JP2007279176A - Liquid crystal device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device capable of suppressing imbalance of white balance of a display screen with passage of time. <P>SOLUTION: The liquid crystal device is constituted of an illumination device and a liquid crystal display panel. The illumination device has a plurality of light sources which respectively emit different color beams and wherein light emission intensity of each color beam is lowered with passage of time. The liquid crystal display panel has a transmission region transmitting the beams emitted from the illumination device in a subpixel. The quicker the light emission intensity lowering speed of the beam is, the lower a current value of the light source emitting the color beam is set to be and the slower the light emission intensity lowering speed of the beam is, the higher the current value is set to be. The quicker the light emission intensity lowering speed of the beam is, the larger the area of the transmission region of the subpixel corresponding to the color is set to be and the slower the light emission intensity lowering speed of the beam is, the smaller the area of the transmission region of the subpixel is set to be. Thereby, imbalance of white balance in the display screen can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal device suitable for use in displaying various information.

  In the liquid crystal device, an illumination device is provided as a backlight on the back side of the liquid crystal display panel in order to perform transmissive display. An illuminating device having an LED (Light Emitting Diode) of each color of RGB as a light source generates white light by mixing light emitted from each LED, and the generated white light is generated on the back side of the liquid crystal display panel. Irradiate. A liquid crystal device is a color filter that transmits white light emitted from a backlight to light of each wavelength of red (R), green (G), and blue (B) stacked on a substrate of a liquid crystal display panel. Color display is realized by allowing the light to pass through.

  However, the light emitted from the LED has a characteristic that the light intensity decreases with time. In addition, the manner in which the light intensity decreases with the passage of time varies depending on the color of light emitted from the LED. Therefore, there is a problem that the white balance on the display screen is lost as time passes. In the liquid crystal device described in Patent Document 1, the luminance of each display color is made constant by making the total average current supplied to the LEDs of RGB colors constant.

JP 2000-214825 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal device capable of preventing the white balance on the display screen from being lost over time.

  In one aspect of the present invention, a liquid crystal device includes a lighting device having a plurality of light sources that emit different colored light and whose emission intensity decreases with the passage of time, and subpixels corresponding to the respective colors. And a liquid crystal display panel having a transmission region that transmits light emitted from the illuminating device in the sub-pixel, and a current value of the light source that emits the light of each color has an emission intensity of The light whose rate of decrease is faster is set smaller, the light whose rate of decrease in light emission intensity is lower is set larger, and the area of the transmission region of the sub-pixel corresponding to each color is faster in the rate of decrease in light emission intensity. The light color sub-pixel is set larger, and the light color sub-pixel whose light emission intensity decreases more slowly is set smaller.

  The liquid crystal device includes an illumination device and a liquid crystal display panel. The illuminating device has a plurality of light sources that each emit different colored light and whose light emission intensity decreases with time. For example, an LED (Light Emitting Diode) is used as the light source. The liquid crystal display panel has sub-pixels corresponding to the respective colors, and has a transmission region in the sub-pixel that transmits light emitted from the illumination device. The current value of the light source that emits the light of each color is set to be smaller as the light whose light emission intensity decreases is faster, and is set to be larger as the light whose light emission intensity decreases is lower, and the sub-pixel corresponding to each color. The area of the transmissive region is set to be larger as the light color sub-pixel having a faster light emission intensity decrease rate, and is set to be smaller as the light color sub-pixel having a lower light emission intensity decrease rate. By doing in this way, the liquid crystal device can suppress the white balance on the display screen from being lost over time.

  In a preferred aspect of the above-described liquid crystal device, the plurality of light sources are light sources that emit light of each color of RGB, and the light emission intensity of the light of each color of RGB is set so that the light of B is the smallest, and the light of R Is set to be the largest, and the area of the transmissive region of the sub-pixel corresponding to each color is set to be the largest for the B sub-pixel and the smallest for the R sub-pixel.

  In still another aspect of the present invention, an electronic apparatus including the above-described liquid crystal device in a display portion can be configured.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Configuration of liquid crystal device]
First, the configuration and the like of the liquid crystal device 100 according to the present embodiment will be described with reference to FIGS.

  FIG. 1 is a plan view schematically showing a schematic configuration of a liquid crystal device 100 according to the present embodiment. In FIG. 1, a color filter substrate 92 is disposed on the front side (observation side) of the paper, and an element substrate 91 is disposed on the back side of the paper. In FIG. 1, the vertical direction (column direction) on the paper surface is defined as the Y direction, and the horizontal direction (row direction) on the paper surface is defined as the X direction. In FIG. 1, the regions corresponding to R (red), G (green), and B (blue) are R subpixels SG (R), G subpixels SG (G), and B subpixels SG ( Each of B) is shown. The 1 × 3 subpixels SG (R), SG (G), and SG (B) corresponding to RGB indicate one display pixel AG. As will be described in detail later, the sub-pixel area of each color has the largest area for the B sub-pixel SG (B) and the smallest area for the R sub-pixel SG (R).

  FIG. 2 is an enlarged cross-sectional view of one display pixel AG along the cutting line AA ′ in the liquid crystal device 100. As shown in FIG. 2, the liquid crystal device 100 includes a lighting device 10 and a liquid crystal display panel 30. In the liquid crystal display panel 30, an element substrate 91 and a color filter substrate 92 disposed to face the element substrate 91 are bonded together via a frame-shaped sealing material 5, and liquid crystal is enclosed inside the sealing material 5. Thus, the liquid crystal layer 4 is formed. The liquid crystal used for the liquid crystal layer 4 is, for example, a TN (Twisted Nematic) type liquid crystal. The illumination device 10 is provided on the outer surface of the element substrate 91 of the liquid crystal display panel 30.

  The liquid crystal device 100 according to this embodiment is a completely transmissive liquid crystal device, and is a color display liquid crystal device configured using three colors of R, G, and B. The liquid crystal device 100 is an active matrix liquid crystal device using an α-Si TFT (Thin Film Transistor) element as an example of a switching element.

  A planar configuration of the element substrate 91 will be described. On the inner surface of the element substrate 91, a plurality of source lines 32, a plurality of gate lines 33, a plurality of α-Si TFT elements 37, a plurality of pixel electrodes 34, a driver IC 40, an external connection wiring 35, and an FPC ( Flexible Printed Circuit) 41 or the like is formed or mounted.

  As shown in FIG. 1, the element substrate 91 has a protruding region 31 that protrudes outward from one side of the color filter substrate 92, and a driver IC 40 is mounted on the protruding region 31. A terminal (not shown) on the input side of the driver IC 40 is electrically connected to one end side of the plurality of external connection wirings 35, and the other end side of the plurality of external connection wirings 35 is electrically connected to the FPC 41. It is connected. Each source line 32 is formed so as to extend in the Y direction and at an appropriate interval in the X direction, and one end side of each source line 32 is connected to an output side terminal (not shown) of the driver IC 40. Electrically connected.

  Each gate line 33 includes a first wiring 33a formed so as to extend in the Y direction, and a second wiring 33b formed so as to extend in the X direction from the terminal portion of the first wiring 33a. ing. The second wiring 33 b of each gate line 33 is formed to extend in the direction intersecting each source line 32, that is, in the X direction and at an appropriate interval in the Y direction. One end of one wiring 33a is electrically connected to a terminal (not shown) on the output side of the driver IC 40. An α-TFT element 37 is provided at a position corresponding to the intersection of each source line 32 and each gate line 33 with the second wiring 33 b, and each α-TFT element 37 includes each source line 32, each gate line 33, and each gate line 33. It is electrically connected to each pixel electrode 34 and the like. Each α-TFT element 37 and each pixel electrode 34 are provided at positions corresponding to each sub-pixel SG on the substrate 1 such as glass. Each pixel electrode 34 is formed of a transparent conductive material such as ITO (Indium-Tin Oxide).

  A region in which a plurality of display pixels AG are arranged in a matrix in the X and Y directions is an effective display region V (a region surrounded by a two-dot chain line). In the effective display area V, images such as letters, numbers, and figures are displayed. The area outside the effective display area V is a frame area 38 that does not contribute to display. An alignment film (not shown) is formed on the inner surface of each source line 32, each gate line 33, each α-TFT element 37, each pixel electrode 34, and the like.

  Next, the planar configuration of the color filter substrate 92 will be described. As shown in FIG. 2, a color filter substrate 92 is formed on a substrate 2 such as glass on a light shielding layer (generally referred to as “black matrix”, hereinafter simply abbreviated as “BM”), and three colors of RGB. The coloring layers 6R, 6G, and 6B, the common electrode 8, and the like are included. The BM is formed at a position that partitions the sub-pixels SG for each color. In the following description or drawings, when a component is indicated without specifying the RGB color, it is simply written as “colored layer 6”, and when the component is indicated by distinguishing the RGB color, For example, it is written as “colored layer 6R”. The RGB sub-pixels SG have colored layers 6R, 6G, and 6B, respectively. The colored layers 6R, 6G, and 6B function as color filters for the respective colors. The common electrode 8 is made of a transparent conductive material such as ITO like the pixel electrode, and is formed over substantially the entire surface of the color filter substrate 92. The common electrode 8 is electrically connected to one end side of the wiring 36 in the corner area E1 of the sealing material 5, and the other end side of the wiring 36 is electrically connected to an output terminal corresponding to the COM of the driver IC 40. It is connected to the.

Next, the lighting device 10 will be described. The lighting device 10 includes a light guide plate 11 and a light source unit 12. The light source unit 12 emits light L to the end surface 11 c of the light guide plate 11. As will be described in detail later, the light source unit 12 includes a plurality of LEDs (Light Emitting Diodes) 13 as light sources. The LED 13 is composed of RGB three-color LEDs 13R, 13G, and 13B. If the amount of current supplied to the LED 13 is increased, the emission intensity of light emitted from the LED 13 is increased. If the amount of current supplied to the LED 13 is decreased, the emission intensity of light emitted from the LED 13 is decreased. In addition, as an RGB light source in the illuminating device 10, the following are preferable.
・ B is the wavelength peak of emitted light at 435 nm to 485 nm ・ G is the wavelength peak of emitted light at 520 nm to 545 nm ・ R is the wavelength peak of emitted light at 610 nm to 650 nm The case where transmissive display is performed in the liquid crystal device 100 will be described. As shown in FIG. 2, the light L emitted from the light source unit 12 enters the light guide plate 11 through an end surface (hereinafter referred to as “light incident end surface”) 11 c of the light guide plate 11, and the output surface 11 a of the light guide plate 11. The direction is changed by repeating the reflection on the reflecting surface 11b. The light L is emitted from the emission surface 11a of the light guide plate 11 toward the liquid crystal display panel 30 when the angle formed between the emission surface 11a of the light guide plate 11 and the light L exceeds a critical angle.

  The light L emitted from the emission surface 11 a of the light guide plate 11 toward the liquid crystal display panel 30 passes through the liquid crystal display panel 30. The liquid crystal device 100 is illuminated by the light L passing through the liquid crystal display panel 30. Thereby, the liquid crystal device 100 can display images such as letters, numbers, and figures, and an observer can visually recognize the images.

  In the liquid crystal device 100, based on the signal and power from the FPC 41 side connected to the main board or the like of the electronic device, the driver IC 40 causes G1, G2,..., Gm-1, Gm (m is a natural number) in this order. The gate lines 33 are selected one by one in order, and a gate signal of a selection voltage is supplied to the selected gate line 33, while a non-selection voltage is supplied to the other non-selection gate lines 33. The gate signal is supplied. Then, the driver IC 40 applies source signals corresponding to display contents to the pixel electrodes 34 located at positions corresponding to the selected gate lines 33, respectively, corresponding S1, S2,..., Sn-1, Sn ( n is a natural number) and is supplied through the α-TFT element 37. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the liquid crystal device 100 is switched to the non-display state or the intermediate display state.

  The liquid crystal display panel 30 uses the α-TFT element 37 as a switching element. However, the present invention is not limited to this, and a polysilicon TFT or a TFD (Thin Film Diode) element may be used instead.

  The liquid crystal display panel 30 is not limited to a liquid crystal display panel having a liquid crystal layer made of TN liquid crystal as described above. Instead, a VA (Vertical Alignment) method, an IPS (In Plane Switching) method, an FFS (Fringe) is used. It is also possible to use a liquid crystal display panel such as a field structure.

(White adjustment in RGB LEDs)
As described above, when transmissive display is performed in the liquid crystal device 100, color display is performed by transmitting the white light emitted from the illumination device 10 through the color filter.

  FIG. 3A shows a spectral distribution of light of a general lighting device having LEDs of RGB colors. In FIG. 3A, the horizontal axis represents the wavelength [nm] of light, and the vertical axis represents the relative emission intensity [%]. The light of each color of RGB is emitted from the LED of each color. Therefore, as shown in the graph of FIG. 3A, the light of the illumination device having the LEDs of each color of RGB has a peak wavelength for each color. In a liquid crystal device having such a backlight, white light is generated by mixing light emitted from RGB LEDs.

  FIG. 3B shows the transmittance of each of the RGB color filters. In FIG. 3B, the horizontal axis indicates the light wavelength [nm], and the vertical axis indicates the transmittance [%]. As shown in FIG. 3B, the transmittance of each RGB color filter has the property that the transmittance is highest in the wavelength range of each RGB color. Therefore, in the liquid crystal device, when displaying each color of RGB, it is possible to perform color display by transmitting only light in which the colored layer of each color is in the wavelength range of each color.

  In the liquid crystal device as described above, the emission intensity of each color LED of RGB decreases with the passage of time, and the speed of the decrease varies depending on the LED for each color. For this reason, the white balance on the display screen of the liquid crystal device collapses with the passage of time.

  4 (a) and 4 (b) are diagrams showing changes in light emission intensity with respect to the lapse of time of LEDs of RGB colors, with the horizontal axis indicating time and the vertical axis indicating relative light emission intensity. Graphs 201Ra, 201Ga, and 201Ba in FIG. 4A respectively indicate the relative light emission intensities with respect to the passage of time of the LEDs of each color of RGB. From the graphs 201Ra, 201Ga, and 201Ba, it can be seen that the light emission intensity of light of B color decreases most rapidly and the light emission intensity of light of R color decreases most slowly with time. The reason why the light emission intensity of the B color light decreases most rapidly is that the energy of the B color light is the highest compared to the light energy of the other R and G colors. This is because the deterioration rate of the chip emitting light is faster than the deterioration rate of the other chips emitting R and G light.

  The graphs 201Rb, 201Gb, and 201Bb in FIG. 4B are obtained when the amount of current supplied to the RGB LEDs is increased at a constant rate from the amount of current supplied to the RGB LEDs in FIG. 4A. Shows the relative light emission intensity with respect to the passage of time of the LEDs of each color of RGB. Comparing FIG. 4A and FIG. 4B, for example, comparing the graph 201Ba and the graph 201Bb, when the amount of current flowing through the LEDs of each color of RGB is increased, the light of each color over time It can be seen that the rate of decrease in emission intensity increases. This is because increasing the amount of current increases the light emission intensity, so that the energy of the light also increases.

  In the liquid crystal device 100 according to the present embodiment, the light emission intensity of the light color whose light emission intensity decreases with time is set to be smaller, and the light emission intensity of the light color whose light emission intensity decreases is slower. It is set large. That is, the amount of current supplied to the light-colored LED 13 whose light emission intensity is decreased is set to be smaller, and the amount of current supplied to the light-colored LED 13 whose light emission intensity is decreased is set to be larger. Specifically, in the liquid crystal device 100, the light emission intensity of the LED 13B is set to the lowest, and the light emission intensity of the LED 13R is set to the highest. That is, the amount of current supplied to the LED 13B is set to be the smallest, and the amount of current supplied to the LED 13R is set to be the largest. As can be seen from FIG. 4, the decrease in the emission intensity with respect to the lapse of time of the light of B color is significant compared to the decrease in the emission intensity with the lapse of time of the light of R and G colors. The amount of current supplied is set to be particularly smaller than the amount of current supplied to the R and G LEDs 13. By doing in this way, the speed at which the emission intensity of the light emitted from the LEDs 13 for each color of RGB decreases with the passage of time can approach the same speed for each color. Thereby, the light which mixed the light radiate | emitted from LED13 of each color of RGB can maintain fixed chromaticity with progress of time.

  The light obtained by mixing the light emitted from the LEDs 13 for the respective colors RGB can maintain a constant chromaticity over time, but the light of the R color component is strong and the B color component. The light becomes weak, so it will not be white light.

  Therefore, in the liquid crystal device 100 according to the present embodiment, as described above, the area of the sub-pixel SG of each color is the largest in the B sub-pixel SG (B), and the area of the R sub-pixel SG (R) is the largest. It is set small. In each color sub-pixel, light is not transmitted through the portion where the switching element is provided. Therefore, exactly, the area of the transmission region through which light emitted from the illumination device 10 in the sub-pixel corresponding to each color is transmitted is light emission. A light color sub-pixel having a faster rate of decrease in intensity is set to be larger, and a light color sub-pixel having a slower rate of decrease in emission intensity is set to be smaller. Therefore, in one display pixel AG, the area of the transmissive region of the R sub-pixel SG (R) is set to the smallest, and the area of the transmissive region of the B sub-pixel SG (B) is set to the largest. FIG. 5 shows a schematic plan view of one display pixel AG. In FIG. 5, the transmissive region in each color sub-pixel is indicated by a broken line.

  In this way, when the light emitted from the illumination device 10 passes through the liquid crystal display panel 30, the light transmission amount of the R color is minimized and the light transmission amount of the B color is reduced. You can do the most. Therefore, the liquid crystal device 100 transmits the light emitted from the illumination device 10, which has strong light of the R color component and weak light of the B color component, to the liquid crystal display panel 30. , Close to white light. By doing as described above, the liquid crystal device 100 can keep the chromaticity of light emitted from the lighting device 10 constant over time and transmit the light to the liquid crystal display panel 30. Thus, it can be close to white light. That is, the liquid crystal device 100 can suppress the white balance on the display screen from being lost over time.

  Next, the relationship between the amount of current supplied to each color LED 13 and the area of the transmission region of each color sub-pixel will be described in detail. FIG. 6 shows the color reproduction range of the liquid crystal device 100 according to the present embodiment on the chromaticity diagram of the International Commission on Illumination (CIE).

  A color reproduction range 401 is a color reproduction range based on the wavelength sensitivity characteristics of human eyes, and indicates a color reproduction range that can be recognized by humans. A color reproduction range 402 indicates a color reproduction range that can be reproduced by a display device of the NTSC (National Television System Committee) system.

  In the color reproduction range 501, the ratio of the amount of current supplied to the LEDs 13 of each color is set to R: G: B = 20: 3.5: 1, and the area ratio of the transmission regions of the sub-pixels of each color is R: G: B. The color reproduction range by the liquid crystal device 100 when set to 12: 30: 100 is shown. The color reproduction range 501 includes R chromaticity coordinates (X, Y) = (0.664, 0.307) indicated by a point 501R and G chromaticity coordinates (X, Y) = (0.217) indicated by a point 501G. 0.650) and B chromaticity coordinates (X, Y) = (0.135, 0.097) indicated by a point 501B, and the NTSC ratio is 86.98 [% It has become. The chromaticity coordinates of the white point at this time are chromaticity coordinates (X, Y) = (0.31, 0.33) indicated by the point Wa.

  Since the color temperature is 6500 [K], the point Wa is also called D65 and is an ideal white point. That is, the liquid crystal device 100 sets the ratio of the current supplied to the LEDs 13 of each color of RGB to R: G: B = 20: 3.5: 1, and sets the area ratio of the transmission regions of the sub-pixels of each color to R : By setting G: B = 12: 30: 100, the white balance on the display screen can be prevented from being lost over time, and the white point can be made an ideal white point. . That is, the chromaticity of white (W) obtained by multiplying the emission luminance corresponding to the amount of current flowing through the LED 13 of each color by the spectrum of the RGB colored layer 6 and multiplying the aperture ratios of the RGB sub-pixels SG. The X coordinate is set to be in the range of 0.28 to 0.34, and the Y coordinate is set to be in the range of 0.28 to 0.37.

[Other examples]
In the above description, three colors of RGB have been described as the color (colored region) of the colored layer functioning as a color filter. However, the application of the present invention is not limited to this, and four colored layers, that is, four colors are used. One display pixel can be constituted by a colored region. In this case, as a light source in the illumination device, it is necessary to use four-color LEDs having colors corresponding to the four-color colored layers of the color filter of the liquid crystal display panel.

  Specifically, the four colored areas are blue colored areas (also referred to as “first colored areas”) in a visible light area (380 to 780 nm) in which the hue changes according to the wavelength. A colored region having a red hue (also referred to as a “second colored region”) and two colored regions selected from hues from blue to yellow (“third colored region”, “fourth colored region”). Also called “colored region”. Here, the term “system” is used. For example, if it is a blue system, the color is not limited to a pure blue hue, and includes a blue-violet color, a blue-green color, and the like. If it is a red hue, it is not limited to red but includes orange. These colored regions may be composed of a single colored layer, or may be composed of a plurality of colored layers having different hues. In addition, although these colored regions are described in terms of hue, the hue can be set by changing the saturation and lightness as appropriate.

The specific hue range is
-The colored region of the blue hue is from violet to blue-green, more preferably from indigo to blue.
-The colored region of red hue is from orange to red.
-One coloring area | region selected by the hue from blue to yellow is blue to green, More preferably, it is blue green to green.
-The other coloring area | region selected by the hue from blue to yellow is green to orange, More preferably, it is green to yellow. Or it is green to yellowish green.

  Here, the same hue is not used for each colored region. For example, when a green hue is used in two colored regions selected from hues of blue to yellow, the other uses a blue or yellowish green hue for one green.

  Thereby, a wider range of color reproducibility than the conventional RGB colored region can be realized.

In the above, a wide range of color reproducibility by the colored areas of four colors has been described in terms of hue, but as another specific example, it can be expressed as follows with the wavelength of light transmitted through the colored areas.
The blue colored region is a colored region having a wavelength peak of light transmitted through the colored region at 415 to 500 nm, preferably at 435 to 485 nm.
The red colored region is a colored region having a wavelength peak of light transmitted through the colored region of 600 nm or more, and preferably a colored region of 605 nm or more.
-One colored region selected by hue from blue to yellow is a colored region having a wavelength peak of 485-535 nm of light transmitted through the colored region, preferably a colored region having a wavelength of 495-520 nm. .
The other colored region selected with a hue from blue to yellow is a colored region having a wavelength peak of light transmitted through the colored region of 500-590 nm, preferably 510-585 nm, or 530- This is a colored region at 565 nm.

  In the case of transmissive display, this wavelength is a numerical value obtained by illuminating light from the illumination device through the color filter. In the case of reflective display, the value is obtained by reflecting external light.

As another specific example, when a colored region of four colors is expressed by an x, y chromaticity diagram, it is as follows.
The blue colored region is a colored region where x ≦ 0.151 and y ≦ 0.200, preferably a colored region where 0.134 ≦ x ≦ 0.151 and 0.034 ≦ y ≦ 0.200.
The red colored region is a colored region satisfying 0.520 ≦ x and y ≦ 0.360, and preferably a colored region satisfying 0.550 ≦ x ≦ 0.690 and 0.210 ≦ y ≦ 0.360.
-One of the colored areas selected in hues from blue to yellow is a colored area where x ≦ 0.200 and 0.210 ≦ y, preferably a colored area where 0.080 ≦ x ≦ 0.200 and 0.210 ≦ y ≦ 0.759 is there.
-The other colored region selected with a hue from blue to yellow is a colored region in the range of 0.257 ≦ x, 0.450 ≦ y, preferably a colored region in the range of 0.257 ≦ x ≦ 0.520, 0.450 ≦ y ≦ 0.720 is there.

  In the case of transmissive display, the x, y chromaticity diagram is a numerical value obtained by illuminating light from the illumination device through the color filter. In the case of reflective display, the value is obtained by reflecting external light.

  These four colored areas can be applied within the above-described range when the sub-pixel includes a transmission area and a reflection area.

Specific examples of the configuration of the above four colored regions include the following.
・ Colored areas of red, blue, green and blue-green ・ Colored areas of red, blue, green and yellow ・ Colored areas of red, blue, dark green and yellow ・ Hue is red, blue, Emerald green, yellow coloring area Hue is red, blue, emerald green, yellow green coloring area / hue is red, blue, dark green, yellow green coloring area Hue is red, blue green, dark green, yellow green Coloring area
[Electronics]
Next, an embodiment in which the liquid crystal device according to the present embodiment is used as a display device of an electronic apparatus will be described.

  First, an example in which the liquid crystal device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 7A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal device 100 according to the present invention is applied.

  Next, an example in which the liquid crystal device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 7B is a perspective view showing the configuration of the mobile phone. As shown in the figure, the mobile phone 720 includes a plurality of operation buttons 721, a reception port 722, a transmission port 723, and a display unit 724 to which the liquid crystal device 100 according to the present invention is applied.

  Note that, as an electronic device to which the liquid crystal device 100 according to the present invention can be applied, in addition to the personal computer shown in FIG. 7A and the mobile phone shown in FIG. Monitor direct-view video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, videophones, POS terminals, digital still cameras, etc.

It is a top view of the liquid crystal device concerning this embodiment. It is sectional drawing of the liquid crystal device which concerns on this embodiment. It is a figure which shows the characteristic of a color filter and RGB LED. It is a figure which shows the change of the emitted light intensity with progress of time of LED of each color of RGB. It is a top view which shows the structure of a display pixel. It is a chromaticity diagram showing the color reproduction range of the liquid crystal device according to the present embodiment. It is a figure which shows the example of the electronic device to which the liquid crystal device of this embodiment is applied.

Explanation of symbols

  12 light source unit, 13 LED, 10 illumination device, 30 liquid crystal display panel, 100 liquid crystal device

Claims (3)

An illuminating device having a plurality of light sources each emitting different colored light and having a reduced light emission intensity of each colored light over time;
A sub-pixel corresponding to each color, and a liquid crystal display panel having a transmission region in the sub-pixel that transmits the light emitted from the illumination device.
The current value of the light source that emits each color light is set to be smaller as the light whose emission intensity decreases is faster, and is set to be larger as the light whose emission intensity decreases is slower,
The area of the transmissive region of the sub-pixel corresponding to each color is set larger as the light-color sub-pixel having a faster light emission intensity decrease rate, and the light color sub-pixel having a lower light-emission intensity decrease rate. A liquid crystal device characterized by being set to be as small as possible. The plurality of light sources are light sources that emit light of each color of RGB, and the emission intensity of the light of each color of RGB is set such that the light of B is the smallest and the light of R is set the largest,
2. The liquid crystal device according to claim 1, wherein the area of the transmissive region of the sub-pixel corresponding to each color is set such that the B sub-pixel is set to be the largest and the R sub-pixel is set to be the smallest. .   An electronic apparatus comprising the liquid crystal device according to claim 1 or 2 in a display unit.

Images