiments of the present invention relate to a light emitting device with improved heat dissipation efficiency, and a display having the light emitting device.

In an exemplary embodiment of the present invention, the light emitting device includes a light emitting panel for emitting light, a diffuser plate facing the light emitting panel to diffuse light emitted from the light emitting panel, and a diffuser plate disposed between the light emitting panel and the light emitting panel. Heat sink between diffuser plates.

In one embodiment, the light-emitting panel includes an active area for emitting light, and an inactive area surrounding the active area, wherein the heat dissipation plate is located at the inactive area. The heat sink may have a closed curve around the active area. The heat sink may include a base for contacting the light-emitting panel, and a plurality of heat sinks arranged on the base and spaced apart from each other.

In one embodiment, the light-emitting panel includes an active area for emitting light, and an inactive area surrounding the active area, and the heat dissipation plate includes a pattern at the active area such that light emitted from the light-emitting panel can pass through the heat sink. The heat dissipation plate may include a plurality of holes through which light emitted from the light emitting panel can pass, and a non-porous portion that blocks light emitted from the light emitting panel, and, when the active region is formed by all When the area occupied by the hole is S1 and the area occupied by the non-porous part is S2, the following conditions are met:

1≤S1/S2≤19.

The holes may have a pitch in the active area. The holes may be arranged to correspond to respective pixels of the light emitting panel. The heat dissipation plate may have a stripe pattern or a mesh pattern. The heat dissipation plate may be a metal material deposited and patterned on the light emitting panel (and/or may be a light emitting plate).

In one embodiment, the heat sink includes a material selected from the group consisting of aluminum, silver, copper, platinum, and combinations thereof.

In one embodiment, the heat dissipation plate has a thickness ranging from 0.05 to 10 nm.

In one embodiment, the heat sink is a molded metal plate.

In one embodiment, the light-emitting panel includes a first substrate, a second substrate opposite to the first substrate, a light-emitting unit on the second substrate for emitting light, and a light-emitting unit on the first substrate for emitting electrons. Electron emission unit. The electron emission unit may include a cathode on the first substrate, a plurality of electron emission regions electrically connected to the cathode, and a gate electrically insulated from the cathode. The light emitting unit may include an anode on the second substrate and a phosphor layer, and the anode may be suitable for applying a voltage in the range of 10-20KV.

In another embodiment of the present invention, a display includes a display panel for displaying images, and a light emitting device for providing light to the display panel. Here, the light emitting device includes a light emitting panel for emitting light, a diffusion plate facing the light emitting panel for diffusing light emitted from the light emitting panel, and a heat dissipation plate disposed between the light emitting panel and the diffusion plate .

In one embodiment, the display panel includes a plurality of first pixels arranged in rows and columns, and the light emitting device includes a plurality of second pixels arranged in rows and columns, wherein the first pixels are more in number than the second pixels . The lighting device can be configured to represent a gray scale ranging from 2 to 8 bits for each pixel.

In one embodiment, the light emitting unit includes an anode on the second substrate and a phosphor layer, and the phosphor layer is a white phosphor layer.

Description of drawings

FIG. 1 is an exploded perspective view of a light emitting device according to a first exemplary embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the light emitting device of FIG. 1 .

FIG. 3 is a partially cutaway perspective view of the light emitting panel of FIG. 1 .

FIG. 4 is a schematic cross-sectional view of the light-emitting panel along line IV-IV in FIG. 3 .

5 is a partial cross-sectional view of a light emitting device according to a second exemplary embodiment of the present invention.

6 is an exploded perspective view of a light emitting device according to a third exemplary embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of the light emitting device of FIG. 6 .

8 and 9 are top views of modified embodiments of the heat sink.

FIG. 10 is an exploded perspective view of a display according to an example embodiment of the present invention.

FIG. 11 is a partially cutaway perspective view of the display panel of FIG. 6 .

FIG. 12 is a schematic block diagram of a driving section for driving the display of FIG. 10 .

Detailed ways

In the following detailed description, only some exemplary embodiments of the present invention are shown and described, by way of example only. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and descriptions are exemplary in nature and not restrictive. Hereinafter, the same reference numerals denote the same elements.

In an exemplary embodiment of the present invention, a device that can emit light to the outside is referred to as a light emitting device. Therefore, all displays capable of conveying information by displaying symbols, characters, numbers, and images can be called light emitting devices. In addition, the light emitting device may be used as a light emitting panel for emitting light to a passive type display panel (or a non-emissive display panel). The panels may be flat panels, circular panels, or other types of panels.

FIG. 1 is an exploded perspective view of a light emitting device according to a first exemplary embodiment of the present invention.

Referring to FIG. 1 , a light emitting device 100A includes a light emitting panel 10 , a diffusion plate 20 , and a heat dissipation plate 22 .

The light emitting panel 10 is a surface (or area) light emitting type panel that radiates light by exciting a phosphor layer deposited on a predetermined area. The light emitting panel 10 includes a first substrate 12, a second substrate 14, an electron emission unit (110 in FIG. 2), and a light emitting unit (120 in FIG. 2). In this embodiment, the light-emitting panel 10 emits radiated light through electrons.

The diffusion plate 20 is positioned on the light emitting panel 10 to diffuse light radiated from the light emitting panel 10 .

The heat dissipation plate 22 is disposed between the light emitting panel 10 and the diffusion plate 20 to dissipate heat to the outside of the heat dissipation plate 22 (or to dissipate heat to the outside of the light emitting device 100A).

FIG. 2 is an enlarged cross-sectional view of the light emitting device of FIG. 1 .

Referring to FIG. 2 , the light emitting panel 10 includes first and second substrates 12 and 14 disposed to face each other in a substantially parallel manner with a space therebetween. A sealing member 16 is disposed between the first and second substrates 12 and 14 along edge portions thereof to seal the first and second substrates 12 and 14 together to form a vessel having an inner space. The inner space of the container is evacuated to maintain a vacuum of about 10 ^-6 Torr.

The electron emission unit 110 formed by the electron emission element array is disposed on the surface of the first substrate 12 facing the second substrate 14, and includes a phosphor layer (32 in FIG. 3 ) and an anode (34 in FIG. 3 ) for emitting light. The unit 120 is disposed on the surface of the second substrate 14 facing the first substrate 12 . A plurality of spacers 18 are provided between the first and second substrates 12 and 14 to resist the atmospheric pressure applied to the container (or vacuum container), and thus ensure the space between the first and second substrates 12 and 14. Keep the intervals even.

The light emitting panel 10 includes an active area A and a non-active area NA formed around the active area A. As shown in FIG. The cooling plate 22 is located in this passive area. For example, the heat dissipation plate 22 may be formed in a closed curve around the active area A (or may be formed as a closed curve structure). In the active area A, a gap G (which may be predetermined) is defined between the light emitting panel 10 and the diffuser plate 20 with the heat dissipation plate 22 . In order to define the gap G, the cooling plate 22 may have a thickness ranging from 0.05 to 10 mm. In one embodiment, when the thickness is less than 0.05 mm, the heat dissipation efficiency deteriorates due to the thickness reduction. In another embodiment, when the thickness is greater than 10mm, the distance between the light emitting panel 10 and the diffuser plate 20 is relatively high, so that the light transmittance will be deteriorated, resulting in excessive light loss.

In addition, since the heat dissipation plate 22 is only located at the passive area NA, the light radiated from the light emitting unit 120 will not be blocked by the heat dissipation plate 22 . However, in another embodiment, when the heat dissipation plate 22 is formed of a transparent material, the heat dissipation plate 22 may be located at the active area A. Referring to FIG.

In order to effectively dissipate heat from the light emitting panel 10, the heat dissipation plate 22 may be formed of metal or alloy having a relatively high heat transfer coefficient (thermal conductivity). For example, the heat sink plate 22 may be formed of a material selected from the group consisting of aluminum (Al), silver (Ag), copper (Cu), platinum (Pt), and combinations thereof.

In addition, the diffusion plate 20 serves to diffuse light emitted from the light emitting unit 120 so as to minimize brightness deviation between the passive area and the active area.

The luminescent panel having the above structure can be applied to various types of electron emission displays, such as FEA type (field emitter array type) electron emission display, SCE type (surface conduction emission type) electron emission display, MIM type (metal Metal Insulator type) electron emission display, and MIS type (Metal Insulator Semiconductor type) electron emission display. In the following description, the FEA type light emitting panel will be described in more detail by way of example.

FIG. 3 is a cross-sectional view of the light emitting panel of FIG. 1 , showing the internal structure of the light emitting panel 10 .

Referring to FIG. 3 , cathodes 24 are formed on the first substrate 12 in a stripe pattern extending in the y direction. A first insulating layer 26 is formed on the first substrate 12 while covering the cathode 24 . The gate electrode 28 is formed on the first insulating layer 26 in a stripe pattern extending in the x direction, intersecting with (or perpendicular to) the cathode 24 .

With this structure, an intersecting region is formed by intersecting the cathode 24 and the gate 28 . Each of the intersection regions forms a unit pixel of the light emitting panel 10 . A plurality of electron emission regions 30 are formed at each unit pixel on the cathode 24 .

The electron emission region 30 provided in the above structure is formed of a material that emits electrons when an electric field is applied thereto under a vacuum environment, such as a carbon-based material and/or a nano-sized material. In one embodiment, the electron emission region 30 may be formed of carbon nanotubes, graphite, graphite nanofibers, diamond, diamond-like carbon, spherical carbon molecules (C ₆₀ ), silicon nanowires, or a combination thereof. Alternatively, the electron emission region 30 may be formed of a molybdenum (molybdenum-based)-based material and/or a silicon-based (silicon-based) material. In this case, the electron emission region 30 may be formed to have a sharp tip structure.

The first opening 261 and the second opening 281 are respectively formed on the first insulating layer 26 and the gate 28 to expose the electron emission region 30 on the first substrate 12 .

The phosphor layer 32 is formed on the surface of the second substrate 14 facing the first substrate 12 . The phosphor layer 32 may be a white phosphor layer. The phosphor layer 32 may be formed on the entire active area of the second substrate 14, or may be in the form of a pattern (or predetermined pattern) in which a white phosphor layer is disposed corresponding to each unit pixel.

Alternatively, the phosphor layer 32 may be realized by a combination of red, green, and blue phosphor layers, and in this case, the phosphor layers are arranged in a pattern (or a predetermined pattern) for each unit pixel. In the exemplary embodiment, the phosphor layer 32 is a white phosphor layer formed on the entire active area of the second substrate 14 .

The anode 34 is formed on this phosphor layer 32 and is made of metal such as aluminum (Al). The anode 34 receives an external high voltage (for example, a voltage range of 10-20KV) to keep the phosphor layer 32 in a high potential state. In addition, the anode 34 can be used to improve brightness; that is, between the visible light emitted from the phosphor layer 32, the visible light emitted from the phosphor layer 32 to the first substrate 12 can be directed toward the second substrate by the anode 34. 14 is reflected back, thereby increasing the brightness. Here, the phosphor layer 32 and the anode 34 are laminated on the second substrate 14 in this order so that the phosphor layer 32 is adjacent to the second substrate 14 . Therefore, since the anode 34 does not obstruct (or block) light emitted from the phosphor layer 32, the anode 34 can be formed of an opaque metal having high electrical conductivity.

In an alternate embodiment, the phosphor layer and anode can be reversed. That is, in this case, an anode formed of a transparent conductive material such as indium tin oxide (ITO), the anode may be disposed between the second substrate and the phosphor layer. In another alternative embodiment, the anode can be realized by a structure in which a metal layer is formed on a transparent conductive layer.

FIG. 4 is a cross-sectional view along line IV-IV in FIG. 3 . The following description will describe the operation of the light emitting panel 10 in a more detailed manner.

The light-emitting panel 10 forms a plurality of unit pixels through the combination of the cathode 24 and the gate 28 , and is driven by an external voltage (or a predetermined external voltage) applied to the cathode 24 , the gate 28 , and the anode 34 . For example, the cathode 24 may be used as a scan electrode for receiving a scan driving voltage, and the gate 28 may be used as a data electrode for receiving a data voltage. Alternatively, the gate electrode 28 may be used as a scan electrode for receiving a scan driving voltage, and the cathode 24 may be used as a data electrode for receiving a data voltage. In addition, anode 34 receives a positive DC voltage (eg, in the range of 10-20 KV) required to accelerate electrons.

Next, an electric field is formed around the electron emission region 30 at the unit pixel, wherein the voltage difference between the cathode and gate electrodes 24 and 28 is equal to or greater than a threshold value, thereby causing the electron emission region 30 to emit electrons (e-), as It is shown by the dotted line in Figure 4. The emitted electrons are attracted by the high voltage applied to the anode 34 to collide with corresponding regions of the phosphor layer 32 and excite the phosphor layer 32 . Here, the intensity of light emitted from the phosphor layer 32 at each unit pixel corresponds to the number of electrons emitted by the electron beam of the corresponding pixel.

During the above driving process, the heat generated from the electron emission unit 110 and the light emitting unit 120 is dissipated to external.

The light emitting panel 10 described above is driven with lower power than a light emitting diode (LED) type light emitting panel or a cold cathode fluorescent lamp (CCFL) type light emitting panel. In addition, the luminescent panel 30 allows independent control of the luminous intensity of each pixel. The independent driving of the pixels involves the driving of the display panel to be described next, and contributes to enhancing the dynamic contrast of an image formed by the display panel.

5 is a cross-sectional view of a light emitting device according to a second embodiment of the present invention. For convenience, in FIGS. 5 and 2, the same elements will be denoted by the same reference numerals, and descriptions thereof will not be given again.

Referring to FIG. 5 , the light emitting device 100B of this embodiment includes a heat dissipation plate 36 formed with an uneven surface structure.

That is, the heat dissipation plate 36 includes a base 361 and a plurality of heat dissipation fins 362 . The base 361 contacts the second substrate 14 . The cooling fins 362 are arranged on the base 361 and spaced apart from each other by a certain (or predetermined) distance. The cooling fins 362 increase the contact (or surface) area with the outside air, thereby improving the heat dissipation efficiency.

Fig. 6 is a schematic perspective view of a light emitting device according to a third embodiment of the present invention. For convenience, in FIGS. 1 and 6, the same elements will be denoted by the same reference numerals, and description thereof will not be given again.

Referring to Fig. 6, the light emitting device 100C of this embodiment includes a light emitting panel 10, a diffuser plate 20, and a heat dissipation plate 22'. The heat dissipation plate 22' is formed to have a specific (or predetermined) pattern.

Fig. 7 is an enlarged cross-sectional view of the light emitting device of Fig. 6, showing the internal structure of the light emitting device. As shown in FIG. 7, the heat dissipation plate 22' is patterned in the active area A such that it allows the light emitted from the light emitting panel 10 to pass through. In more detail, the heat dissipation plate 22' includes a plurality of holes 221' and a non-porous portion 222' through which the light emitted from the luminous panel 10 passes through, and the light emitted from the luminous panel 10 is absorbed by the non-porous part 222'. Hole portion 222' blocks.

The holes 221' are arranged at a certain (or predetermined) pitch in rows extending in the x direction and in columns extending in the y direction. The holes 221' may be formed in a regular arrangement or an irregular arrangement. When the holes 221' are formed in a regular arrangement, the holes 221' may be formed to correspond to each unit pixel. In addition, when a black layer is formed on the light emitting panel 10, the non-porous portion 222' may be formed to correspond to the black layer.

In addition, when the area occupied by the hole 221' in the active region is S1, and the area occupied by the non-hole portion 222' is S2, the following conditions are satisfied:

1≤S1/S2<19.

When the area ratio (S1/S2) is 1, this means that the aperture ratio (area ratio of hole area to active region) is 50%. Further, when the area ratio is 19, this means that the opening ratio is 95%. In one embodiment, when the area ratio is less than 1, the brightness of the light emitting panel 10 will decrease. In another embodiment, when the area ratio is greater than 19, the heat dissipation efficiency of the heat dissipation plate 22' will be deteriorated (or extremely deteriorated).

According to this example embodiment, even though the heat dissipation plate 22' is formed of an opaque material and disposed on the active area A, light emitted from the light emitting panel 10 can pass through the heat dissipation plate 22' through the hole 221'. Therefore, the light emitting device 100C can perform a heat dissipation operation while maintaining a proper (or normal) light emitting function.

Figures 8 and 9 show a modification of the cooling plate 22". As shown in Figures 8 and 9, the cooling plate 22" can be formed in a strip pattern, wherein a plurality of strips are arranged parallel to each other (Fig. Crossed mesh pattern (Figure 9). Portions indicated by dotted lines in FIGS. 8 and 9 represent unit pixels. However, the heat dissipation plate is not limited to the above-described embodiments and modifications. The shape of the cooling plate can vary as long as it allows light to pass through.

The heat dissipation plates 22', 22" can be formed by depositing a metal material on the second substrate 14 and processing the metal material layer into the above-mentioned pattern. Alternatively, a separately formed metal plate can be inserted between the second substrate 14 and the diffusion plate. Between 20.

The light emitting devices 100A, 100B, and 100C of the foregoing embodiments can be applied to a display that will be described in detail below.

Fig. 10 shows a display with a light emitting device 100 according to an example embodiment of the present invention.

Referring to FIG. 10 , a display 200 includes a light emitting device 100 and a display panel 210 disposed on the light emitting device 100 .

Display panel 210 may be a liquid crystal display panel or other type of passive (non-emissive) display panel. In the following description, the display panel 210 is assumed to be a liquid crystal display panel by way of example.

The display panel 210 includes a plurality of pixels arranged in rows and columns, and the light emitting device 100 is disposed behind the display panel 210 to emit light toward the display panel 210 . The light emitting device 100 has a smaller number of pixels than the display panel 210 . The pixels of the light emitting device 100 are also arranged in rows and columns. For example, one pixel of the light emitting device 100 may correspond to two or more pixels of the display panel 210 . Here, the row direction may be the x direction of the display 200 , and the column direction may be the y direction of the display 200 . Here, the cathode ( 24 in FIG. 3 ) of the light emitting device 100 is formed to extend in the column direction, and the gate ( 28 in FIG. 3 ) is formed to extend in the row direction.

FIG. 11 is a partial cross-sectional view of the display panel 210 of FIG. 10 .

Referring to FIG. 11 , the display panel 210 includes a transparent third substrate 42 , a transparent fourth substrate 44 , and a liquid crystal layer 46 disposed between the third and fourth substrates 42 and 44 .

The pixel electrode 48 and the switching element 50 are formed on the inner surface of the third substrate 42 (or on the surface of the third substrate 42 facing the fourth substrate). The common electrode 52 is formed on the inner surface of the fourth substrate 44 (or on the surface of the fourth substrate 44 facing the third substrate 42 ).

A pair of polarizing plates 54 and 56 are located on the outer surfaces of the third and fourth substrates 42 and 44, respectively. The polarizing plates 54 and 56 are arranged such that their polarization axes cross each other (for example, cross each other at right angles). The alignment layers 58 are disposed to face each other with the liquid crystal layer 46 interposed therebetween.

A plurality of gate lines 60 for transferring gate signals (scanning signals) and a plurality of data lines 62 for transferring data signals are formed on the inner surface of the third substrate 42 . The gate lines 60 extend parallel to each other in the x direction, and the data lines 62 extend parallel to each other in the y direction.

The pixel electrodes 48 are respectively located at the sub-pixels and connected to the gate and data lines 60 and 62 through the switching elements 50 .

The color filter 64 is disposed between the fourth substrate 44 and the common electrode 52 . The color filter 64 includes red, green and blue color filters corresponding to the respective sub-pixels. The three sub-pixels where the red, green and blue color filters are respectively located form a unit pixel.

With the above-described display panel 210, when the switching element 50 is turned on, an electric field is formed between the pixel electrode 48 and the common electrode 52, and the twist angle of liquid crystal molecules located in the liquid crystal layer 46 is changed by the electric field. The display panel 210 controls the twist angle of each liquid crystal molecule at each sub-pixel to control the amount of passing light, thereby realizing a color image.

FIG. 12 is a block diagram of a driving section for driving the display 200. Referring to FIG.

Referring to FIG. 12, the driving part of the display includes gate drivers and data drivers 212 and 214 connected to the display panel 210, a grayscale voltage generator 216 connected to the data driver 214, and for controlling the gate drivers and data drivers 212 and 214 and The signal controller 218 of the display panel 210 and the light emitting device 100 .

When the display panel 210 is taken as an equivalent circuit, the display panel 210 includes a plurality of signal lines and a plurality of pixels PX, and the pixels PX are arranged in rows and columns and connected to the signal lines. The signal lines include gate lines G ₁ -G _n for transmitting gate signals (scanning signals) and data lines D ₁ -D _m for transmitting data signals.

Each pixel PX, for example, the pixel 211 connected to the i-th (i=1, 2, ... n) gate line G _i and the j-th (j = 1, 2, ... m) data line D _i includes A switching element Q connected to a gate (or signal) line G _i and a data (or signal) line D _i , and a liquid crystal and sustain capacitors Clc and Cst connected to the switching element Q. In another embodiment, the sustain capacitor Cst may be omitted if needed or desired.

The switching element Q is a 3-terminal element such as a thin film transistor (TFT) formed on the lower substrate of the display panel 210 . That is, the switching element Q includes a control terminal connected to the gate line _Gi , an input terminal connected to the data line _Dj , and an output terminal connected to the liquid crystal and the sustain capacitors Clc and Cst.

The gray voltage generator 216 generates two sets of gray voltages (or two sets of reference gray voltages) related to the transmittance of the pixel PX. One of the two groups has a positive value with respect to the common voltage Vcom, the other has a negative value.

The gate driver 212 is connected to the gate lines G ₁ -G _n of the display panel 210 to apply a gate signal to the gate lines G ₁ -G _n , the gate signal being a combination of an on voltage Von and an off voltage Voff.

The data driver 214 is connected to the data lines D ₁ -D _m of the display panel 210 . The data driver 214 selects a gray voltage from the gray voltage generator 216 and applies the selected gray voltage to the first data lines D1 _{- Dm} . However, when the gray voltage generator 216 does not provide all voltages for all gray levels but only a certain (or predetermined) number of reference gray voltages, the data driver 214 divides the reference gray voltages to generate voltages for all gray levels. The gray voltage of the gray scale, and select the data signal from the gray voltage.

The signal controller 218 controls the gate driver 212 , the data driver 214 , and the light emitting device controller 220 . The signal controller 218 receives input video signals R, G, and B and input control signals for controlling image display from an external graphics controller.

The input video signals R, G, and B have luminance information for each pixel PX. The luminance information includes information on a certain (or predetermined) number of gradations (for example, 1024 (=2 ¹⁰ ), 256 (=2 ⁸ ), or 64 (=2 ⁶ )). The input control signal may be a vertical sync signal Vsync, a horizontal sync signal Hsync, a main clock signal MCLK, and/or a data enable signal DE.

The signal controller 218 appropriately processes the input video signals R, G, and B in response to the operation of the display panel 210 with reference to the input control signal, generates a gate control signal CONT1 and a data control signal CONT2, and transmits the gate control signal CONT1 to the first gate driver. 212 , and transmit the data control signal CONT2 and the processed image signal DAT to the data driver 214 . In addition, the signal controller 218 transmits the gate control signal CONT1 , the data control signal CONT2 , and the processed video signal DAT to the light emitting device controller 220 .

The light emitting device 100 includes a light emitting device controller 220 , a column driver 222 , a scan driver 224 , and a display unit 226 .

The display unit 226 includes a plurality of scan lines S ₁ -S _p for transmitting scan signals, a plurality of column lines C ₁ -C _q for transmitting column signals, and a plurality of light emitting pixels EPX. The light-emitting pixels EPX are located in respective regions defined by intersections of scan lines S ₁ -S _p and column lines C ₁ -C _q . Scan lines S ₁ -S _p are connected to scan driver 224 and column lines C ₁ -C _q are connected to column driver 222 . The scan driver 224 and the column driver 222 are connected to the light emitting device controller 220 to operate in response to control signals of the light emitting device controller 220 .

The scan lines S ₁ -S _p are the scan electrodes of the above light emitting device, and the column lines C ₁ -C _q are the data electrodes of the above light emitting device.

The light emitting device controller 220 generates a scan driver control signal CS for controlling the scan driver 224 using the gate control signal CONT1 and transmits the scan driver control signal CS. In addition, the light emitting device controller 220 uses the data control signal to generate a column driver control signal CC and further generates a column signal CLS corresponding to the video signal DAT. The generated column driver control signal (CC) and column signal (CLS) are transmitted to the column driver 222 . The lighting device controller 220 generates brightness information for each pixel of the lighting device 100 from a frame of the video signal DAT and further generates a column signal CLS according to the generated brightness information.

The scan driver 224 sequentially applies driving voltages each having a certain (or predetermined) pulse to the scan lines S ₁ -S _p in response to the input scan driver control signal. The column driver 222 applies a driving voltage corresponding to the color signal CLS to the column lines C ₁ -C _q in response to the input column driver control signal.

With the above structure, the display unit 226 of the light emitting device 100 receives a driving signal synchronized with a video signal, emits light having an appropriate intensity in response to brightness information of each pixel, and provides the emitted light to the display panel 210 . Each light-emitting pixel EPX of the light-emitting device 226 can be driven to represent a gray scale in a range of 2 to 8-bit gray scales.

According to the exemplary embodiments described above, when the display panel 210 displays images with different brightness in different regions, the light emitting device 100 can provide relatively high-intensity light to pixels of the display panel displaying relatively bright images, and provide relatively low-intensity light. to the pixels of the display panel that display relatively dark images. In addition, the light-emitting pixels of the light-emitting device 100 , which correspond to the pixels of the display panel and display black images, can be turned off.

As a result, the display 200 can improve the dynamic contrast through the above-described control process.

Since the light emitting devices of the aforementioned exemplary embodiments are surface (or area) light sources, optical elements for CCFL type backlight units and LED type backlight units are no longer necessary. Also, the light emitting device of the aforementioned example embodiments reduces light loss that may occur when light passes through an optical element. Therefore, high-intensity light does not need to be emitted, and power consumption can be reduced.

In addition, since no optical elements are required, the manufacturing cost is reduced to be lower than that of the LED type backlight unit.

In addition, since the light emitting device is easily formed to have a relatively large size, it can be used for a display larger than 30 inches.

In addition, in one embodiment, since the heat dissipation plate is provided between the light emitting panel and the display panel, heat can be effectively dissipated without blocking the light emitted from the light emitting panel.

While the invention has been described in terms of some exemplary embodiments, it should be understood that the invention is not limited to the disclosed embodiments, but that it is intended to cover changes and modifications within the spirit and scope of the appended claims and their equivalents. Equivalent scheme.

Claims (20)

1. light-emitting device comprises:

The electron emission type luminescent panel comprises the inactive regions that is used for luminous active region and centers on this active region, is formed with electron emission unit and corresponding luminescence unit in this active region;

Diffusing panel in the face of this luminescent panel, is used for the light of diffusion from this luminescent panel emission; And

Heating panel is arranged between this luminescent panel and this diffusing panel.

2. light-emitting device as claimed in claim 1,

Wherein this heating panel is positioned at this inactive regions place.

3. light-emitting device as claimed in claim 2, wherein this heating panel has the closed curve around this active region.

4. light-emitting device as claimed in claim 2, wherein this heating panel comprises:

Substrate is used to contact this luminescent panel; And

A plurality of fin are arranged in this substrate and the space.

5. light-emitting device as claimed in claim 1,

Wherein this heating panel comprises pattern at this active region, makes to pass this heating panel from the luminous energy of this luminescent panel emission.

6. light-emitting device as claimed in claim 5, wherein this heating panel comprises a plurality of holes and no bore portion, the luminous energy of launching from this luminescent panel passes from described hole, and is stopped by described no bore portion from the light of this luminescent panel emission, and

Wherein, when the area that is occupied by described hole in this active region is S1, when the area that occupied by this no bore portion is S2, satisfy following condition:

1≤S1/S2≤19。

7. light-emitting device as claimed in claim 6, wherein said hole has pitch in this active region.

8. light-emitting device as claimed in claim 6, wherein said hole are arranged to corresponding with each pixel of this luminescent panel.

9. light-emitting device as claimed in claim 5, wherein this heating panel has bar paten or net-like pattern.

10. light-emitting device as claimed in claim 5, wherein this heating panel is to deposit the also metal material of composition on this luminescent panel.

11. light-emitting device as claimed in claim 1, wherein this heating panel comprises the material of selecting from aluminium, silver, copper, platinum and the group that constitutes thereof.

12. light-emitting device as claimed in claim 1, wherein the thickness range of this heating panel is 0.05-10nm.

13. light-emitting device as claimed in claim 1, wherein this heating panel is molded metallic plate.

14. light-emitting device as claimed in claim 1, wherein this luminescent panel comprises:

First substrate; And

Second substrate is relative with this first substrate;

Wherein this luminescence unit is formed on this second substrate, is used for luminous; And

Wherein this electron emission unit is formed on this first substrate, is used for emitting electrons.

15. as the light-emitting device of claim 14, wherein this electron emission unit comprises:

Negative electrode is positioned on this first substrate;

A plurality of electron emission regions are electrically connected to this negative electrode; And

Grid is with this cathodic electricity insulation.

16. as the light-emitting device of claim 14, wherein this luminescence unit comprises luminescent coating and the anode that is positioned on this second substrate, and this anode is applied with the voltage of 10-20KV scope.

17. as the light-emitting device of claim 14, wherein this luminescence unit comprises luminescent coating and the anode that is positioned on this second substrate, and this luminescent coating is the white phosphor layer.

18. a display comprises:

Display floater is used for display image; And

Light-emitting device is used for providing light to this display floater,

Wherein this light-emitting device comprises

The electron emission type luminescent panel comprises the inactive regions that is used for luminous active region and centers on this active region, is formed with electron emission unit and corresponding luminescence unit in this active region,

Diffusing panel in the face of this luminescent panel, is used for the light of diffusion from this luminescent panel emission, and

Heating panel is arranged between this luminescent panel and this diffusing panel.

19. as the display of claim 18, wherein this display floater comprises a plurality of first pixels of arranging with row and column, and this light-emitting device comprises that wherein the quantity of this first pixel is greater than this second pixel with a plurality of second pixels of row and column arrangement.

20. as the display of claim 19, wherein this light-emitting device be configured to for described second pixel each expression 2 to 8 bit range tonal gradation in gray scale.

Images