JP2007101669A - Display device, lighting device, and display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily adjust, without affecting other properties, a color which a user finds preferable so as to achieve faithful reproduction of colors, such as flesh color. <P>SOLUTION: The display device comprises a display section wherein an image display range is divided into a plurality of areas and the respective divided areas 31-34 are displayed with different color temperatures; a drive circuit section which adjusts the respective divided areas 31-34 of the display section into prescribed color temperatures, respectively; an operation section for the user to select a desired divided area from among the respective divided areas 31-34 of the display section; and a control section which detects a signal from a color temperature selection section and controls the drive circuit section so that the whole image display range is displayed in the color temperature of the selected divided area. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device, a lighting device, and a display method suitable for application to a liquid crystal display device including a lighting device such as a backlight device.

  In the current display device (display), the standard color temperature is D65 (around 6500K), which is close to sunlight, but a higher color temperature is preferred because it is clearly visible, so a television receiver (hereinafter "TV") is preferred. Some of them have a high color temperature of 9000 K or higher.

  The color temperature refers to the change in the wavelength distribution of light emitted when a complete radiator (black body) is heated, and the color is expressed by the temperature of the same complete radiator (black body). . The unit is Kelvin (K). FIG. 13 shows a CIE chromaticity diagram showing the relationship between the color temperature and the chromaticity point. The horseshoe-shaped line 100 connects the points with a saturation of 100% from about 400 nm (blue) to about 800 nm (red) in wavelength. Saturation decreases as it gathers in the horseshoe shape, and becomes a white region at a position where the RGB energy distribution is balanced.

  Colors appear reddish when the color temperature is low and appear bluish when the color temperature is high. For example, if the color temperature is different, such as 5000K (warm white), 6500K (daylight), 9000K (cold white), the same white looks quite different.

  By the way, how people see colors varies widely, and each person has a preferred color. The most prominent examples are colors called memory colors, such as human skin color, blue sky, and green grass. Statistical studies have shown that these colors look different depending on the region and age.

  The central white chromaticity point is important to faithfully reproduce the colors including the memory color. Current television monitors and PC (personal computer) monitors use the sRGB space as the standard color space, but the white point (white point) is based on D65 (6500K). That is, as shown in FIG. 14, the white point 101 and the color reproduction range 102 of the monitor are determined in advance.

  However, in the case of a liquid crystal display television receiver (hereinafter referred to as “liquid crystal television”), the actual color temperature is very high at 9000 K or more in order to produce a clear color, and if the standard white point is different, Of course, the color of the looks different.

  In general, there are three main image quality modes for LCD TVs: dynamic mode (for store display) with saturation enhancement, natural mode for normal saturation, and custom mode for users to set hue (hue) and brightness. However, there is no LCD TV that uses an ordinary CCFL (Cold Cathode Fluorescent Lighting) light source as a backlight to easily set the color temperature. In the CCFL light source, since the spectral distribution of the light source cannot be changed, the color temperature cannot be freely controlled on the backlight side.

  For example, a projector, a liquid crystal monitor for PC, or a portable display can adjust the white point to some extent by slightly changing the RGB ratio by using the shutter function of the liquid crystal panel side, that is, the liquid crystal. Since all white adjustment is performed at the ratio of additive color mixture depending on the degree of openness, when a large white temperature change is required, the luminance change (loss) is increased, which affects the contrast characteristics.

  On the other hand, with the development of blue light emitting diodes, light emitting diodes that emit red light, green light, and blue light, which are the three primary colors of light, have been prepared, and red light, green light, and blue light emitted from these light emitting diodes have been prepared. By mixing light, white light with high color purity can be obtained. Therefore, by using this light emitting diode as the light source of the backlight device, the color purity through the liquid crystal display panel is increased, so that the color reproduction range can be greatly expanded compared with the CCFL. Furthermore, the brightness of the backlight device can be significantly improved by using a high-output light-emitting diode chip (LED chip).

  A backlight device using such a light emitting diode, for example, a direct type, that is, a backlight device in which the light emitting diode is disposed directly below the light emitting surface has been proposed (see, for example, Non-Patent Document 1).

An example of a backlight device using a light emitting diode as a light source is shown in FIG. In the backlight device 110 shown in FIG. 15, the red light emitting diode 110R, the green light emitting diode 110G, and the blue light emitting diode 110B are repeatedly arranged in the horizontal direction as an example, and the horizontal columns 111 to 118 are arranged in the vertical direction. It is an arrangement. The light emitting diodes in each column 111 to 118 and the drive circuit 120 are connected by a cord 119 composed of three phases of RGB. In this way, all the light emitting diodes of RGB colors are controlled by one drive circuit 120.
Nikkei Electronics (Nikkei BP), December 20, 2004 (No. 889), pages 123-130

  By the way, the thing of a nonpatent literature 1 uses a temperature sensor and a color sensor (colorimeter), and adjusts the drive current of each color LED based on those detection results, and white chromaticity of a backlight apparatus. Is controlled to a predetermined constant value. However, it is only controlled so as to have a preset white chromaticity, and the user cannot display it at a favorite color temperature.

  Also, as shown in FIG. 15, the conventional backlight device has a problem that it is difficult for the user to notice a subtle change in color temperature because the spectral intensity of the light emitting diode is controlled on one side. .

  The present invention has been made in view of the above points, and in order to obtain a faithful color reproduction such as skin color, the user can easily adjust a color that is considered preferable without affecting other characteristics. The purpose is to do.

  In order to solve the above problems, a display device of the present invention includes a display unit that divides an image display range into a plurality of parts and displays each divided region at a different color temperature, and each divided region of the display unit has a predetermined color temperature. The drive circuit unit to be adjusted to, the color temperature selection unit for the user to select a desired divided region from among the divided regions of the display unit, and a signal from this color temperature selection unit is detected and selected. And a control unit that controls the drive circuit unit so that the entire image display range is displayed at the color temperature of the divided area.

  According to the above configuration, the color temperature of the divided area can be easily changed so that the user can set a favorite color in advance. Since a plurality of different color temperatures are displayed on the same screen, the user can select a color temperature display that seems to be optimal while comparing a plurality of different color temperature screens on the same screen.

  In addition, the illumination device of the present invention divides an image display range into a plurality of images, displays each divided region at a different color temperature, and illuminates a liquid crystal panel used in a display device that allows a user to select a desired divided region. A plurality of light sources individually arranged corresponding to each divided region set by dividing the image display range into a plurality, and a drive circuit for independently driving the plurality of light sources for each divided region And the plurality of light sources emit light independently for each divided region based on a drive signal from the drive circuit unit.

  According to the said structure, an illuminating device can be divided | segmented into a some area | region, and the illumination light which has a different light emission characteristic for every division area can be radiate | emitted.

  The display method of the present invention is a display method for displaying the display unit at a color temperature desired by the user, and divides the image display range of the display unit into a plurality of parts and sets the divided areas at different color temperatures. And displaying a signal that is input when the user selects a desired divided area from among the plurality of divided areas, and displaying the entire image display range at the color temperature of the selected divided area. And

  According to the above configuration, the user can set white that seems to be optimal while displaying and comparing a plurality of different color temperatures on the same screen.

  According to the present invention, a plurality of different color temperatures can be displayed on the same screen, and the user can set a color temperature that seems to be optimal while comparing them. Adjustment can be performed easily and without affecting other characteristics, and faithful colors such as skin color can be easily reproduced.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  In this example, the display device of the present invention is applied to a transmissive liquid crystal display device. First, a configuration example of the entire liquid crystal display device will be described with reference to FIGS. FIG. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a schematic exploded view of a liquid crystal display device according to an embodiment of the present invention. As shown in FIG. 1, the liquid crystal display device of this example is roughly divided into a backlight device 5 using a light emitting diode (LED) as a light source, a TFT (Thin Film Transistor) array substrate 1, a liquid crystal layer 2, and a color filter 3. And a liquid crystal panel (LCD panel) 4 including The backlight device 5 is installed on the back surface of the liquid crystal panel (display unit) 4. Although not shown, generally, a light guide plate and a diffusion plate are disposed between the liquid crystal panel 4 and the backlight device 5, and a reflective sheet is disposed on the bottom surface of the backlight device 5.

  The color filter 3 has a configuration having spectral characteristics corresponding to the color configuration of the LED of the backlight device 5. Then, in order to separate the white light mixed in the backlight device 5 into red (R), green (G), and blue (B) again, a blue filter is formed on the TFT array substrate 1 and the liquid crystal layer 2 corresponding to the pixels. 3B, green filter 3G, and red filter 3R are arranged.

  The colorimeter 6 described above the liquid crystal panel 4 in FIG. 1 is used for setting the white color temperature of the liquid crystal display device described later.

  Here, a schematic configuration of the backlight device 5 is shown in FIG. FIG. 3A shows an arrangement example of each color LED on the backlight device, and FIG. 3B is a schematic cross-sectional view at an arbitrary position of the backlight device. As shown in FIG. 3A, the backlight device 5 includes backlights 21, 22, 23, and 24 of each region divided into four.

  As the light source, a red light emitting diode 5R, a green light emitting diode 5G, and a blue light emitting diode 5B are used, and a plurality of light emitting diodes of each color are arranged in a row in a predetermined order on the substrate of the backlight device 5, thereby producing a light emitting diode unit. Is formed. Each color light emitting diode is controlled to be white by mixing each color. The light emitted from each light emitting diode becomes uniform light by a diffusion plate or a light guide plate (not shown) and enters the back surface of the liquid crystal panel 4.

  The order in which the light emitting diodes are arranged on the substrate is as shown in FIG. 3A, the most basic arrangement method using red light emitting diodes 5R, green light emitting diodes 5G, and blue light emitting diodes 5B as repeating units, although not shown. For example, there are various arrangement methods such as an order in which the green light emitting diodes 5G are arranged at equal intervals, and the red light emitting diodes 5R and the blue light emitting diodes 5B are alternately arranged between the adjacent green light emitting diodes 5G.

  FIG. 4 is a diagram illustrating an example of a block configuration of the liquid crystal display device. This liquid crystal display device includes a liquid crystal panel control circuit 11 to which a video signal is supplied via an input terminal 10 a, a liquid crystal panel 4 to which an output of the liquid crystal panel control circuit 11 is supplied, and a color temperature changeover switch (operation unit) 12. A backlight control circuit (control unit) 13 to which an output of the color temperature changeover switch 12 and a color temperature adjustment signal input via the input terminal 10b are supplied, and an output of the backlight control circuit 13 are supplied. Data is read and written by the drive circuits 15, 16, 17, 18, the backlights 21, 22, 23, 24 supplied with the outputs of the drive circuits 15, 16, 17, 18, respectively, and the backlight control circuit 13. And a memory 14 to be performed.

  The liquid crystal panel control circuit 11 detects, for example, a horizontal synchronizing signal or a vertical synchronizing signal from a video signal input through the input terminal 10a (hereinafter referred to as “input video signal”), and detects the detected horizontal synchronizing signal or A timing signal necessary for screen display is generated in synchronization with the vertical synchronization signal, and an input video signal is converted into an RGB signal that matches the characteristics of the liquid crystal panel 4. Then, the liquid crystal panel control circuit 11 supplies timing signals necessary for screen display and adjusted RGB signals to the TFT array substrate 1 of the liquid crystal panel 4 (see FIG. 1). The liquid crystal panel control circuit 11 supplies a lighting control signal to the backlight control circuit 13.

  The liquid crystal panel 4 displays an image based on the RGB signal supplied from the liquid crystal panel control circuit 11 simultaneously with the timing signal based on the timing signal supplied from the liquid crystal panel control circuit 11. It is assumed that the voltage applied to the liquid crystal panel 4 at this time is set to an optimum value.

  In this example, since the drive circuits 15, 16, 17, and 18 are provided for the backlights 21, 22, 23, and 24, the lighting of the backlights 21, 22, 23, and 24 is independently controlled. Is possible. Thereby, the image display range of the liquid crystal display panel can be divided into a plurality of parts, and each divided area can be displayed at a different color temperature.

  An example of the connection form of each of the backlights 21, 22, 23, 24 and each of the drive circuits 15, 16, 17, 18 is shown in FIG. As described with reference to FIG. 3, the backlight device 5 is divided into four regions, and the light emission of each color light emitting diode, that is, the color temperature of the backlight is controlled in each divided region. The arrangement of the light emitting diodes of each color in each divided region is not limited to this example, and various arrangements are conceivable.

  First, in the divided region 21 of the backlight device 5, the red light emitting diode 5R, the green light emitting diode 5G, and the blue light emitting diode 5B are repeatedly arranged in the horizontal direction as an example, and the horizontal columns 21a to 21d are arranged in the vertical direction. It is an arrangement. The light emitting diodes in each of the columns 21a to 21d and the driving circuit 15 are connected by a code 21e composed of three phases of RGB, and the spectrum intensity is controlled for each of the light emitting diodes of each color of RGB.

  Similarly, in the divided region 22 of the backlight device 5, the light emitting diodes 5R, 5G, and 5B of the respective colors are repeatedly arranged in the horizontal direction as an example, and the horizontal rows 22a to 22d are arranged in the vertical direction. ing. The light emitting diodes in each of the columns 22a to 22d and the drive circuit 16 are connected by a code 22e composed of three phases of RGB, and the spectrum intensity is controlled for each of the light emitting diodes of each RGB color.

  Similarly, in the divided region 23 of the backlight device 5, the light emitting diodes 5R, 5G, and 5B of each color are repeatedly arranged in the horizontal direction as an example, and the horizontal rows 23a to 23d are arranged in the vertical direction. It has become. The light emitting diodes in each of the columns 23a to 23d and the driving circuit 17 are connected by a code 23e composed of three phases of RGB, and the spectrum intensity is controlled for each of the light emitting diodes of each RGB color.

  Similarly, in the divided region 24 of the backlight device 5, the light emitting diodes 5R, 5G, 5B of the respective colors are repeatedly arranged in the horizontal direction as an example, and the horizontal rows 24a to 24d are arranged in the vertical direction. It has become. The light emitting diodes in each of the columns 24a to 24d and the drive circuit 18 are connected by a code 24e composed of three phases of RGB, and the spectrum intensity is controlled for each of the light emitting diodes of each RGB color.

  The color temperature changeover switch 12 described above functions as an operation unit for the user to select a divided area displayed at a preferred color temperature from among a plurality of divided areas displayed at different color temperatures. For example, in a color temperature selection mode in which a user's favorite color temperature can be selected, each divided area is displayed at a different color temperature, and the user selects a certain divided area on the display screen, so that the color temperature of the selected divided area is displayed. Is supplied to the backlight control circuit 13. Then, a control signal based on the color temperature information is supplied from the drive circuits 15 to 19, and the same drive signal (drive current) corresponding to the color temperature information of the divided area is supplied to all the divided areas 21, 22, 23, 24. Supplied to the light emitting diode, the entire screen of the liquid crystal display device can be displayed at the color temperature desired by the user.

  Further, a color temperature adjustment signal is input to the backlight control circuit 13 from the input terminal 10b when the user operates an operation unit (not shown), and the drive circuit for the corresponding divided area is controlled based on the color temperature adjustment signal. The

  As the color temperature changeover switch 12, for example, a remote operation device (so-called remote control) using infrared rays, a touch panel laminated on the liquid crystal panel 4, an operation button provided on the liquid crystal display device, or the like can be applied. The color temperature changeover switch 12 may be shared with an operation unit for generating a color temperature adjustment signal.

  FIG. 6 is an example of display by color temperature when the liquid crystal panel 4 is divided into four. In this example, the divided area 31 of the liquid crystal panel 4 is the divided area 21 of the backlight device 5, the divided area 32 of the liquid crystal panel 4 is the divided area 22 of the backlight device 5, and the divided area 33 of the liquid crystal panel 4 is the same. The divided area 23 of the backlight device 5 and the divided area 34 of the liquid crystal panel 4 correspond to the divided area 24 of the backlight device 5. As shown in FIG. 6, the divided areas 31, 32, 33, and 34 are displayed at color temperatures of 10000K, 8000K, 6500K, and 5000K, respectively.

  FIG. 7 shows an example of the spectral characteristics of the light-emitting diode used in this example. Red (R) has a peak wavelength of 640 nm, green (G) has a peak wavelength of 525 nm, and blue (B) has a peak wavelength of 450 nm. FIG. 7 shows spectral characteristics when light is emitted with 100% current input for all three colors of the light emitting diodes. Spectral characteristics were measured with a colorimeter 6 shown in FIG.

  Further, a color filter having spectral characteristics as shown in FIG. 8 was used. When the light emitting diodes of the three colors were each made to emit light at a current input of 100%, the light output in each color of the color filter 3 was measured and the ratio thereof was calculated. In this example, the transmittance was about 0.93 in the red (R) region, the transmittance was about 0.76 in the green (G) region, and the transmittance was about 0.64 in the blue (B) region.

  In FIG. 9, the backlight device was divided into four regions, and white colors were generated with the color temperatures at the respective divided region surfaces being 10,000K, 8000K, 6500K, and 5000K. That is, the color temperature difference is set to 1500 to 2000K step by step so that four types of color temperatures can be displayed. This white temperature was adjusted by changing only the spectral characteristics of the light emitting diodes of the respective colors in each divided region without changing the characteristics of the color filter 3.

  FIG. 9A shows a spectral spectral distribution of RGB light emitting diodes for producing a color temperature of 10000K. At this time, the drive current supplied from the drive circuit 15 was controlled so that the spectral characteristics of each light-emitting diode were 90% for blue (B), 52% for green (G), and 85% for red (R). .

  FIG. 9B is a spectral spectral distribution of RGB light emitting diodes for producing a color temperature of 8000K. At this time, the drive current supplied from the drive circuit 16 was controlled so that the spectral characteristics of each light emitting diode were 76% for blue (B), 52% for green (G), and 93% for red (R). .

  FIG. 9C is a spectral spectral distribution of RGB light emitting diodes for producing a color temperature of 6500K. At this time, the drive current supplied from the drive circuit 17 was controlled so that the spectral characteristics of each light emitting diode were 67% for blue (B), 52% for green (G), and 93% for red (R). .

  FIG. 9D is a spectral spectral distribution of RGB light emitting diodes for producing a color temperature of 5000K. At this time, the drive current supplied from the drive circuit 18 was controlled so that the spectral characteristics of each light-emitting diode were 50% for blue (B), 52% for green (G), and 110% for red (R). . As described above, the drive current supplied to each light emitting diode is controlled independently for each of the four surfaces of the divided region.

  Note that the spectral characteristics of the light emitting diodes of the three colors differ depending on the spectral characteristics of the light emitting diodes of the respective colors and the spectral characteristics of the color filters, so that the present invention is not limited to this example.

  FIG. 10 is a CIE chromaticity diagram showing the change of the white point with the color temperature. In FIG. 10, a horseshoe-shaped curve 45 is an sRGB color space, and each color reproduction range of a white point 49 at a white point 47,6500K at a white point 46,8000K at a color temperature of 10000K and a white point 49 at a white point 48,5000K. 51, 52, 53, and 54 are shown. It can be seen that the white point shifts to the red region (in the direction of the arrow 50) as the color temperature decreases. In the figure, WP means a white point.

  FIG. 11 shows the white temperature and the color reproduction range, where A is the red color range, B is the green color range, and C is the change in the blue color range. As the color temperature decreases, blue is in the green direction (arrow 57 in FIG. 11C), green is in the yellow direction (in the direction of arrow 56 in FIG. 11B), and red is deeper (higher saturation) in the red direction (in FIG. 11A). It can be seen that the color gamut is shifted to the arrow 55).

  As shown in FIG. 6, these color temperatures are generated by controlling the liquid crystal layer 2 after the illumination from the backlight device 3 is transmitted through the liquid crystal panel 4 to generate all white and dividing the image display surface into four parts. White colors with different color temperatures are displayed on the four sides, and the white color desired by the user can be determined while comparing. This solves the problem that the color appearance differs depending on the locality, age, etc., determines the color reproduction range that the user likes, and allows the user to view the video without a sense of incongruity.

  FIG. 12 is a flowchart illustrating color temperature setting processing performed by the liquid crystal display device. First, the user selects the color temperature selection mode from the menu screen of the liquid crystal display device, and displays the color temperature selection mode screen. That is, different predetermined drive currents are supplied from the drive circuits 15 to 18 to the divided regions 21 to 24 of the backlight device 5 corresponding to the divided screen, and the divided regions 21 to 24 of the backlight device 5 are different. Illuminate at the color temperature (step S1).

  The liquid crystal panel 4 is irradiated with illumination light from the divided regions 21 to 24 of the backlight device 5 and the liquid crystal layer 4 of the liquid crystal panel 4 is controlled to display the liquid crystal panel 4 in all white (step S2). As a result, the liquid crystal panel 4 performs white display of four-division display with different color temperatures, and allows the user to select the desired color temperature by comparing the color temperatures.

  The user operates the color temperature changeover switch 12 from among the liquid crystal panels 4 displayed in a divided manner to select a divided region (divided screen) displayed at a desired color temperature. The backlight control circuit 13 of the liquid crystal display device detects an input signal indicating the divided area selected by the user, and obtains color temperature information of the divided area (step S3).

  Next, based on the color temperature information corresponding to the input signal detected by the backlight control circuit 13, that is, the divided region selected by the user, a control signal is sent from the backlight control circuit 13 to each of the driving devices 15-18. The same drive current is supplied from the drive circuits 15 to 18 to the light emitting diodes of the respective colors in the divided regions 21 to 24 of the backlight device 5 according to the control signal (step S4).

  As a result, the divided regions 21 to 24 of the backlight device 5 emit light with the same spectral intensity, and the illumination light having the same light emission characteristics is irradiated to the liquid crystal panel 4. As a result, the full screen can be displayed at the color temperature selected by the user (step S5).

  As described above, according to the present invention, the white point can be easily changed on the backlight side so that the user can set a favorite color in advance. In the past, although the appearance was different depending on the regional characteristics and age of the user, the color temperature was determined to be constant, so that there were some images that did not look good for the user. Conventionally, correction is performed by looking at the color temperature of the entire display surface, that is, only one screen, and thus correction cannot be performed while comparing with other color temperatures. However, according to the present invention, the color temperature is controlled for each area on the backlight device side, and the user displays a plurality of different color temperatures in advance on the same screen for comparison, while the white color viewed by the user through the liquid crystal panel. By setting white that seems to be optimal among the colors, flesh color and other memory colors can be faithfully reproduced.

  In addition, since the light emitted from each color light emitting diode is an additive color mixture, the white point can be changed without losing light on the liquid crystal panel side.

  The color temperature selection mode is not selected from the menu screen by the user. For example, when the power of the liquid crystal display device is turned on, the color temperature selection mode may be displayed by dividing the display into four parts. Alternatively, the previous color temperature setting may be stored in the memory 14 before the power is turned on, the color temperature setting may be read when the power is turned on, and the entire screen may be displayed at the color temperature.

  In addition to displaying the four color temperatures that are stored and set in advance in the memory 14, the color temperature finely adjusted by the user is stored in the memory 14, and one color temperature candidate for the four-division display. Set to. Then, in the color temperature setting mode, one of the four divided displays may be displayed at the color temperature finely adjusted by the user.

  In addition, after the user selects a desired divided screen from a plurality of divided screens having different color temperatures by operating an operation unit that allows the user to finely adjust the color temperature, the user further finely adjusts the color temperature of the divided screen. You may be able to do it. Alternatively, after the user selects a divided screen, a color temperature fine adjustment signal is generated using a signal detected by a color sensor as described in Non-Patent Document 1, and the fine adjustment signal is input to the input terminal 10b. The color temperature may be finely adjusted by inputting the color temperature.

  In the above-described embodiment, the RGB light emitting diodes are used as the light source, but magenta, cyan, and yellow may be used. Furthermore, you may combine 4 colors, 5 colors, and 6 colors from these colors.

  Further, the present invention can be applied not only to a transmission type (backlight type) liquid crystal display device but also to a front light type, a semi-transmission type, a PDP (plasma display panel), and the like.

  Furthermore, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the scope of the present invention.

1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention. 1 is a schematic exploded view of a liquid crystal display device according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the backlight apparatus which concerns on one embodiment of this invention, A represents the example of arrangement | positioning of LED, B represents LED on a backlight apparatus. It is a figure which shows the schematic block structural example of the liquid crystal display device which concerns on one embodiment of this invention. It is a figure which shows the connection form of LED and a drive circuit in the backlight apparatus which concerns on the example of 1 embodiment of this invention. It is a figure which shows the panel display example (in the case of 4 divisions) according to color temperature which concerns on one embodiment of this invention. It is a figure which shows the example of the LED spectral characteristics used for the backlight apparatus which concerns on one embodiment of this invention. It is a figure which shows the example of the color filter spectral characteristics used for the liquid crystal display device which concerns on one embodiment of this invention. The LED spectral characteristics according to color temperature which concern on one embodiment of this invention are shown, A represents 10000K, B represents 8000K, C represents 6500K, D represents 5000K. It is a figure which shows the change of the white point by the color temperature which concerns on the example of 1 embodiment of this invention. It is a figure which shows the change of the color reproduction range by the color temperature which concerns on the example of 1 embodiment of this invention, A is a red area | region, B is a green area, C is an example which paid its attention to a blue area. 5 is a flowchart of color temperature setting processing according to an embodiment of the present invention. It is the figure which showed the relationship between color temperature and a chromaticity point. It is a figure where it uses for description of the white point of a monitor, and a color reproduction range. It is a figure where it uses for description of the conventional backlight apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... TFT array substrate, 2 ... Liquid crystal layer, 3 ... Color filter, 3R ... Red filter, 3G ... Green filter, 3B ... Blue filter, 4 ... Liquid crystal panel, 5 ... Backlight device, 5R ... Red light emitting diode, 5G ... Green light emitting diode, 5B ... Blue light emitting diode, 11 ... Liquid crystal panel control circuit, 12 ... Color temperature changeover switch, 13 ... Backlight control circuit, 14 ... Memory, 15, 16, 17, 18 ... Drive circuit, 21,22 23, 24 ... (backlight) divided area 31, 32, 33, 34 ... (display panel) divided area, 46, 47, 48, 49 ... white point, 51, 52, 53, 54 ... color reproduction range

Claims (7)

A display unit that divides the image display range into a plurality of parts and displays each divided region at a different color temperature;
A drive circuit unit for adjusting each divided region of the display unit to a predetermined color temperature;
An operation unit for a user to select a desired divided region from among the divided regions of the display unit;
And a control unit that detects a signal from the operation unit and controls the drive circuit unit so that the entire image display range is displayed at the color temperature of the selected divided region. A storage unit for storing a color temperature setting when displaying each divided region of the image display range at a different color temperature;
The display device according to claim 1, wherein the control unit controls the drive circuit unit based on a color temperature setting of each divided region read from the storage unit. The display unit includes a liquid crystal panel, and includes light sources of a plurality of colors arranged individually corresponding to each divided region obtained by dividing the image display range of the display unit into a plurality of regions,
The drive circuit unit adjusts a drive signal for each of the plurality of light sources arranged corresponding to each divided region of the display unit based on a control signal from the control unit. Item 4. The display device according to Item 1. The multi-color light source comprises a multi-color light emitting diode,
4. The display device according to claim 3, wherein a white point obtained by mixing colors emitted by the light emitting diodes of the plurality of colors is adjusted by changing a combination of spectral intensities of the light emitting diodes. The display device according to claim 1, wherein the display unit is displayed with all white, and the user is allowed to select a divided region displayed at a favorite white temperature. An illumination device that illuminates a liquid crystal panel used in a display device that divides an image display range into a plurality of images, displays each divided region at a different color temperature, and allows a user to select a desired divided region,
A plurality of light sources individually arranged corresponding to each divided area set by dividing the image display range into a plurality of areas;
A drive circuit unit that drives the plurality of light sources independently for each of the divided regions;
The plurality of light sources emit light independently for each of the divided regions based on a drive signal from the drive unit. A display method for displaying a display unit at a color temperature desired by a user,
The image display range of the display unit is divided into a plurality of areas and each divided area is displayed at a different color temperature,
Detecting a signal input when the user selects a desired divided area from the plurality of divided areas,
A display method characterized by displaying the entire image display range at the color temperature of the selected divided area.

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