WO2013099722A1 - 表示装置および表示方法 - Google Patents
表示装置および表示方法 Download PDFInfo
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- WO2013099722A1 WO2013099722A1 PCT/JP2012/082877 JP2012082877W WO2013099722A1 WO 2013099722 A1 WO2013099722 A1 WO 2013099722A1 JP 2012082877 W JP2012082877 W JP 2012082877W WO 2013099722 A1 WO2013099722 A1 WO 2013099722A1
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- viewer
- emission luminance
- compensation value
- backlight
- luminance compensation
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
Definitions
- the present invention relates to a display device, and more particularly to a display device having a function of controlling the luminance of a backlight and a display method in the display device.
- a display screen is divided into a plurality of areas, and a display panel is driven while controlling the luminance of the backlight based on an image to be displayed in the area (hereinafter referred to as a display panel).
- a display panel is driven while controlling the luminance of the backlight based on an image to be displayed in the area.
- Area active drive is known. According to area active driving, it is possible to reduce the power consumption of the backlight and to improve the display image quality.
- halo is also called black float. It is generally known that this halo is more easily recognized when the display is viewed obliquely than when viewed from the front.
- FIG. 20 is a diagram for explaining a halo when viewed from the front of a liquid crystal display (hereinafter simply referred to as “display”) 200. More specifically, FIG. 20A is a diagram showing the position of the viewer 30 with respect to the central axis of the display 200 (referring to a normal line at the center of the display 200).
- FIG. 20B is a diagram illustrating a display example on the display 200.
- FIG. 21 is a diagram for explaining the halo when viewed from an oblique direction of the display 200. More specifically, FIG. 21A is a diagram showing the position of the viewer 30 with respect to the central axis of the display 200.
- FIG. 21B is a diagram showing a display example on the display 200. In FIG. 20B and FIG.
- FIG. 22 is a diagram showing the relationship between the viewing angle from the central axis of the display 200 and the light transmittance of the liquid crystal.
- G1 to G6 in FIG. 22 indicate the viewing angle characteristics of the liquid crystal for each gradation level of the input image, and the gradation level decreases from G1 to G6.
- FIGS. 21 (A) and 21 (B) when viewing from an oblique direction of the display 200, halo is relatively easily recognized.
- minimum emission luminance increase setting In order to suppress such a halo, a display device that has been set to increase the minimum emission luminance of the backlight to some extent (hereinafter referred to as “minimum emission luminance increase setting”) has been conventionally known. Since the luminance difference between the high luminance region and the low luminance region is reduced by performing the minimum emission luminance increase setting, it is difficult to recognize the halo.
- Patent Document 1 the color temperature of the user's eyes is registered in advance, the position of the user's eyes is specified by face recognition, and the current color temperature of the user's eyes is measured.
- a display device that adjusts the color of a display image based on the difference between the measured color temperature of a user's eye and the color temperature of a previously registered eye is disclosed.
- the minimum light emission luminance is set sufficiently high in advance in consideration of the maximum luminance difference between backlight areas that may occur and viewing from an oblique direction.
- the luminance distribution is made comparatively gentle by keeping them. Thereby, halo can fully be suppressed.
- the display device described in Patent Document 1 adjusts the color of a display image, and does not suppress halo in area active driving.
- an object of the present invention is to provide a display device and a display method that suppress halo while suppressing a decrease in contrast.
- a first aspect of the present invention is a display device having a function of controlling the luminance of a backlight, A display panel including a plurality of display elements; A backlight including a plurality of light sources; A viewer information acquisition unit for acquiring viewer information including at least information on the position of the viewer; A drive adjustment unit for obtaining information on brightness control of the backlight based on the viewer information; A drive processing unit that divides the input image into a plurality of areas and obtains the light emission luminance of the light source corresponding to each area based on the input image corresponding to each area and the information on the luminance control of the backlight; A backlight driving unit that outputs a signal for controlling the luminance of the light source to the backlight based on the emission luminance obtained by the driving processing unit; A panel driving unit that outputs a signal for controlling the light transmittance of the display element to the display panel based on at least information related to light transmission control of the display panel obtained from information related to the input image. And
- Information relating to the luminance control of the backlight includes a minimum emission luminance compensation value that indicates the lowest emission luminance of the backlight
- the drive processing unit corrects the light emission luminance of the backlight based on the minimum light emission luminance compensation value received from the drive adjustment unit.
- the drive adjustment unit obtains the minimum emission luminance compensation value based on the position of the viewer obtained from information on the position of the viewer.
- the viewer information further includes information on the number of viewers
- the drive adjusting unit is When the number of viewers is one, the individual minimum emission luminance compensation value indicating the minimum emission luminance of the backlight, which is determined according to the position of the viewer with respect to the viewer, is set as the minimum emission luminance compensation. As a value, When there are a plurality of viewers, the minimum emission luminance compensation value is obtained based on an individual minimum emission luminance compensation value for each viewer.
- each of the individual minimum emission luminance compensation value and the minimum emission luminance compensation value is set uniformly in all areas,
- the individual minimum emission luminance compensation value for the viewer is set according to the position of the viewer with respect to the center of the display panel.
- a sixth aspect of the present invention is the fifth aspect of the present invention,
- the minimum emission luminance compensation value is a maximum individual minimum emission luminance compensation value among individual minimum emission luminance compensation values for a plurality of viewers.
- a seventh aspect of the present invention is the sixth aspect of the present invention.
- the individual minimum emission luminance compensation value for the viewer is set so as to increase as the angle of the viewer's position with respect to the normal at the center of the display panel increases.
- each of the individual minimum emission luminance compensation value and the minimum emission luminance compensation value is set for each predetermined number of areas,
- the individual minimum emission luminance compensation value for each of the predetermined number of areas related to the viewer is set so as to increase as the predetermined number of areas become farther from the area in front of the viewer.
- a ninth aspect of the present invention is the eighth aspect of the present invention.
- the minimum emission luminance compensation value for each of the predetermined number of areas is the maximum of the individual minimum emission luminance compensation values for the predetermined number of areas for the plurality of viewers.
- the viewer information acquisition unit includes a camera that acquires an image of the viewer as the viewer information.
- An eleventh aspect of the present invention is the tenth aspect of the present invention.
- the drive adjustment unit finds at least the position of the viewer by detecting the face of the viewer from an image of the viewer and acquiring the position of the face with respect to the display panel. .
- a twelfth aspect of the present invention is the eleventh aspect of the present invention, Lighting to illuminate the viewer; An illumination luminance adjustment unit that adjusts the luminance of the illumination according to the brightness of the viewing environment is further provided.
- a thirteenth aspect of the present invention is the twelfth aspect of the present invention.
- the illumination brightness adjusting unit acquires brightness of the viewing environment from an image obtained by photographing the viewer.
- the drive processing unit further obtains information related to light transmission control of the display panel based on information related to an input image corresponding to each area and light emission luminance of a light source corresponding to each area.
- a fifteenth aspect of the present invention is a display method in a display device including a display panel including a plurality of display elements and a backlight including a plurality of light sources, and having a function of controlling the luminance of the backlight, Viewer information acquisition step of acquiring viewer information including at least information on the position of the viewer; Obtaining information on brightness control of the backlight based on the viewer information; A drive adjustment step of dividing the input image into a plurality of areas, and obtaining the light emission luminance of the light source corresponding to each area based on the input image corresponding to each area and information on the luminance control of the backlight; A backlight driving step for outputting a signal for controlling the luminance of the light source to the backlight based on the light emission luminance obtained in the driving processing step; A panel driving step of outputting a signal for controlling the light transmittance of the display element to the display panel based on at least information relating to light transmission control of the display panel obtained from information relating to the input image. And
- a sixteenth aspect of the present invention is the fifteenth aspect of the present invention.
- Information on the luminance control of the backlight includes a minimum emission luminance compensation value indicating the minimum emission luminance of the backlight,
- the light emission luminance of the backlight is corrected based on the minimum light emission luminance compensation value obtained in the drive adjustment step.
- a seventeenth aspect of the present invention is the sixteenth aspect of the present invention,
- the minimum emission luminance compensation value is obtained based on the position of the viewer obtained from information on the position of the viewer.
- the viewer information further includes information on the number of viewers,
- the individual minimum emission luminance compensation value indicating the minimum emission luminance of the backlight, which is determined according to the position of the viewer with respect to the viewer, is the minimum emission luminance compensation.
- the minimum emission luminance compensation value is obtained based on an individual minimum emission luminance compensation value for each viewer.
- each area is handled using information related to luminance control of a backlight obtained based on viewer information.
- the emission luminance of the light source is required.
- the information on the backlight luminance control includes the minimum emission luminance compensation value indicating the minimum emission luminance of the backlight, and the viewer position is obtained from the information on the viewer position included in the viewer information.
- the minimum emission luminance compensation value when the information related to the backlight luminance control includes the minimum emission luminance compensation value indicating the minimum emission luminance of the backlight, the minimum emission luminance compensation value is used.
- the minimum emission luminance compensation value By correcting the light emission luminance of the backlight, it is possible to obtain the same effect as that of the first aspect or the fifteenth aspect of the present invention.
- the minimum emission luminance compensation value is obtained based on the position of the viewer obtained from the information related to the position of the viewer. The same effect as in the sixteenth aspect can be obtained.
- the minimum emission luminance compensation value is obtained according to the case where there is one viewer and the case where there are a plurality of viewers. Halo can be suppressed while suppressing a decrease in contrast.
- the minimum emission luminance compensation value and the individual minimum emission luminance compensation value for each viewer are uniformly set in all areas. Therefore, the effect similar to the 4th aspect of this invention can be acquired by simple setting.
- the minimum emission luminance compensation value as the maximum individual minimum emission luminance compensation value among the individual minimum emission luminance compensation values for a plurality of viewers, the individual minimum emission luminance is obtained. Halo can be suppressed by focusing on the viewer with the maximum compensation value.
- the individual minimum emission luminance compensation value for the viewer increases as the position of the viewer with respect to the normal line at the center of the display panel increases.
- the individual minimum emission luminance compensation value that increases as the distance from the area in front of the viewer increases.
- the minimum light emission luminance compensation value is appropriately set in consideration of a front area corresponding to the position of the viewer (referred to as an area located in front of the viewer).
- the minimum emission luminance compensation value of each predetermined number of areas is set to the maximum individual minimum emission among the individual minimum emission luminance compensation values for the predetermined number of areas related to a plurality of viewers.
- the same effect as the third aspect or the fourth aspect of the present invention can be obtained by using an image of the viewer as viewer information.
- an effect similar to that of the tenth aspect of the present invention can be obtained by obtaining the position of the viewer from the position of the face obtained by face detection.
- the luminance of the illumination is increased when the environmental luminance is not sufficient for face detection, for example. can do. For this reason, it is possible to suppress a decrease in face detection accuracy.
- the brightness of the viewing environment is acquired from the image of the viewer, it is not necessary to separately provide a sensor or the like for acquiring the brightness of the viewing environment.
- the fourteenth aspect of the present invention not only information related to the input image corresponding to each area but also information related to light transmission control of the display panel is obtained based on the light emission luminance of the light source corresponding to each area.
- the light transmittance of each display element is obtained more accurately. Thereby, the image quality of the display image can be improved.
- FIG. 1 is a block diagram illustrating a configuration of a liquid crystal display device according to a first embodiment of the present invention. It is a figure which shows the detail of the backlight in the said 1st Embodiment. It is a block diagram which shows the detail of the area active unit in the said 1st Embodiment. It is a figure for demonstrating the installation position of the camera in the said 1st Embodiment. It is a figure for demonstrating the position of the viewer in the Y direction in the said 1st Embodiment. It is a figure for demonstrating the position of the viewer in the X direction in the said 1st Embodiment.
- (B) is a diagram schematically showing an individual minimum emission luminance compensation value of each area corresponding to the AA line in (A). It is a figure for demonstrating the setting of the separate minimum light emission luminance compensation value regarding the viewer with comparatively large viewing angle (epsilon).
- (A) is a figure which shows the example of a display in a liquid crystal panel.
- (B) is a diagram schematically showing an individual minimum emission luminance compensation value of each area corresponding to the AA line in (A). It is a flowchart which shows operation
- (A) is a figure which shows the setting of the separate minimum light emission brightness compensation value regarding the viewer whose 8th area is a front area.
- (B) is a figure which shows the setting of the separate minimum light emission luminance compensation value regarding the viewer whose 6th area is a front area.
- (C) is a figure which shows the setting of the separate minimum light emission luminance compensation value regarding the viewer whose 12th area is a front area.
- (D) is a diagram showing the setting of the minimum emission luminance compensation value obtained from the individual minimum emission luminance compensation values shown in (A) to (C).
- (A) is a figure which shows the position of the viewer with respect to the central axis of a display.
- B is a figure which shows the example of a display on a display. It is a figure for demonstrating halo at the time of viewing and listening from the diagonal of a display.
- (A) is a figure which shows the position of the viewer with respect to the central axis of a display.
- (B) is a figure which shows the example of a display on a display. It is a figure which shows the relationship between the viewing angle from the central axis of a display, and the light transmittance of a liquid crystal.
- the luminance of light emitted from the backlight is referred to as “light emission luminance”, and the luminance when light emitted from the backlight passes through the liquid crystal panel is referred to as “display luminance”. .
- Figure 1 is a block diagram showing a configuration of a liquid crystal display device 10 according to the first embodiment of the present invention.
- 1 includes a liquid crystal panel 11 as a display panel, a backlight 12, a panel drive circuit 13, a backlight drive circuit 14, a camera image acquisition unit 15 as a viewer information acquisition unit, and area active drive adjustment.
- the liquid crystal display device 10 divides the screen into a plurality of areas, and performs area active driving for driving the liquid crystal panel 11 while controlling the luminance of the backlight 12 based on an image to be displayed in the area.
- m and n are integers of 2 or more
- p and q are integers of 1 or more.
- the liquid crystal display device 10 receives input image data A1 including R image data, G image data, and B image data. Each of R image data, G image data, and B image data includes m ⁇ n pieces of data indicating display gradation.
- the area active drive processing unit 17 obtains liquid crystal data A2 used for driving the liquid crystal panel 11 and LED data A3 used for driving the backlight 12 based on the input image data A1 and first lowest emission luminance data B2 described later.
- the camera image acquisition unit 15 acquires camera data B1 including viewer information.
- the area active drive adjustment unit 16 obtains the minimum light emission luminance data B2, which is information relating to the luminance control of the backlight, based on the camera data B1. Details of the camera image acquisition unit 15, the area active drive adjustment unit 16, and the area active drive processing unit 17 will be described later. Hereinafter, the camera image acquisition unit 15, the area active drive adjustment unit 16, and the area active drive processing unit 17 may be collectively referred to as an “area active unit”.
- the liquid crystal panel 11 includes 3 m ⁇ n display elements 5.
- the display elements 5 are arranged in the column direction (vertical direction in FIG. 1 and corresponding to the Y direction described later) by 3 m each in the row direction (horizontal direction in FIG. 1 and corresponding to the X direction described later). Are arranged two-dimensionally as a whole.
- the display element 5 includes an R display element that transmits red light, a G display element that transmits green light, and a B display element that transmits blue light.
- the R display element, the G display element, and the B display element are arranged in the row direction, and one pixel is formed by the three display elements.
- the panel drive circuit 13 is a drive circuit for the liquid crystal panel 11.
- the panel drive circuit 13 outputs a signal (voltage signal) for controlling the light transmittance of the display element 5 to the liquid crystal panel 11 based on the liquid crystal data A2 output from the area active drive processing unit 17.
- the voltage output from the panel drive circuit 13 is written into the pixel capacitance in the display element 5, and the light transmittance of the display element 5 changes according to the voltage written in the pixel capacitance.
- the backlight 12 is provided on the back side of the liquid crystal panel 11 and irradiates the back surface of the liquid crystal panel 11 with backlight light.
- FIG. 2 is a diagram showing details of the backlight 12.
- the backlight 12 includes LED (Light Emitting Diode) units 6 as p ⁇ q light sources.
- the LED units 6 are two-dimensionally arranged as a whole, with p pieces in the row direction and q pieces in the column direction.
- the LED unit 6 includes a red LED 7r, a green LED 7g, and a blue LED 7b (hereinafter simply referred to as “LED” when they are not distinguished from each other and represented by reference numeral 7).
- the backlight 12 may include a white LED instead of the LED unit 6.
- the backlight 12 is described as being a direct type, but the present invention is not limited to this.
- an edge light type backlight may be used. That is, the illumination light may be guided to the liquid crystal panel 11 using an LED provided in the frame of the display and a plate-shaped light guide plate provided on the back surface of the liquid crystal panel 11. In this case, the light guide plate and the LED are arranged so that the thickness portion (side surface portion) of the light guide plate and the LED are in contact with each other.
- the backlight drive circuit 14 is a drive circuit for the backlight 12.
- the backlight drive circuit 14 outputs a signal (voltage signal or current signal) for controlling the luminance of the LED 7 to the backlight 12 based on the LED data A3 output from the area active drive processing unit 17.
- the brightness of the LED 7 is controlled independently of the brightness of the LEDs 7 included in the other LED units 6.
- the screen of the liquid crystal display device 10 is divided into p ⁇ q areas, and one LED unit 6 is associated with each area.
- the area active drive processing unit 17 obtains the luminance (light emission luminance) of the LED 7 included in the LED unit 6 corresponding to the area based on the input image data A1 corresponding to the area.
- the LED data A3 representing the calculated light emission luminance is output to the backlight drive circuit 14.
- one LED unit 6 is associated with each area, but a plurality of LED units 6 may be associated with each area.
- the area active drive processing unit 17 obtains the light emission luminance in all the display elements 5 included in the liquid crystal panel 11 based on the LED data A3. Further, the area active drive processing unit 17 obtains the light transmittance of all the display elements included in the liquid crystal panel 11 based on the input image data A1 and the light emission luminance, and performs panel drive on the liquid crystal data A2 representing the obtained light transmittance. Output to the circuit 13.
- the luminance of the R display element is the product of the luminance of the red light emitted from the backlight 12 and the light transmittance of the R display element.
- the light emitted from one red LED 7r hits a plurality of areas around the corresponding one area. Therefore, the display brightness of the R display element is the product of the sum of the light emission brightness of the plurality of red LEDs 7r and the light transmittance of the R display element.
- the display luminance of the G display element is the product of the total emission luminance of the plurality of green LEDs 7g and the light transmittance of the G display element
- the display luminance of the B display element is the sum of the emission luminances of the plurality of blue LEDs 7b. This is the product of the light transmittance of the B display element.
- the liquid crystal display device 10 obtains the liquid crystal data A2 and the LED data A3 based on the input image data A1, controls the light transmittance of the display element 5 based on the liquid crystal data A2, and the LED 7 based on the LED data A3. Controls the light emission brightness. Thereby, an image corresponding to the input image data A1 can be displayed on the liquid crystal panel 11.
- the luminance of the backlight 12 can be reduced by reducing the light emission luminance of the LED 7 corresponding to the area.
- the luminance of the display element 5 corresponding to the area is switched between a smaller number of levels, so that the resolution of the image can be increased and the quality of the display image can be improved.
- FIG. 3 is a block diagram illustrating details of the area active unit, that is, the camera image acquisition unit 15, the area active drive adjustment unit 16, and the area active drive processing unit 17 in the present embodiment.
- the camera image acquisition unit 15 includes a camera 151 and a camera image processing unit 152.
- the area active drive adjustment unit 16 includes a face detection unit 161 and a compensation value calculation unit 162.
- the area active drive processing unit 17 includes a light emission luminance calculation unit 171, a minimum light emission luminance compensation unit 172, a display luminance calculation unit 173, and a liquid crystal data calculation unit 174.
- the area active drive processing unit 17 stores luminance distribution data indicated by the luminance distribution when the light emitted from the LED 7 passes through the liquid crystal panel 11.
- the camera 151 acquires, as viewer information, more specifically, an image (hereinafter referred to as “camera image”) taken of the viewer as information regarding the position of the viewer and information regarding the number of people.
- the camera image is subjected to predetermined correction processing or the like by the camera image processing unit 152. Then, camera data B1 indicating the camera image after the correction processing is output to the face detection unit 161.
- the face detection unit 161 detects the viewer's face from the camera image indicated by the camera data B1.
- the face detection unit 161 also obtains the number of viewers based on the number of detected faces. Note that the number of viewers may be obtained by the compensation value calculation unit 162.
- the compensation value calculation unit 162 obtains the position of the viewer with respect to the liquid crystal display device 10 (more specifically, the liquid crystal panel 11) from the position of the face detected by the face detection unit 161. When there are a plurality of viewers, the position of each viewer is obtained. The position of the viewer in the present embodiment is obtained as an angle (hereinafter referred to as “viewing angle”) with respect to a normal line (hereinafter referred to as “center axis”) at the center of the liquid crystal panel 11. In addition, the number of viewers is obtained from the number of detected faces. The viewing angle calculation method will be described later. In addition, the compensation value calculation unit 162 obtains an individual minimum emission luminance compensation value for each viewer based on the viewing angle of each viewer.
- the individual minimum emission luminance compensation value is the minimum emission luminance of the LED 7 in the backlight 12 set according to the viewing angle of each viewer. Then, the compensation value calculation unit 162 calculates a minimum light emission luminance compensation value based on the individual minimum light emission luminance compensation value, and supplies the minimum light emission luminance data B2 including the calculated minimum light emission luminance compensation value to the minimum light emission luminance compensation unit 172. Output. A method for calculating the minimum emission luminance compensation value will be described later.
- the light emission luminance calculation unit 171 obtains the light emission luminance of all the LEDs 7 included in the backlight 12 based on the input image data A1. More specifically, the light emission luminance calculation unit 171 obtains a statistical value of the input image data A1 in each area for each of the p ⁇ q areas, and based on the obtained statistical value, the light emission luminance of the LED 7 corresponding to the area. Ask for. For example, the light emission luminance calculation unit 171 obtains the maximum value of the input image data A1 in the area, and obtains the light emission luminance of the LED 7 based on the obtained maximum value.
- the light emission luminance calculation unit 171 may obtain an average value of the input image data A1 in the area and obtain the light emission luminance of the LED 7 based on the obtained average value.
- the light emission luminance calculation unit 171 may obtain the maximum value and the average value of the input image data A1 in the area, and obtain the light emission luminance of the LED 7 based on these two values.
- the light emission luminance calculation unit 171 may align the light emission luminances of the three LEDs 7 included in one LED unit 6 to the same value, or may individually obtain the light emission luminances of the three LEDs 7.
- the minimum emission luminance compensation unit 172 performs the setting for raising the minimum emission luminance by correcting the emission luminance of the LED 7 obtained by the emission luminance calculation unit 171. More specifically, when the light emission luminance of the LED 7 obtained by the light emission luminance calculation unit 171 is lower than the minimum light emission luminance compensation value included in the minimum light emission luminance data B2, the lowest light emission luminance compensation unit 172 sets the light emission luminance to the lowest light emission. Correct the brightness compensation value.
- the minimum emission luminance compensation unit 172 outputs LED data A3 including the corrected emission luminance.
- the LED data A3 is output from the area active drive processing unit 17 to the backlight drive circuit 14 and used for driving the backlight 12.
- the LED data A3 is also used by the display luminance calculation unit 173.
- the display brightness calculation unit 173 obtains the brightness distribution of the backlight 12 based on the LED data A3 and the brightness distribution data. More specifically, the display luminance calculation unit 173 refers to the luminance distribution data and superimposes the individual emission luminances after correction obtained by the minimum emission luminance compensation unit 172, so that the backlight light causes the liquid crystal panel 11 to pass through. The display brightness when transmitting is obtained for all the display elements 5. The display brightness calculation unit 173 outputs display brightness data including display brightness in all the display elements 5.
- the liquid crystal data calculation unit 174 obtains the liquid crystal data A2 based on the input image data A1 and the display luminance data. More specifically, the liquid crystal data calculation unit 174 divides the 3m ⁇ n data included in the input image data A1 by the 3m ⁇ n display luminances included in the display luminance data, so that each display element 5 Obtain the light transmittance. The liquid crystal data calculation unit 174 converts the light transmittance of the display element 5 into the pixel gradation of the display element 5, and outputs liquid crystal data A2 including the pixel gradation of all the display elements 5. The liquid crystal data A2 is output from the area active drive processing unit 17 to the panel drive circuit 13 and used for driving the liquid crystal panel 11.
- FIG. 4 is a diagram for explaining the installation position of the camera 151 in the present embodiment.
- the constituent elements other than the camera 151 in the liquid crystal display device 10 are collectively referred to as a “display” and denoted by reference numeral 21.
- the camera 151 in the present embodiment is installed in the upper central portion of the display 21.
- the horizontal direction of the display 21 is the X direction
- the vertical direction is the Y direction
- the direction along the central axis 31 is the Z direction.
- the central axis 31 is a normal line at the center of the XY plane of the liquid crystal panel 11 constituting the display 21.
- the central axis 31 of the liquid crystal panel 11 may be described as the central axis of the display 21.
- the position of the face of the viewer 30 (hereinafter simply referred to as “the position of the viewer 30”) is obtained based on the camera image with the central axis 31 of the display 21 as a reference.
- a plurality of cameras 151 may be used, or may be installed at a position other than the center of the upper side of the display 21. When a plurality of cameras 151 are used, the position of the viewer 30 can be determined more accurately than when only one camera 151 is used.
- FIG. 5 is a diagram for explaining the position of the viewer 30 with respect to the central axis 31 (hereinafter simply referred to as position y) in the Y direction.
- the standard viewing distance from the display 21 to the viewer 30 is D
- the distance from the camera 151 to the intersection of the optical axis of the camera 151 and the central axis 31 is Ea, and the angle formed by the optical axis of the camera 151 and the central axis 31 is ⁇ .
- the viewer 30 is at a distance ya from the optical axis of the camera.
- the distance ya is obtained by scaling the number of pixels of the camera image corresponding to the distance ya to the length (m). For example, if a 1 m reference rod is photographed by the camera 151 and the number of pixels representing the length of the reference rod in the photographed image is ps, the scaling value S is set to 1 / ps. In this case, the distance ya, which is a pixel value, is obtained as a length (m) by setting S ⁇ ya.
- the distance Eb (> Ea) on the optical axis from the camera 151 to the viewer 30 may be obtained from distance information on the focus position in a face recognition autofocus camera, for example, or based on a standard face size Alternatively, it may be obtained approximately from the size of the face in the camera image.
- E Eb ⁇ cos ⁇ + ya ⁇ sin ⁇
- FIG. 6 is a diagram for explaining the position of the viewer 30 with respect to the central axis 31 (hereinafter simply referred to as position x) in the X direction.
- the position x is obtained by performing the above scaling from the camera image as shown in FIG.
- the calculation method of the position x and y shown above is only an example, and is not limited to the method demonstrated here.
- FIG. 7 is a diagram for explaining the calculation of the viewing angle ⁇ in the present embodiment.
- a distance r from the central axis 31 to the viewer 30 on the XY plane is given by the following equation (3).
- the viewing angle ⁇ is given by the following equation (4).
- This viewing angle ⁇ corresponds to a half angle of the apex angle of the cone, with the distance r being a radius and the height being a distance E.
- FIG. 8 is a flowchart showing the operation of the area active drive adjustment unit 16 in the present embodiment.
- Step S1 is a step corresponding to the face detection unit 161
- steps S2 to S7 are steps corresponding to the compensation value calculation unit 162. Note that steps S1 to S7 are performed in synchronization with the frame of the input image, for example.
- step S1 the face of the viewer 30 is detected from the camera image.
- the face detection algorithm various known techniques such as a combination of pattern matching using the Haar-like pattern and learning using the Ada-boost method can be used. If there are a plurality of viewers 30, the faces for the plurality of people are detected in step S ⁇ b> 1.
- the number of viewers 30 is represented by Na.
- step S2 After the counter i is set to 1 in step S2, the position of the i-th viewer 30 is obtained in step S3 based on the detected face detection result of the i-th viewer 30. More specifically, the viewing angle ⁇ of the i-th viewer 30 is obtained from Equation (4).
- step S4 based on the viewing angle ⁇ of the i-th viewer 30, an individual minimum emission luminance compensation value for the i-th viewer 30 is obtained.
- the individual minimum emission luminance compensation value and the minimum emission luminance compensation value used by the minimum emission luminance compensation unit 172 are set uniformly in all areas.
- the individual minimum emission luminance compensation value is set so that the value increases as the viewing angle ⁇ increases, as shown in FIG. 9, for example.
- An expression representing the relationship between the viewing angle ⁇ and the minimum light emission luminance (hereinafter referred to as “relationship expression of FIG. 9”) shown in FIG. 9 is stored in advance in, for example, the area active drive adjustment unit 16.
- the minimum emission luminance is increased as the viewing angle is around several tens of degrees. Since it is not necessary, for example, in the relational expression of FIG. 9, the individual minimum emission luminance compensation value may be set to be smaller from the viewing angle near several tens of degrees as the angle increases.
- step S 7 the maximum individual minimum emission luminance compensation value among the obtained individual minimum emission luminance compensation values is set as the minimum emission luminance compensation value used in the minimum emission luminance compensation unit 172.
- step S1 If no face is detected in step S1, that is, if no viewer 30 exists, the minimum luminance compensation value is maintained at a predetermined value or the viewer 30 exists instead of steps S2 to S7.
- Various processes can be performed such as maintaining the minimum luminance compensation value in the latest frame.
- FIG. 10 is a diagram for explaining the setting of the individual minimum emission luminance compensation value for the viewer 30 whose viewing angle ⁇ is relatively small.
- FIG. 10A is a diagram showing a display example on the liquid crystal panel 11.
- FIG. 10B is a diagram schematically showing an individual minimum emission luminance compensation value of each area corresponding to the line AA in FIG.
- FIG. 11 is a diagram for describing setting of the individual minimum emission luminance compensation value for the viewer 30 having a relatively large viewing angle ⁇ .
- FIG. 11A is a diagram showing a display example on the liquid crystal panel 11.
- FIG. 11B is a diagram schematically showing an individual minimum emission luminance compensation value of each area corresponding to the line AA in FIG. FIG. 10A and FIG.
- FIGS. 10A, 10B, 11A, and 11B particularly show display examples viewed by the viewer 30 when viewing from an oblique direction.
- the number of areas in the X direction is 15, and the area numbers 1 to 15 are assigned to the upper part of FIGS. 10A and 11A and the lower part of FIGS. 10B and 11B.
- first to fifteenth areas from the left side of FIGS. 10A, 10B, 11A, and 11B are referred to as “first to fifteenth areas”, respectively.
- k-th area to a k-th or k-th area.
- the individual minimum emission luminance compensation value for the viewer 30 with a relatively small viewing angle ⁇ is set to be relatively small. That is, the luminance difference between the high luminance region and the low luminance region is relatively large. However, this luminance difference is smaller than or equal to the case where the minimum emission luminance increase setting is not performed. Thus, even when the luminance difference between the high luminance region and the low luminance region is relatively large, the halo is difficult to be recognized by the viewer 30 whose viewing angle ⁇ is relatively small. The reason for this is as described above. In this case, since the luminance difference between the high luminance region and the low luminance region becomes relatively large, a sufficient contrast can be obtained. However, on the other hand, a viewer 30 with a relatively large viewing angle ⁇ , that is, a viewer 30 viewing from an oblique angle, can easily recognize halo as shown in FIG. This reason is also as described above.
- the individual minimum emission luminance compensation value for the viewer 30 having a relatively large viewing angle ⁇ is set to be relatively large. That is, the luminance difference between the high luminance region and the low luminance region is relatively small.
- the halo is difficult to be recognized even by the viewer 30 having a relatively large viewing angle ⁇ , that is, the viewer 30 viewing from an oblique direction.
- the viewer 30 with a relatively small viewing angle ⁇ that is, the viewer 30 viewing from near the front, is not likely to recognize halo.
- the minimum emission luminance of the backlight 12 is set higher than necessary. For this reason, considering the case where only the viewer 30 with a relatively small viewing angle ⁇ views, the contrast is unnecessarily lowered. In addition, the driving power of the backlight is unnecessarily increased.
- the minimum emission luminance is set sufficiently high in advance.
- This setting is, for example, a setting as shown in FIG. 11B and is fixed regardless of the position and number of viewers.
- the minimum light emission brightness is set higher than necessary, unnecessary contrast reduction is caused.
- the driving power of the backlight is unnecessarily increased.
- control in consideration of the case where there are a plurality of viewers is not performed.
- the individual minimum emission luminance compensation value that increases as the viewing angle ⁇ of the viewer 30 increases is set as the minimum emission luminance compensation value.
- the minimum emission luminance compensation value is appropriately set in accordance with the viewing angle ⁇ of the viewer 30. Then, by setting the minimum light emission luminance to be increased using the minimum light emission luminance compensation value, it is possible to suppress halo while suppressing a decrease in contrast.
- the maximum individual minimum emission luminance compensation value among the plurality of types of individual minimum emission luminance compensation values corresponding to the positions of the plurality of viewers 30 is the minimum emission luminance. Set as compensation value.
- the minimum light emission luminance compensation value is set in consideration of the halo that can be recognized by the viewer 30 with the largest viewing angle ⁇ . And halo can be suppressed by performing the minimum light emission brightness raising setting using this minimum light emission brightness compensation value.
- the minimum emission luminance compensation value is not larger than the individual minimum emission luminance compensation value for the viewer 30 having the largest viewing angle ⁇ , the contrast is reduced even when there are a plurality of viewers 30. Can be suppressed.
- the minimum light emission luminance is appropriately set as described above, so that the driving power of the backlight 12 can be increased. Can be suppressed.
- the minimum emission luminance compensation value and the individual minimum emission luminance compensation value for each viewer are set uniformly in all areas. For this reason, the above-mentioned effect can be acquired by simple setting.
- the liquid crystal data calculation unit 174 obtains the liquid crystal data A2 based not only on the input image data A1 but also on the display luminance data. For this reason, the liquid crystal data A2 is obtained in consideration of the light emission luminance of each area. Thereby, the light transmittance of each display element 5 is calculated
- step S7 described above the maximum individual minimum emission luminance compensation value among the obtained individual minimum emission luminance compensation values is set as the minimum emission luminance compensation value used in the minimum emission luminance compensation unit 172.
- the present invention is not limited to this.
- an average value of the obtained individual minimum emission luminance compensation values may be set as the minimum emission luminance compensation value. According to this modification, the effect of suppressing halo is inferior to that of the first embodiment, but it is possible to further suppress a decrease in contrast and an increase in driving power of the backlight 12.
- Second Embodiment> In recent years, the size of liquid crystal display devices has been increasing. For example, in a liquid crystal display device having a panel size of 60 type or the like, even when the viewer 30 is viewing from the center of the display 21, when the edge of the display 21 (more specifically, the liquid crystal panel 11) is viewed, Depending on the viewing angle characteristics, halo can occur. Note that when the viewer 30 is viewing from the end of the display 21, the same problem may occur even when viewing the center or the opposite edge of the display 21. Second embodiment of the present invention is to suppress the halo in the liquid crystal display device having such a large. Since the present embodiment is basically the same in configuration and operation as the first embodiment except for the operation of the area active drive adjustment unit 16, the description of the common parts is omitted.
- FIG. 12 is a flowchart showing the operation of the area active drive adjustment unit 16 in the present embodiment.
- steps S8 to S11 are added instead of step S7 in the first embodiment.
- Steps S8 to S11 are steps corresponding to the compensation value calculation unit 162 as in step S7 in the first embodiment.
- steps S1 to S6 and S8 to S11 are performed in synchronization with the frame of the input image, for example.
- steps S 1 to S 6 and S 8 to S 11 steps S 1, S 2, S 5, and S 6 are the same as those in the first embodiment, and a description thereof is omitted.
- step S3 the position of the i-th viewer 30 is obtained based on the detected face detection result of the i-th viewer 30.
- positions x and y are obtained as the position of the viewer 30 instead of the viewing angle ⁇ .
- the calculation method of the positions x and y is as described above. In this way, by using the positions x and y, it is possible to know which area the viewer 30 is viewing from.
- the area located in front of the viewer 30 is referred to as “the front area of the viewer 30”.
- the viewer 30 views from the front of the area closest to the viewer 30.
- Step S4 described later is applied. Note that the value used to represent the position of the viewer 30 is not limited to the example shown here, and various values can be adopted.
- step S4 based on the positions x and y of the i-th viewer 30, an individual minimum emission luminance compensation value for the i-th viewer 30 is obtained.
- the individual minimum emission luminance compensation value and the minimum emission luminance compensation value used by the minimum emission luminance compensation unit 172 are set for each area.
- the individual minimum emission brightness compensation value of each area is set such that the farther the area is from the front area of the i-th viewer 30, the more the individual minimum emission brightness compensation value of the area is. Is set to be large.
- An expression representing the relationship between the distance from the front area and the individual minimum emission luminance compensation value shown in FIG. 13 hereinafter referred to as “relationship expression of FIG.
- the relational expression in FIG. 13 is held in advance in, for example, the area active drive adjustment unit 16. .
- the relational expression in FIG. 13 is non-linear, it may be linear and can be variously changed according to other purposes.
- the relational expression in FIG. 13 is applied in consideration of both the X direction and the Y direction. That is, the “distance from the front area” shown in FIG. 13 is a distance on the XY plane. Such a setting is for suppressing halo in the large liquid crystal display device as described above. Thereby, the halo in the area away from the front area is suppressed.
- step S4 Na times individual minimum emission luminance compensation values for all viewers 30 are obtained.
- the individual minimum emission luminance compensation value is described as being set for each area, but may be set for a plurality of areas smaller than the total number of areas.
- step S9 the maximum individual minimum emission luminance compensation value among the individual minimum emission luminance compensation values of the jth area for all viewers is set to the minimum emission luminance compensation unit 172. Is set as the minimum emission luminance compensation value of the jth area used in the above. Details of this setting will be described later.
- FIG. 14 is a diagram for explaining the setting of the minimum light emission luminance compensation value in the present embodiment. More specifically, FIG. 14A shows the setting of the individual minimum emission luminance compensation value for the viewer 30 (hereinafter referred to as “first viewer” in the present embodiment) whose eighth area is the front area.
- FIG. 14B is a diagram showing the setting of the individual minimum emission luminance compensation value for the viewer 30 whose sixth area is the front area (hereinafter referred to as “second viewer” in the present embodiment).
- FIG. 14C is a diagram showing the setting of the individual minimum emission luminance compensation value for the viewer 30 (hereinafter referred to as “third viewer” in the present embodiment) whose 12th area is the front area.
- FIG. 14A shows the setting of the individual minimum emission luminance compensation value for the viewer 30 (hereinafter referred to as “first viewer” in the present embodiment) whose eighth area is the front area.
- FIG. 14B is a diagram showing the setting of the individual minimum emission luminance compensation value for the viewer 30 whose
- 14D is a diagram showing the setting of the minimum light emission luminance compensation value obtained from the individual minimum light emission luminance compensation values shown in FIGS. 14A to 14C.
- the number of areas in the X direction is assumed to be 15 as in the description of the individual minimum emission luminance compensation value in the first embodiment. Further, it is assumed that the number of viewers 30 is three.
- 14A to 14D schematically show the individual minimum emission luminance compensation value and the minimum emission luminance compensation value for convenience of explanation, and the individual minimum emission luminance compensation value of each area as the distance from the front area increases. Changes so as to increase linearly.
- the individual minimum emission luminance compensation value in the front area is assumed to be 0, but the present invention is not limited to this.
- the individual minimum emission luminance compensation value of each area relating to the first viewer 30 increases as the area moves away from the eighth area. That is, the individual minimum emission luminance compensation value of the eighth area is 0, and the individual minimum emission luminance compensation values of the ninth, tenth, eleventh, twelfth, thirteenth, fourteenth and fifteenth areas are 1, 2, respectively. 3, 4, 5, 6, and 7, and the individual minimum emission luminance compensation values of the seventh, sixth, fifth, fourth, third, second, and first areas are 1, 2, 3, 4, and 5, respectively. , 6 and 7.
- the individual minimum emission luminance compensation value of each area relating to the second viewer 30 increases as the area moves away from the sixth area. That is, the individual minimum emission luminance compensation value for the sixth area is 0, and the individual minimum emission luminance compensation value for the seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, and fifteenth areas. Are 1, 2, 3, 4, 5, 6, 7, 8, 9 respectively, and the individual minimum emission luminance compensation values of the fifth, fourth, third, second, and first areas are 1, 2, 3, respectively. , 4 and 5.
- the individual minimum emission luminance compensation value of each area relating to the third viewer 30 increases as the area moves away from the twelfth area. That is, the individual minimum emission luminance compensation value of the twelfth area is 0, and the individual minimum emission luminance compensation values of the thirteenth, fourteenth, and fifteenth areas are 1, 2, and 3, respectively, and the eleventh, tenth, ninth,
- the individual minimum emission luminance compensation values of the eighth, seventh, sixth, fifth, fourth, third, second, and first areas are 1, 2, 3, 4, 5, 6, 7, 8, and 9, respectively. , 10,11.
- the maximum individual minimum emission luminance compensation value among the individual minimum emission luminance compensation values of each area relating to the first to third viewers 30 is the lowest of the area used by the minimum emission luminance compensation unit 172. It is set as a light emission luminance compensation value.
- the maximum value among the individual minimum emission luminance compensation values for the first to third viewers 30 is 4 of the individual minimum emission luminance compensation value for the third viewer 30.
- the minimum emission luminance compensation value in the eighth area is 4.
- the maximum value of the individual minimum emission luminance compensation values for the first to third viewers 30 is 3 of the individual minimum emission luminance compensation value for the second or third viewer 30. Therefore, the minimum emission luminance compensation value in the ninth area is 3.
- the maximum value of the individual minimum emission luminance compensation values for the first to third viewers 30 is 4 of the individual minimum emission luminance compensation value for the second viewer 30.
- the minimum emission luminance compensation value for the tenth area is 4.
- the minimum emission luminance compensation values are set for the other areas, so that the minimum emission luminance compensation values for the first to fifteenth areas are 11, 10, 9, 8, 7, 7, 6, 5, 4, 3 respectively. , 4, 5, 6, 7, 8, and 9.
- any one of the individual minimum emission luminance compensation values shown in FIGS. 14A to 14C is the lowest. It becomes a light emission luminance compensation value.
- the individual minimum emission luminance compensation value that increases as the distance from the viewer's front area increases is set as the minimum emission luminance compensation value.
- the minimum light emission luminance compensation value is appropriately set in consideration of the front area corresponding to the position (position x, y) of the viewer 30. Then, by setting the minimum light emission luminance to be increased using this minimum light emission luminance compensation value, it is possible to suppress halo even when viewing an area away from the front area in a liquid crystal display device having a large panel size.
- the minimum light emission luminance compensation value is not set to be high in advance, it is possible to suppress a decrease in contrast as in the first embodiment.
- the maximum individual minimum emission luminance compensation value among the plurality of types of individual minimum emission luminance compensation values corresponding to the positions of the plurality of viewers 30 is the lowest in each area. It is set as a light emission luminance compensation value. Therefore, the minimum light emission luminance compensation value is set in consideration of the position of each viewer. Then, by setting the minimum emission luminance to be increased using the minimum emission luminance compensation value, even when a plurality of viewers 30 see an area away from the front area in a liquid crystal display device having a large panel size, Halo can be suppressed.
- the minimum emission luminance compensation value is not larger than the maximum value of the individual minimum emission luminance compensation values for each viewer 30, even when there are a plurality of viewers 30, a decrease in contrast is suppressed. be able to. Note that, in both cases where there is only one viewer 30 and there are a plurality of viewers 30, the minimum light emission luminance is appropriately set as described above, so that the driving power of the backlight 12 can be increased. Can be suppressed.
- step S8 the maximum individual minimum emission luminance compensation value among the individual minimum emission luminance compensation values of each area relating to the plurality of viewers 30 is used as the minimum emission luminance of the area used by the minimum emission luminance compensation unit 172.
- the compensation value is set, the present invention is not limited to this.
- an average value of the individual minimum emission luminance compensation values of each area related to a plurality of viewers 30 may be set as the minimum emission luminance compensation value of the area. According to this modification, the effect of suppressing halo is inferior to that of the second embodiment, but it is possible to further suppress a decrease in contrast and an increase in driving power of the backlight 12.
- FIG. 15 is a block diagram showing the configuration of the liquid crystal display device 10 according to the third embodiment of the present invention.
- the liquid crystal display device 10 according to the present embodiment is obtained by adding an illumination unit 18 as a component of the liquid crystal display device 10 according to the first embodiment.
- the illumination unit 18 includes an illumination 181 and an illumination brightness adjustment unit 182 as shown in FIG.
- the illumination 181 illuminates the viewer 30.
- the illumination brightness adjustment unit 182 adjusts the brightness of the illumination 181 (hereinafter referred to as “illumination brightness”) according to the environmental brightness.
- the illumination 181 is installed on the upper side of the display 21, for example, as shown in FIG.
- the number of lighting 181 and an installation position are not limited to this. Further, it is assumed that the illumination brightness adjusting unit 182 is included in the display 21.
- FIG. 18 is a flowchart showing the operation of the illumination brightness adjustment unit 182 in the present embodiment. Steps S21 to S24 are performed in synchronization with the frame of the input image, for example.
- step S21 based on the camera image included in the camera data B1 generated by the camera image processing unit 152, the current environmental brightness that is the environmental brightness when the camera image is taken is obtained.
- the environmental brightness may be acquired by separately providing a sensor for measuring the environmental brightness.
- step S22 it is determined whether or not the current environmental brightness obtained in step S21 is sufficient for the face detection of the viewer 30. This determination is made based on, for example, a predetermined threshold value representing the environmental brightness required for detecting the face of the viewer 30 (hereinafter referred to as “environmental brightness threshold value”). If it is higher, the environmental brightness is sufficient for the face detection of the viewer 30, and if it is below the environmental brightness threshold, it is determined that the environmental brightness is insufficient for the face detection of the viewer 30. Note that the environmental brightness threshold value may be changed as necessary. If the current environmental brightness is insufficient for the face detection of the viewer 30, the process proceeds to S23, and if it is sufficient, the operation of the illumination brightness adjustment unit 182 ends.
- a predetermined threshold value representing the environmental brightness required for detecting the face of the viewer 30
- step S23 based on the current environmental brightness and the environmental brightness threshold, the illumination brightness for obtaining the environmental brightness capable of detecting the face is obtained.
- This illumination luminance is calculated based on, for example, an expression representing the relationship between the current environmental luminance (lx) and the illumination luminance (lm) as shown in FIG.
- the relational expression in FIG. 19 is held in advance in the illumination luminance adjusting unit 182.
- luminance shown in FIG. 19 changes with the magnitude
- step S24 the illumination brightness obtained in step S23 is adjusted to be the illumination brightness of the illumination 181. As described above, when the environmental brightness is insufficient, the illumination brightness of the illumination 181 is adjusted to be high.
- the illumination brightness of the illumination 181 is adjusted to be high. For this reason, it is possible to suppress a decrease in face detection accuracy. Moreover, since environmental brightness is acquired from the camera image, it is not necessary to provide a separate sensor or the like.
- steps S3 and S4 are performed only when the current environmental brightness is insufficient for the face detection of the viewer 30, but the present invention is not limited to this.
- the illumination luminance corresponding to the current environmental luminance is obtained in step S3, and the obtained illumination luminance is set as the illumination luminance of the illumination 181. Also good. Accordingly, for example, when the current environmental brightness is sufficiently higher than the environmental brightness threshold and the illumination brightness is higher than necessary, the illumination brightness of the illumination 181 is appropriately increased based on the relational expression of FIG. By setting the length, the power consumption of the illumination 181 can be reduced.
- the camera image acquisition unit 15 is used as the viewer information acquisition unit.
- the present invention is not limited to this, and various other viewer information (particularly the viewer information).
- a device for obtaining information on position and / or number of people) can be employed.
- an ultrasonic sensor or an infrared sensor hereinafter collectively referred to simply as “sensor”.
- a plurality of sensors directed in different directions with respect to an assumed viewer position within the standard viewing range can be arranged side by side on a display frame or the like.
- Such a sensor pairs a transmitter and a receiver, and usually detects only an object on the optical axis to which the sensor is directed. Therefore, by using a plurality of sensors directed in different directions, a plurality of viewers can be used. The number of viewers and / or viewer positions when present can be detected.
- color display is performed using RGB three primary colors.
- the present invention is not limited to this.
- four primary colors such as RGBY (Y is yellow), or other multi-primary colors.
- Display may be performed.
- monochrome display may be performed.
- the liquid crystal data calculation unit 174 calculates the liquid crystal data A2 based on the input image data A1 and the display luminance data.
- the present invention is not limited to this, and the input image is not limited thereto.
- the liquid crystal data A2 may be obtained based only on the data A1.
- the third embodiment may be combined with the second embodiment.
- the above-described embodiments can be variously modified and implemented without departing from the spirit of the present invention.
- the present invention can be applied to a display device having a function of controlling the luminance of the backlight and a display method in the display device.
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Abstract
Description
複数の表示素子を含む表示パネルと、
複数の光源を含むバックライトと、
前記視聴者の位置に関する情報を少なくとも含む視聴者情報を取得する視聴者情報取得部と、
前記視聴者情報に基づいて前記バックライトの輝度制御に関する情報を求める駆動調整部と、
入力画像を複数のエリアに分割し、各エリアに対応した入力画像および前記バックライトの輝度制御に関する情報に基づき、各エリアに対応した光源の発光輝度を求める駆動処理部と、
前記駆動処理部により求められた発光輝度に基づき、前記バックライトに対して前記光源の輝度を制御する信号を出力するバックライト駆動部と、
少なくとも前記入力画像に関する情報から求められる前記表示パネルの光透過制御に関する情報に基づき、前記表示パネルに対して前記表示素子の光透過率を制御する信号を出力するパネル駆動部とを備えることを特徴とする。
前記バックライトの輝度制御に関する情報は、前記バックライトの最低発光輝度を示す最低発光輝度補償値を含み、
前記駆動処理部は、前記駆動調整部から受信した最低発光輝度補償値に基づき、前記バックライトの発光輝度を補正することを特徴とする。
前記駆動調整部は、前記最低発光輝度補償値を、前記視聴者の位置に関する情報から得られる当該視聴者の位置に基づいて求めることを特徴とする。
前記視聴者情報は、前記視聴者の人数に関する情報をさらに含み、
前記駆動調整部は、
前記視聴者の人数が一人である場合には、当該視聴者に関して当該視聴者の位置に応じて決定される、前記バックライトの最低発光輝度を示す個別最低発光輝度補償値を前記最低発光輝度補償値として求め、
前記視聴者の人数が複数人である場合には、各視聴者に関する個別最低発光輝度補償値に基づいて前記最低発光輝度補償値を求めることを特徴とする。
前記個別最低発光輝度補償値および前記最低発光輝度補償値のそれぞれは、全エリアで一律に設定され、
前記視聴者に関する個別最低発光輝度補償値は、前記表示パネルの中心に対する当該視聴者の位置に応じて設定されることを特徴とする。
前記視聴者数が複数人である場合の前記最低発光輝度補償値は、複数人の視聴者に関する個別最低発光輝度補償値のうちの最大の個別最低発光輝度補償値であることを特徴とする。
前記視聴者に関する個別最低発光輝度補償値は、前記表示パネルの中心における法線に対する当該視聴者の位置の角度が大きいほど大きくなるように設定されることを特徴とする。
前記個別最低発光輝度補償値および前記最低発光輝度補償値のそれぞれは、所定数のエリア毎に設定され、
前記視聴者に関する前記所定数のエリア毎の個別最低発光輝度補償値は、当該所定数のエリアが当該視聴者の正面のエリアから離れているほど大きくなるように設定されることを特徴とする。
前記視聴者の人数が複数人である場合の、前記所定数のエリア毎の最低発光輝度補償値は、複数人の視聴者に関する当該所定数のエリア毎の個別最低発光輝度補償値のうちの最大の個別最低発光輝度補償値であることを特徴とする。
前記視聴者情報取得部は、視聴者を撮影した画像を、前記視聴者情報として取得するカメラを含むことを特徴とする。
前記駆動調整部は、前記視聴者を撮影した画像から当該視聴者の顔を検出して前記表示パネルに対する当該顔の位置を取得することにより、少なくとも当該視聴者の位置を求めることを特徴とする。
前記視聴者を照らす照明と、
視聴環境の明るさに応じて前記照明の輝度を調整する照明輝度調整部とをさらに備えることを特徴とする。
前記照明輝度調整部は、前記視聴者を撮影した画像から前記視聴環境の明るさを取得することを特徴する。
前記駆動処理部はさらに、各エリアに対応した入力画像に関する情報および各エリアに対応した光源の発光輝度に基づいて、前記表示パネルの光透過制御に関する情報を求めることを特徴とする。
前記視聴者の位置に関する情報を少なくとも含む視聴者情報を取得する視聴者情報取得ステップと、
前記視聴者情報に基づいて前記バックライトの輝度制御に関する情報を求めるステップと、
入力画像を複数のエリアに分割し、各エリアに対応した入力画像および前記バックライトの輝度制御に関する情報に基づき、各エリアに対応した光源の発光輝度を求める駆動調整ステップと、
前記駆動処理ステップで求められた発光輝度に基づき、前記バックライトに対して前記光源の輝度を制御する信号を出力するバックライト駆動ステップと、
少なくとも前記入力画像に関する情報から求められる前記表示パネルの光透過制御に関する情報に基づき、前記表示パネルに対して前記表示素子の光透過率を制御する信号を出力するパネル駆動ステップとを備えることを特徴とする。
前記バックライトの輝度制御に関する情報は、前記バックライトの最低発光輝度を示す最低発光輝度補償値を含み、
前記駆動処理ステップでは、前記駆動調整ステップで求められた最低発光輝度補償値に基づき、前記バックライトの発光輝度が補正されることを特徴とする。
前記駆動調整ステップでは、前記最低発光輝度補償値は、前記視聴者の位置に関する情報から得られる当該視聴者の位置に基づいて求められることを特徴とする。
前記視聴者情報は、前記視聴者の人数に関する情報をさらに含み、
前記駆動調整ステップでは、
前記視聴者の人数が一人である場合には、当該視聴者に関して当該視聴者の位置に応じて決定される、前記バックライトの最低発光輝度を示す個別最低発光輝度補償値が前記最低発光輝度補償値として求められ、
前記視聴者の人数が複数人である場合には、各視聴者に関する個別最低発光輝度補償値に基づいて前記最低発光輝度補償値が求められることを特徴とする。
<1.1 全体構成および動作概要>
図1は、本発明の第1の実施形態に係る液晶表示装置10の構成を示すブロック図である。図1に示す液晶表示装置10は、表示パネルとしての液晶パネル11、バックライト12、パネル駆動回路13、バックライト駆動回路14、視聴者情報取得部としてのカメラ画像取得部15、エリアアクティブ駆動調整部16、およびエリアアクティブ駆動処理部17を備えている。液晶表示装置10は、画面を複数のエリアに分割し、エリア内に表示すべき画像に基づきバックライト12の輝度を制御しながら、液晶パネル11を駆動するエリアアクティブ駆動を行う。以下では、mおよびnは2以上の整数、pおよびqは1以上の整数であるとする。
図3は、本実施形態におけるエリアアクティブユニット、すなわちカメラ画像取得部15、エリアアクティブ駆動調整部16、およびエリアアクティブ駆動処理部17の詳細を示すブロック図である。カメラ画像取得部15は、カメラ151およびカメラ画像処理部152を含んでいる。エリアアクティブ駆動調整部16は、顔検出部161および補償値算出部162を含んでいる。エリアアクティブ駆動処理部17は、発光輝度算出部171、最低発光輝度補償部172、表示輝度算出部173、および液晶データ算出部174を含んでいる。また、エリアアクティブ駆動処理部17は、LED7から出射された光が液晶パネル11を透過するときの輝度分布が示す輝度分布データを記憶している。
図4は、本実施形態におけるカメラ151の設置位置について説明するための図である。なお、以下では、液晶表示装置10のうちのカメラ151以外の構成要素をまとめて「ディスプレイ」といい、符号21で表す。本実施形態におけるカメラ151は、図4に示すように、ディスプレイ21の上辺中央部に設置されている。図4に示すように、ディスプレイ21の水平方向をX方向とし、垂直方向をY方向とし、中心軸31に沿った方向をZ方向とする。ここで、中心軸31は、具体的には、ディスプレイ21を構成する液晶パネル11のXY平面の中心における法線である。以下では、液晶パネル11の中心軸31をディスプレイ21の中心軸として説明することがある。本実施形態では、視聴者30の顔の位置(以下単に「視聴者30の位置」という。)は、ディスプレイ21の中心軸31を基準として、カメラ画像に基づいて求められる。なお、カメラ151は複数台用いても良く、また、ディスプレイ21の上辺中央部以外の位置に設置しても良い。カメラ151を複数台用いた場合、1台のみ用いる場合よりも正確に視聴者30の位置を求めることができる。
y = ya・cosθ - (Eb-Ea)sinθ …(1)
E = Eb・cosθ + ya・sinθ …(2)
図8は、本実施形態におけるエリアアクティブ駆動調整部16の動作を示すフローチャートである。ステップS1は顔検出部161に対応するステップであり、ステップS2~S7は補償値算出部162に対応するステップである。なお、ステップS1~S7は例えば入力画像のフレームに同期して行われる。
図10は、視聴角度εが比較的小さい視聴者30に関する個別最低発光輝度補償値の設定について説明するための図である。図10(A)は、液晶パネル11における表示例を示す図である。図10(B)は、図10(A)におけるA-A線に対応した各エリアの個別最低発光輝度補償値を模式的に示す図である。図11は、視聴角度εが比較的大きい視聴者30に関する個別最低発光輝度補償値の設定について説明するための図である。図11(A)は、液晶パネル11における表示例を示す図である。図11(B)は、図11(A)におけるA-A線に対応した各エリアの個別最低発光輝度補償値を模式的に示す図である。図10(A)および図11(A)は特に、斜めから視聴した場合に視聴者30が視認する表示例を示したものである。ここでは、X方向のエリア数を15とし、図10(A)および図11(A)の上部および図10(B)および図11(B)の下部にはエリアの番号1~15を付している。以下では、図10(A)、図10(B)、図11(A)および図11(B)の左側から1番目~15番目のエリアのことをそれぞれ「第1~第15エリア」という。なお、本説明以外においても、k個目あるいはk番目のエリアのことを「第kエリア」ということがある。また、以下の個別最低発光輝度補償値または最低発光輝度補償値の設定に関する図を参照しながらの説明では、X方向に関する個別最低発光輝度補償値または最低発光輝度補償値に着目するが、実際にはY方向あるいはXY平面において同様の説明が成り立つことに留意されたい。また、以下では、図10(A)および後述の図11(A)に示すように、低輝度領域からなる背景の中央に小窓状の高輝度領域ある画像を例に挙げて説明するが、本例以外の、画像中に極端に大きな輝度差がある例についても同様の説明が成り立つことに留意されたい。なお、本明細書で説明する低輝度領域の輝度は、例えば最低発光輝度と同じ輝度であるとする。
ところが、本実施形態では、視聴者30が一人である場合には、その視聴者30の視聴角度εが大きくなるにつれて大きくなる個別最低発光輝度補償値が最低発光輝度補償値として設定される。このため、最低発光輝度補償値は、視聴者30の視聴角度εに応じて適切に設定される。そして、この最低発光輝度補償値を用いて最低発光輝度持ち上げ設定が行われることにより、コントラストの低下を抑制しつつ、ハロを抑制することができる。また、視聴者30が複数人である場合には、複数人の視聴者30の位置にそれぞれ応じた複数種類の個別最低発光輝度補償値のうちの最大の個別最低発光輝度補償値が最低発光輝度補償値として設定される。このため、視聴角度εが最も大きい視聴者30により認識され得るハロを重点的に考慮して、最低発光輝度補償値が設定される。そして、この最低発光輝度補償値を用いて最低発光輝度持ち上げ設定が行われることにより、ハロを抑制することができる。ここで、最低発光輝度補償値は、視聴角度εが最も大きい視聴者30に関する個別最低発光輝度補償値よりも大きな値にはならないので、視聴者30が複数人である場合でも、コントラストの低下を抑制することができる。なお、視聴者30が一人である場合および視聴者30が複数人である場合のいずれにおいても、上述のように最低発光輝度が適切に設定されるので、バックライト12の駆動電力の増大をも抑制することができる。
上記ステップS7では、得られた個別最低発光輝度補償値のうちの、最大の個別最低発光輝度補償値を、最低発光輝度補償部172で使用される最低発光輝度補償値として設定するものとしたが、本発明はこれに限定されるものではない。例えば、上記第1の実施形態の変形例として、得られた個別最低発光輝度補償値の平均値を最低発光輝度補償値として設定しても良い。本変形例によれば、上記第1の実施形態よりもハロの抑制効果は劣ることになるが、コントラストの低下およびバックライト12の駆動電力の増大をさらに抑制することができる。
近年、液晶表示装置の大型化が進んでいる。例えばパネルサイズが60型などの液晶表示装置では、視聴者30がディスプレイ21の中央から視聴している場合でも、そのディスプレイ21(より詳細には液晶パネル11)の縁を見ると、上述の液晶の視野角特性によりハロが生じ得る。なお、視聴者30がディスプレイ21の端から視聴している場合に、そのディスプレイ21の中央または反対側の縁などを見る場合などでも同様の問題が生じ得る。本発明の第2の実施形態は、このような大型の液晶表示装置においてハロを抑制するものである。なお、本実施形態は、エリアアクティブ駆動調整部16の動作を除き上記第1の実施形態と構成および動作が基本的に共通するので、このように共通する部分については説明を省略する。
図12は、本実施形態におけるエリアアクティブ駆動調整部16の動作を示すフローチャートである。図12に示すように、上記第1の実施形態におけるステップS7に代えて、ステップS8~S11が加わっている。ステップS8~S11は、上記第1の実施形態におけるステップS7と同様に補償値算出部162に対応するステップである。上記第1の実施形態と同様に、ステップS1~S6,S8~S11は例えば入力画像のフレームに同期して行われる。なお、ステップS1~S6,S8~S11のうち、ステップS1,S2,S5,S6では上記第1の実施形態と同様の処理が行われるのでその説明を省略する。
本実施形態によれば、視聴者30が一人である場合には、その視聴者の正面エリアから離れるにつれて大きくなる個別最低発光輝度補償値が最低発光輝度補償値として設定される。このため、最低発光輝度補償値は、視聴者30の位置(位置x,y)に応じた正面エリアを考慮して適切に設定される。そして、この最低発光輝度補償値を用いて最低発光輝度持ち上げ設定が行われることにより、パネルサイズが大きい液晶表示装置において正面エリアから離れたエリアなどを見る場合でも、ハロを抑制することができる。また、最低発光輝度補償値を予め高く設定するなどは行われないので、上記第1の実施形態と同様にコントラストの低下を抑制することができる。視聴者30が複数人である場合には、各エリアにおいて、複数人の視聴者30の位置にそれぞれ応じた複数種類の個別最低発光輝度補償値のうちの最大の個別最低発光輝度補償値が最低発光輝度補償値として設定される。このため、各視聴者の位置を考慮して最低発光輝度補償値が設定される。そして、この最低発光輝度補償値を用いて最低発光輝度持ち上げ設定が行われることにより、パネルサイズが大きい液晶表示装置において、複数人の視聴者30が正面エリアから離れたエリアなどを見る場合でも、ハロを抑制することができる。ここで、最低発光輝度補償値は、各視聴者30に関する個別最低発光輝度補償値の最大値よりも大きな値にはならないので、視聴者30が複数人である場合でも、コントラストの低下を抑制することができる。なお、視聴者30が一人である場合および視聴者30が複数人である場合のいずれにおいても、上述のように最低発光輝度が適切に設定されるので、バックライト12の駆動電力の増大をも抑制することができる。
上記ステップS8では、複数人の視聴者30に関する各エリアの個別最低発光輝度補償値のうちの最大の個別最低発光輝度補償値を、最低発光輝度補償部172で使用される当該エリアの最低発光輝度補償値として設定するものとしてが、本発明はこれに限定されるものではない。例えば、上記第2の実施形態の変形例として、複数人の視聴者30に関する各エリアの個別最低発光輝度補償値の平均値を当該エリアの最低発光輝度補償値として設定しても良い。本変形例によれば、上記第2の実施形態よりもハロの抑制効果は劣ることになるが、コントラストの低下およびバックライト12の駆動電力の増大をさらに抑制することができる。
上記第1の実施形態および第2の実施形態における顔検出はカメラ画像に基づいて行われるので、視聴環境の明るさ(以下「環境輝度」という。)が十分ではない場合に、当該顔検出の精度が低下するおそれがある。なお、視聴中は画面自体の明るさにより環境輝度をある程度高く維持することができるが、例えば映画鑑賞時のように室内を暗くして視聴するような場合には特に、環境輝度は顔検出に不十分となる。本発明の第3の実施形態は、このような顔検出の精度の低下を抑制するものである。
図15は、本発明の第3の実施形態に係る液晶表示装置10の構成を示すブロック図である。本実施形態に係る液晶表示装置10は、図15に示すように、上記第1の実施形態に係る液晶表示装置10の構成要素として照明部18を加えたものである。照明部18は、図16に示すように、照明181および照明輝度調整部182を含んでいる。照明181は、視聴者30を照らす。照明輝度調整部182は、環境輝度に応じて照明181の輝度(以下「照明輝度」という。)を調整する。照明181は、例えば図17に示すように、ディスプレイ21の上辺に設置されている。なお、照明181の数および設置位置はこれに限定されるものではない。また、照明輝度調整部182はディスプレイ21中に含まれているものとする。
本実施形態によれば、環境輝度が顔検出に十分でない場合に、照明181の照明輝度が高くなるように調整される。このため、顔検出精度の低下を抑制することができる。また、カメラ画像から環境輝度を取得するので、別途センサなどを設ける必要がない。
図18に示すフローチャートでは、現在の環境輝度が視聴者30の顔検出に不十分である場合にのみステップS3,S4を行うものとして説明したが本発明はこれに限定されるものではない。例えば、上記第3の実施形態の変形例として、ステップS2を行うことなく、ステップS3において現在の環境輝度に対応する照明輝度を求め、求めた照明輝度を照明181の照明輝度とするようにしても良い。これにより、例えば現在の環境輝度が環境輝度閾値よりも十分に高く、かつ、照明輝度が必要以上に高くなっている場合に、図19の関係式に基づいて照明181の照明輝度を適切な高さに設定することにより、照明181の消費電力を低減することができる。
また、上記各実施形態では、視聴者情報取得部としてカメラ画像取得部15を用いるものとして説明したが、本発明はこれに限定されるものではなく、その他種々の視聴者情報(特に視聴者の位置および/または人数に関する情報)を取得するための装置を採用することができる。例えば、カメラ画像取得部15に代えて、超音波センサまたは赤外線センサ(以下、これらをまとめて単に「センサ」という。)などを用いることができる。この場合、標準的な視聴範囲内の想定される視聴者位置に対して互いに異なる方向に向けた複数個のセンサを、ディスプレイの額縁上などに並べて配置することができる。このようなセンサは送信機および受信機を対とし、通常はセンサを向けた光軸上の物体しか検知しないので、互いに異なる方向に向けた複数個のセンサを用いることにより、視聴者が複数人存在する際の視聴者数および/または視聴者の位置を検出できる。
6…LEDユニット(光源)
7…LED
10…液晶表示装置
11…液晶パネル(表示パネル)
12…バックライト
13…パネル駆動回路
14…バックライト駆動回路
15…カメラ画像取得部(視聴者情報取得部)
16…エリアアクティブ駆動調整部
17…エリアアクティブ駆動処理部
18…照明部
21…ディスプレイ
30…視聴者
151…カメラ
152…カメラ画像処理部
161…顔検出部
162…補償値算出部
171…発光輝度算出部
172…最低発光輝度補償部
173…表示輝度算出部
174…液晶データ算出部
181…照明
182…照明輝度調整部
Claims (18)
- バックライトの輝度を制御する機能を有する表示装置であって、
複数の表示素子を含む表示パネルと、
複数の光源を含むバックライトと、
前記視聴者の位置に関する情報を少なくとも含む視聴者情報を取得する視聴者情報取得部と、
前記視聴者情報に基づいて前記バックライトの輝度制御に関する情報を求める駆動調整部と、
入力画像を複数のエリアに分割し、各エリアに対応した入力画像および前記バックライトの輝度制御に関する情報に基づき、各エリアに対応した光源の発光輝度を求める駆動処理部と、
前記駆動処理部により求められた発光輝度に基づき、前記バックライトに対して前記光源の輝度を制御する信号を出力するバックライト駆動部と、
少なくとも前記入力画像に関する情報から求められる前記表示パネルの光透過制御に関する情報に基づき、前記表示パネルに対して前記表示素子の光透過率を制御する信号を出力するパネル駆動部とを備えることを特徴とする、表示装置。 - 前記バックライトの輝度制御に関する情報は、前記バックライトの最低発光輝度を示す最低発光輝度補償値を含み、
前記駆動処理部は、前記駆動調整部から受信した最低発光輝度補償値に基づき、前記バックライトの発光輝度を補正することを特徴とする、請求項1に記載の表示装置。 - 前記駆動調整部は、前記最低発光輝度補償値を、前記視聴者の位置に関する情報から得られる当該視聴者の位置に基づいて求めることを特徴とする、請求項2に記載の表示装置。
- 前記視聴者情報は、前記視聴者の人数に関する情報をさらに含み、
前記駆動調整部は、
前記視聴者の人数が一人である場合には、当該視聴者に関して当該視聴者の位置に応じて決定される、前記バックライトの最低発光輝度を示す個別最低発光輝度補償値を前記最低発光輝度補償値として求め、
前記視聴者の人数が複数人である場合には、各視聴者に関する個別最低発光輝度補償値に基づいて前記最低発光輝度補償値を求めることを特徴とする、請求項3に記載の表示装置。 - 前記個別最低発光輝度補償値および前記最低発光輝度補償値のそれぞれは、全エリアで一律に設定され、
前記視聴者に関する個別最低発光輝度補償値は、前記表示パネルの中心に対する当該視聴者の位置に応じて設定されることを特徴とする、請求項4に記載の表示装置。 - 前記視聴者数が複数人である場合の前記最低発光輝度補償値は、複数人の視聴者に関する個別最低発光輝度補償値のうちの最大の個別最低発光輝度補償値であることを特徴とする、請求項5に記載の表示装置。
- 前記視聴者に関する個別最低発光輝度補償値は、前記表示パネルの中心における法線に対する当該視聴者の位置の角度が大きいほど大きくなるように設定されることを特徴とする、請求項6に記載の表示装置。
- 前記個別最低発光輝度補償値および前記最低発光輝度補償値のそれぞれは、所定数のエリア毎に設定され、
前記視聴者に関する前記所定数のエリア毎の個別最低発光輝度補償値は、当該所定数のエリアが当該視聴者の正面のエリアから離れているほど大きくなるように設定されることを特徴とする、請求項4に記載の表示装置。 - 前記視聴者の人数が複数人である場合の、前記所定数のエリア毎の最低発光輝度補償値は、複数人の視聴者に関する当該所定数のエリア毎の個別最低発光輝度補償値のうちの最大の個別最低発光輝度補償値であることを特徴とする、請求項8に記載の表示装置。
- 前記視聴者情報取得部は、視聴者を撮影した画像を、前記視聴者情報として取得するカメラを含むことを特徴とする、請求項3または4に記載の表示装置。
- 前記駆動調整部は、前記視聴者を撮影した画像から当該視聴者の顔を検出して前記表示パネルに対する当該顔の位置を取得することにより、少なくとも当該視聴者の位置を求めることを特徴とする、請求項10に記載の表示装置。
- 前記視聴者を照らす照明と、
視聴環境の明るさに応じて前記照明の輝度を調整する照明輝度調整部とをさらに備えることを特徴とする、請求項11に記載の表示装置。 - 前記照明輝度調整部は、前記視聴者を撮影した画像から前記視聴環境の明るさを取得することを特徴する、請求項12に記載の表示装置。
- 前記駆動処理部はさらに、各エリアに対応した入力画像に関する情報および各エリアに対応した光源の発光輝度に基づいて、前記表示パネルの光透過制御に関する情報を求めることを特徴とする、請求項1から4までのいずれか1項に記載の表示装置。
- 複数の表示素子を含む表示パネルと、複数の光源を含むバックライトとを備え、前記バックライトの輝度を制御する機能を有する表示装置における表示方法であって、
前記視聴者の位置に関する情報を少なくとも含む視聴者情報を取得する視聴者情報取得ステップと、
前記視聴者情報に基づいて前記バックライトの輝度制御に関する情報を求めるステップと、
入力画像を複数のエリアに分割し、各エリアに対応した入力画像および前記バックライトの輝度制御に関する情報に基づき、各エリアに対応した光源の発光輝度を求める駆動調整ステップと、
前記駆動処理ステップで求められた発光輝度に基づき、前記バックライトに対して前記光源の輝度を制御する信号を出力するバックライト駆動ステップと、
少なくとも前記入力画像に関する情報から求められる前記表示パネルの光透過制御に関する情報に基づき、前記表示パネルに対して前記表示素子の光透過率を制御する信号を出力するパネル駆動ステップとを備えることを特徴とする、表示方法。 - 前記バックライトの輝度制御に関する情報は、前記バックライトの最低発光輝度を示す最低発光輝度補償値を含み、
前記駆動処理ステップでは、前記駆動調整ステップで求められた最低発光輝度補償値に基づき、前記バックライトの発光輝度が補正されることを特徴とする、請求項15に記載の表示方法。 - 前記駆動調整ステップでは、前記最低発光輝度補償値は、前記視聴者の位置に関する情報から得られる当該視聴者の位置に基づいて求められることを特徴とする、請求項16に記載の表示方法。
- 前記視聴者情報は、前記視聴者の人数に関する情報をさらに含み、
前記駆動調整ステップでは、
前記視聴者の人数が一人である場合には、当該視聴者に関して当該視聴者の位置に応じて決定される、前記バックライトの最低発光輝度を示す個別最低発光輝度補償値が前記最低発光輝度補償値として求められ、
前記視聴者の人数が複数人である場合には、各視聴者に関する個別最低発光輝度補償値に基づいて前記最低発光輝度補償値が求められることを特徴とする、請求項17に記載の表示方法。
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