WO2018070013A1 - Control device and program - Google Patents

Control device and program Download PDF

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Publication number
WO2018070013A1
WO2018070013A1 PCT/JP2016/080364 JP2016080364W WO2018070013A1 WO 2018070013 A1 WO2018070013 A1 WO 2018070013A1 JP 2016080364 W JP2016080364 W JP 2016080364W WO 2018070013 A1 WO2018070013 A1 WO 2018070013A1
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WO
WIPO (PCT)
Prior art keywords
gaze area
gradation
unit
area
light amount
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Application number
PCT/JP2016/080364
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French (fr)
Japanese (ja)
Inventor
昭憲 林
裕介 伴場
貴文 川上
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Eizo株式会社
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Application filed by Eizo株式会社 filed Critical Eizo株式会社
Priority to PCT/JP2016/080364 priority Critical patent/WO2018070013A1/en
Publication of WO2018070013A1 publication Critical patent/WO2018070013A1/en

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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
    • 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
    • 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
    • G09G3/36—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 using liquid crystals

Definitions

  • the present invention relates to a control device and a program capable of making the luminance observed from the outside of the display device constant.
  • a digital signal processing unit includes an input signal characteristic for each pixel in the display unit and The pixel value correction is performed by applying a correction coefficient calculated based on the difference from the input signal characteristic of the reference pixel, and the backlight control unit is configured to detect high luminance corresponding luminance unevenness when the high luminance signal is output to the display unit.
  • a method of executing backlight luminance control using a backlight luminance correction coefficient calculated using a measurement result of luminance unevenness corresponding to low luminance when a low luminance signal is output is disclosed.
  • the luminance unevenness of the display device can be reduced by digital signal processing and backlight control, it can be applied only to a display device capable of dividing and controlling the backlight.
  • the present invention has been made in view of such circumstances, and it is possible to maximize the gradation expression capability of a display device while reducing luminance unevenness perceived by a user without performing split control of the backlight.
  • a control device and a program are provided.
  • a light amount adjustment unit that adjusts the light amount of the backlight of the display device, and a gaze area determination unit that determines a user's gaze area in the display unit of the display device, the light amount adjustment unit, The amount of light of the backlight is adjusted in accordance with the movement of the gaze area so that the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input to the gaze area is constant.
  • a control device configured to do is provided.
  • the amount of light of the backlight is adjusted with the movement of the gaze area, and the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input is constant. Therefore, the observation luminance viewed by the user can be kept apparently constant. For this reason, luminance unevenness felt by the user is reduced.
  • the number of gradations that can be input to the display device for unevenness correction it is possible to maximize the gradation expression capability of the display device.
  • the light amount adjustment unit readjusts the light amount of the backlight when the gaze area moves.
  • the light amount adjustment unit has a target whose observation luminance observed from outside is predetermined when a predetermined gradation value is input to the gaze area based on unevenness information of the display unit.
  • the light amount of the backlight is adjusted so as to obtain the observation luminance.
  • the light amount adjusting unit adjusts the light amount of the backlight based on an adjustment coefficient calculated based on the unevenness information and the target observation luminance.
  • the adjustment coefficient is a luminance ratio between the unevenness information and the gaze area.
  • a gradation correction unit that corrects a gradation level of input image data input to the display device
  • the gradation correction unit is configured to perform gradation levels of other areas based on unevenness information of the gaze area.
  • a gradation correction unit that corrects a gradation level of input image data input to the display device
  • the gradation correction unit has a gradation resolution of the gaze area higher than that of other areas.
  • the gradation level of the other area is corrected so as to be higher.
  • an acquisition unit that acquires the unevenness information is provided, and the gradation correction unit changes the unevenness information so that a gradation correction value in the gaze area becomes zero.
  • the gradation correction unit corrects the gradation level when the gaze area moves.
  • the gradation correction unit corrects the gradation level based on the observation luminance of the gaze area and the observation luminance of other areas.
  • the unevenness information is a distribution of observation luminance on the display unit.
  • the gaze area determining unit determines the gaze area based on coordinate data representing a position of a user's line of sight.
  • the computer functions as a light amount adjustment unit that adjusts a light amount of a backlight of the display device, and a gaze area determination unit that determines a user's gaze area in the display unit of the display device, and the light amount adjustment unit includes The amount of light of the backlight is adjusted in accordance with the movement of the gaze area so that the observation luminance observed from the outside in the gaze area becomes constant when a predetermined gradation value is input to the gaze area.
  • a control program configured as described above is provided.
  • the control device 1 includes a processing unit 10, a storage unit 20, an operation unit 30, a display unit 40, a backlight 50, and a communication unit 60.
  • the processing unit 10 executes various arithmetic processes, and is configured by, for example, a CPU.
  • the storage unit 20 stores various data and programs, and includes, for example, a memory, a cache, an HDD, an SSD, or the like.
  • the program may be preinstalled at the time of shipment of the control device 1, may be downloaded as an application from a site on the Web, or may be transferred from another information processing device by wireless communication.
  • the operation unit 30 operates the control device 1 and includes, for example, a motion recognition device using an operation switch, a touch panel, a keyboard, a voice input unit, a camera, and the like.
  • the display unit 40 displays various images (including still images and moving images), and is composed of a liquid crystal panel, for example.
  • the backlight 50 emits light from the back surface of the display unit 40.
  • the backlight 50 is driven by a driver (not shown).
  • the backlight 50 does not need to be divided and controls the entire light amount collectively.
  • the communication unit 60 transmits / receives various data to / from other information processing apparatuses, and is configured by an arbitrary I / O.
  • the bus 100 is composed of a serial bus, a parallel bus, and the like, and electrically connects each part to enable transmission / reception of various data.
  • the control device 1 is realized by, for example, a program incorporated in a display device in addition to an information processing device such as a PC or a server.
  • the control apparatus 1 is comprised by the liquid crystal display device (liquid crystal display), for example.
  • the control device 1 includes an operation unit 30, a display unit 40, a backlight 50 and a communication unit 60, a processing unit 10, and a storage unit 20.
  • the processing unit 10 includes a line-of-sight detection unit 101, a gaze area determination unit 102, a light amount adjustment unit 103, and a gradation correction unit 104.
  • the storage unit 20 includes a non-uniformity table storage unit 201, a light amount adjustment table storage unit 202, and a gradation correction table storage unit 203.
  • the line-of-sight detection unit 101 detects coordinate data representing the position of the user's line of sight from the line-of-sight detection device.
  • the line-of-sight detection device may be an arbitrary device provided in the control device 1, or may be a type of device that is worn by the user and that transfers coordinate data representing the user's line of sight to the control device 1. Good.
  • the gaze area determination unit 102 determines a user's gaze area on the display unit 40 based on the coordinate data detected by the gaze detection unit 101.
  • the gaze area is an area on the display unit 40 that the user is viewing.
  • the display unit 40 is divided into 25 areas (5 ⁇ 5), and by determining which area the position represented by the coordinate data is included, one of the 25 areas Is determined to be a gaze area.
  • the division number of the display unit 40 is arbitrary, and the vertical and horizontal division numbers may be different.
  • the light amount adjusting unit 103 is configured to adjust the light amount of the backlight 50 as the gaze area is moved, and the observation luminance observed from the outside in the gaze area when a predetermined gradation is input is constant. It is what is done.
  • the observation luminance is the luminance that is actually displayed by the display unit 40 and that is observed by an external sensor.
  • the processing by the light amount adjustment unit 103 is performed based on unevenness information.
  • the unevenness information is a distribution of observation luminance on the display unit 40.
  • the unevenness information includes, for example, the display unit 40 divided into a plurality of areas, and information assigned to each area, specifically, the observation luminance of each area obtained by dividing the display unit 40 into a plurality of areas. And the observation luminance of a predetermined area.
  • the unevenness information is not limited to this, and can be information represented by a predetermined function.
  • the information represented by a predetermined function is represented by a function f (x, y) using a two-dimensional variable (x, y) that specifies coordinates on the display unit 40.
  • the area interpolation function is used. Uneven information can be used.
  • coordinate data representing the position of the user's line of sight is detected by the line-of-sight detection device and the line-of-sight detection unit 101
  • unevenness amount f (x, y)
  • the unevenness information is a ratio between the observation luminance of a specific area when the display unit 40 is displayed at a predetermined intensity and the observation luminance of another area with respect to the observation luminance.
  • the unevenness table T0 (which will be described later with reference to FIG. 4) is a collection of luminance correction coefficients obtained for each area as a ratio. Then, the light amount adjustment unit 103 adjusts the light amount of the backlight 50 based on the adjustment coefficient calculated based on the unevenness information included in the unevenness table T0 and the target observation luminance. Specific processing by the light amount adjusting unit 103 will be described later with reference to FIGS.
  • the gradation correction unit 104 corrects the gradation level of the input image data input to the control device 1.
  • the gradation correction unit 104 corrects the gradation levels of other areas based on the unevenness information of the gaze area. Specifically, the gradation correction unit 104 changes the unevenness information so that the gradation correction value in the gaze area becomes zero. Then, by changing the unevenness information in all areas, a new unevenness table T3 (see FIG. 6) is generated from the unevenness table T0. Thereby, in the gaze area, the maximum performance can be exhibited without causing gradation collapse. Then, the corrected input image data becomes output image data and is displayed on the display unit 40. Specific processing by the gradation correction unit 104 will be described later with reference to FIGS. In the present embodiment, the gradation is assumed to be in 256 levels from 0 (minimum gradation) to 255 (maximum gradation).
  • the gradation correction unit 104 corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area.
  • the gradation resolution of an input video signal to a display device is reduced by unevenness correction.
  • the gradation resolution of “0 to 255” is provided at the time of input to the display device, while such unevenness correction is performed.
  • the gradation resolution is “0 to 230 (approximately 25 reduction in video signal conversion)” when output from the display device.
  • the control apparatus 1 according to the present invention does not operate the input video signal because the gradation correction unit 104 realizes unevenness correction of the gaze position by luminance adjustment. That is, an image can be displayed on the display unit 40 without reducing the gradation resolution of the gaze area.
  • the unevenness table storage unit 201 stores a table representing luminance unevenness in 25 areas. Specifically, as shown in the unevenness table T0 of FIG. 4, when the display unit 40 is displayed at a specific intensity, the ratio of the observation luminance of each area when the observation luminance of the central area is set to 100 It is a table that summarizes. This is because the luminance unevenness occurs in the display unit 40 due to the characteristics of the display unit 40 and light leakage from the backlight 50 even in the same display device. In the present embodiment, a value corresponding to each area in the unevenness table T0 is referred to as unevenness information.
  • the numbers 1 to 5 on the horizontal axis are combined with the numbers 1 to 5 on the vertical axis, and (x: y) Identify.
  • the central area is (3: 3)
  • the uppermost leftmost area is (1: 1).
  • the luminance of the area (1: 1) is 80% with respect to the luminance of the area (3: 3).
  • the reference area need not be (3: 3), and the luminance of an arbitrary area may be set to 100 depending on the situation.
  • the light amount adjustment table storage unit 202 stores a light amount adjustment table T1 (see FIG. 4) used for light amount adjustment processing in the light amount adjustment unit 103.
  • the light amount adjustment table T1 stores an adjustment coefficient calculated based on unevenness information, and is generated using the unevenness information and the luminance ratio of the gaze area.
  • the light amount adjustment table T1 is generated using the luminance ratio between each area and a predetermined area based on the unevenness table T0. A specific method for generating the light amount adjustment table T1 will be described later with reference to FIG.
  • the gradation correction table storage unit 203 stores a gradation correction table T3 (see FIG. 6) used for gradation correction processing in the gradation correction unit 104.
  • the gradation correction table T3 is generated using a luminance ratio between each area and a predetermined area based on the unevenness table T0. A specific method for generating the gradation correction table T3 will be described later with reference to FIG.
  • FIG. 3 is a diagram illustrating an example of a flowchart for performing image processing by the control device 1 according to an embodiment of the present invention.
  • the light amount adjustment unit 103 adjusts the light amount of the backlight 50
  • the gradation correction unit 104 corrects the gradation level of the input image data. Processing is executed in parallel.
  • the light amount adjustment process and the gradation correction process are independent of each other, and the invention is established for each.
  • the line-of-sight detection unit 101 detects coordinate data representing the position of the user's line of sight. Then, the line-of-sight detection unit 101 outputs the coordinate data to the gaze area determination unit 102.
  • the gaze area determination unit 102 determines the user's gaze area on the display unit 40 based on the coordinate data detected by the gaze detection unit 101. Specifically, it is determined which of the 25 areas in the display unit 40 includes the position of the user's line of sight. When the position of the user's line of sight is on the boundary between a plurality of areas, an area close to (3: 3) (center area) may be determined as the gaze area. Then, the gaze area determination unit 102 outputs data representing the determined gaze area to the light amount adjustment unit 103 and the gradation correction unit 104.
  • the light amount adjustment unit 103 performs back movement according to the movement of the gaze area so that the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input to the gaze area is constant.
  • the light quantity of the light 50 is adjusted.
  • the light amount adjustment unit 103 refers to the light amount adjustment table T1 stored in the light amount adjustment table storage unit 202, and represents the light amount of the backlight 50 corresponding to the gaze area determined by the gaze area determination unit 102. To decide. Then, data representing the light amount of the backlight 50 is output to the backlight 50.
  • the predetermined gradation value means a gradation value input to the display device.
  • the predetermined gradation value can be an arbitrary gradation, and can be a maximum gradation, a minimum gradation, an intermediate gradation, or the like.
  • the backlight 50 emits light with the adjusted light quantity.
  • the observation luminance in the gaze area always becomes the visual luminance value.
  • Such light amount adjustment processing is executed every time the gaze area moves. Thereby, even if a gaze area moves because a user's eyes
  • the gradation correction unit 104 corrects gradation levels other than the gaze area based on the unevenness information of the gaze area. Specifically, the gradation correction unit 104 changes the unevenness information so that the gradation correction value in the gaze area becomes zero. And the nonuniformity table T3 is produced
  • the gradation correction unit 104 outputs the unevenness table T3 newly generated from the unevenness table T0 to the gradation correction table storage unit 203.
  • the gradation correction table storage unit 203 stores the unevenness table T3.
  • the display unit 40 displays an image based on the corrected gradation level.
  • the gradation level of the other area is corrected based on the gaze area (in other words, the gradation level of the other area is corrected so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area). By doing so, it is possible to improve the luminance uniformity of the entire display unit 40.
  • the control device 1 executes the light amount adjustment process and the gradation correction process every time the gaze area moves.
  • an area (1: 1) indicated by a thick frame in each of the tables T0 to T2 in FIG. 4 represents a gaze area.
  • the light amount adjustment process is a process for keeping the observation luminance in the gaze area constant when a predetermined gradation value is input.
  • an arbitrary observation luminance is set as the target observation luminance, and the backlight 50 is adjusted so that the observation luminance in the gaze area becomes the target observation luminance even when the gaze area moves. Thereby, even if a gaze area moves, the observation brightness
  • the method of determining the target observation brightness is not particularly limited.
  • the observation brightness in the central area (3: 3) when there is no light amount adjustment by the backlight 50 is set as the target observation brightness or is arbitrarily set by the user.
  • the value may be the target observation luminance.
  • the observation luminance in the central area (3: 3) is set as the target observation luminance when there is no light amount adjustment by the backlight 50.
  • the light amount adjustment processing according to the present embodiment is not executed, for example, when the light amount setting value of the backlight 50 (256 gradations) is 128, the light amount of the backlight 50 is 600 cd / cm 2 . Suppose there is. Since this light is attenuated when passing through the liquid crystal, the observation luminance is smaller than the light amount of the backlight 50.
  • the transmittance of the liquid crystal may vary depending on the location of the display unit 40.
  • the light intensity output from the backlight 50 varies depending on the location. As described above, the observation luminance may be different between the gaze area (1: 1) and the central area (3: 3).
  • the observation luminance in the gaze area (1: 1) that is actually visually recognized by the user is a predetermined target monitoring luminance (observation luminance in the central area (3: 3)).
  • the observation luminance felt by the user can be kept apparently constant.
  • the light amount of the backlight 50 is proportional to the light amount setting value of the backlight 50
  • the amount of light of the backlight 50 is recalculated every time the gaze area moves.
  • the observation luminance in the gaze area always matches the target observation luminance, and the observation luminance in the gaze area becomes constant.
  • the unevenness table T0 is acquired from the unevenness table storage unit 201. That is, the light amount adjustment unit 103 functions as an acquisition unit that divides the display unit 40 into a plurality of areas and acquires the unevenness table T0 assigned to each area. The unevenness information is acquired by acquiring the unevenness table T0.
  • an adjustment coefficient is calculated based on the luminance ratio between each area and the central area (3: 3) to generate a light amount adjustment table T1.
  • “middle information of the central area / unevenness information of each area” is calculated, and the light amount adjustment table T1 is generated.
  • Such a value is an adjustment coefficient calculated based on the unevenness information (unevenness table T0). That is, the adjustment coefficient is a coefficient representing how many times the unevenness information of the gaze area becomes the unevenness information of a predetermined area (center area (3: 3)) from a plurality of areas in the unevenness table T0. .
  • the adjustment coefficient is a coefficient calculated based on the luminance ratio between the unevenness information and the gaze area. In the present embodiment, a value obtained by rounding down the third decimal place is shown.
  • target observation brightness is acquired.
  • the target observation luminance is “300 cd / cm 2 ”.
  • the light amount setting value of the backlight 50 is calculated.
  • the backlight 50 does not execute the division control and adjusts the entire light amount collectively, so the light amount setting value of the backlight 50 for the gaze area (1: 1) is “ In the case of “160”, the backlight 50 as a whole is irradiated with light at a light amount setting value of “160”.
  • the light amount setting value after adjustment of each area in the table T ⁇ b> 2 is illustrated, but actually, only the gaze area (1: 1) needs to be calculated. Then, the light amount setting value is output to the light amount adjustment unit 103.
  • FIG. 5A shows the various tables T0 to T2 and the observation luminance when the gaze area is (1: 1)
  • FIG. 5B shows the various tables T0 to T2 and the observation luminance when the gaze area is (1: 2).
  • the observation luminance of each area in the case of FIG. 5A is “600 ⁇ 0.5 ⁇ ⁇ (unevenness information at T0) / 100 ⁇ ⁇ ⁇ (light intensity setting value of area (1: 1) at T2.
  • the observation luminance of each area in the case of FIG. 5B is “600 ⁇ 0.5 ⁇ ⁇ (unevenness information at T0) / 100 ⁇ ⁇ ⁇ (the light amount setting value of the area (1: 2) at T2).
  • the light amount adjustment process is executed, and even when the gaze area moves, the display device can be controlled so that the observation luminance in the gaze area becomes constant.
  • the light quantity adjustment part 103 can adjust the light quantity of the backlight 50 with the movement of a gaze area, and can make observation brightness observed from the outside in a gaze area constant.
  • a gaze area is acquired.
  • an area (1: 1) indicated by a thick frame in each of the tables T0 and T3 to T7 in FIG. 6 represents a gaze area.
  • the unevenness table T0 is acquired from the unevenness table storage unit 201. That is, the gradation correction unit 104 functions as an acquisition unit that divides the display unit 40 into a plurality of areas and acquires the unevenness table T0 assigned to each area. The unevenness information is acquired by acquiring the unevenness table T0.
  • the input gradation is acquired.
  • the input gradation is a different value for each area in the display unit 40.
  • the input gradation is 128 in the gaze area (1: 1), and the input gradation is 255 in the center area (3: 3).
  • the input gradation is input to the control device 1 by an image data input device (not shown).
  • a table T4 represents the input gradation for each area.
  • the table T3 is generated so that the value of the gaze area (1: 1) is 1, the input floor corresponding to the gaze area (1: 1) as a result of the process in S66.
  • the tone value remains the input tone “128” acquired in S64.
  • the input gradation acquired in S64 is different from the input gradation recalculated in S66.
  • a new table T6 is generated based on the values calculated for each area. That is, in the gradation correction process, the gradation of other areas is corrected based on the gaze area (1: 1).
  • the gradation correction unit 104 corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area.
  • the output gradation is calculated. Specifically, as a result of the calculation in S66, in areas (5: 1) and (5: 4), the gradation exceeds the maximum gradation of 255. However, since such gradation cannot actually be output, the gradation exceeding 255 is uniformly corrected to 255, and a table T7 representing the final output gradation is generated. Then, the output gradation is output to the display unit 40.
  • the gradation correction unit 104 corrects the gradation levels of other areas based on the unevenness information of the gaze area.
  • the unevenness information is information assigned to each area by dividing the display unit 40 into a plurality of areas, and is a part of the unevenness table T0.
  • the unevenness information is a ratio between the observation luminance of each area and the observation luminance of a predetermined area.
  • the unevenness table T3 is generated from the unevenness information (unevenness table T0) so that the gradation correction value in the gaze area becomes 0. Thereafter, in S64, the gradation level is corrected based on the observation luminance of the gaze area and the observation luminance of other areas.
  • the unevenness information is not limited to this, and may be an observation luminance distribution on the display unit 40 without being divided into areas.
  • the gradation correction unit 104 corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area.
  • the gradation level of the other area is corrected based on the gaze area. Therefore, it is possible to eliminate gradation collapse in the gaze area. As a result, the gradation expression of the gaze area is maximized for the user, so that the visibility is improved.
  • the control device 1 can be provided as a set top box connected to a PC, cloud computing, or computer.
  • an ASIC application specific integrated circuit
  • an FPGA field-programmable gate array
  • a DRP dynamic reconfigurable processor
  • a program for realizing the function of the control device 1 can be distributed via the Internet or the like.
  • control device 1 when the control device 1 is provided separately from the display device, the display unit 40 and the backlight 50 are not included in the control device 1. Furthermore, it is good also as a structure which implement
  • information represented by a predetermined function may be used as unevenness information.
  • the amount of unevenness corresponding to the coordinate data representing the position of the user's line of sight may be used, or the average value of the amount of unevenness included in the gaze area may be used.
  • the gaze area may be determined using only coordinate data representing the position of the line of sight of a specific user. . Furthermore, the gaze area may be determined based on coordinate data representing the line of sight of a plurality of users. For example, an average value of coordinate data representing the position of the line of sight of each user may be obtained, and the gaze area may be determined based on the coordinate data.
  • the present invention may be applied to a display device that can control the backlight 50 in a divided manner. In this case, more precise brightness adjustment is possible.
  • control device 10 processing unit 20: storage unit 30: operation unit 40: display unit 50: backlight 60: communication unit 100: bus 101: gaze detection unit 102: gaze area determination unit 103: light amount adjustment unit 104: floor Tone correction unit 201: Unevenness table storage unit 202: Light amount adjustment table storage unit 203: Tone correction table storage unit

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Abstract

The purpose of the present invention is to provide a control device and a program by which it is possible to maximize the gradation expression capability of a display device while reducing unevenness in luminance as perceived by a user, without split control of a backlight. The present invention provides a control device comprising: a light level adjustment unit that adjusts the light level of a backlight of a display device; and a gaze area determination unit that determines the gaze area of a user in a display unit of the display device. The light level adjustment unit is configured so as to adjust the light level of the backlight according to movement of the gaze area such that an observed luminance is uniform, such luminance being observed from an outer portion of the gaze area when a gradation value set in advance for the gaze area is inputted.

Description

制御装置及びプログラムControl device and program
　本発明は、表示装置の外部から観察される輝度を一定にすることが可能な制御装置及びプログラムに関する。 The present invention relates to a control device and a program capable of making the luminance observed from the outside of the display device constant.
　表示装置の視認性を向上させるために、種々の画像処理方法が提案されている。 In order to improve the visibility of the display device, various image processing methods have been proposed.
　特許文献１には、液晶表示装置においてデジタル信号処理とバックライト制御による改良された輝度むら（色むら）補正処理を実現するべく、デジタル信号処理部が、表示部における画素毎の入力信号特性と、基準画素の入力信号特性との差分に基づいて算出された補正係数を適用した画素値補正を実行するとともに、バックライト制御部が、表示部に対する高輝度信号出力時における高輝度対応輝度むらと、低輝度信号出力時における低輝度対応輝度むらの計測結果を利用して算出したバックライト輝度補正係数を適用したバックライト輝度制御を実行する方法が開示されている。 In Patent Document 1, in order to realize improved luminance unevenness (color unevenness) correction processing by digital signal processing and backlight control in a liquid crystal display device, a digital signal processing unit includes an input signal characteristic for each pixel in the display unit and The pixel value correction is performed by applying a correction coefficient calculated based on the difference from the input signal characteristic of the reference pixel, and the backlight control unit is configured to detect high luminance corresponding luminance unevenness when the high luminance signal is output to the display unit. A method of executing backlight luminance control using a backlight luminance correction coefficient calculated using a measurement result of luminance unevenness corresponding to low luminance when a low luminance signal is output is disclosed.
特開２００９－１２８７３３号公報JP 2009-128733 A
　特許文献１の方法によれば、デジタル信号処理及びバックライト制御により表示装置の輝度むらを低減できるが、バックライトを分割制御できる表示装置にしか適用することができない。 According to the method of Patent Document 1, although the luminance unevenness of the display device can be reduced by digital signal processing and backlight control, it can be applied only to a display device capable of dividing and controlling the backlight.
　本発明はこのような事情に鑑みてなされたものであり、バックライトを分割制御することなく、ユーザーが感じる輝度むらを低減しつつ、表示装置の階調表現能力を最大化することが可能な制御装置及びプログラムを提供するものである。 The present invention has been made in view of such circumstances, and it is possible to maximize the gradation expression capability of a display device while reducing luminance unevenness perceived by a user without performing split control of the backlight. A control device and a program are provided.
　本発明によれば、表示装置のバックライトの光量を調整する光量調整部と、前記表示装置の表示部におけるユーザーの注視エリアを決定する注視エリア決定部と、を備え、前記光量調整部は、前記注視エリアに予め定められた階調値が入力されたときの前記注視エリアにおける外部から観察される観察輝度が一定となるように、前記注視エリアの移動に伴って前記バックライトの光量を調整するように構成される、制御装置が提供される。 According to the present invention, a light amount adjustment unit that adjusts the light amount of the backlight of the display device, and a gaze area determination unit that determines a user's gaze area in the display unit of the display device, the light amount adjustment unit, The amount of light of the backlight is adjusted in accordance with the movement of the gaze area so that the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input to the gaze area is constant. A control device configured to do is provided.
　本発明によれば、注視エリアの移動に伴いバックライトの光量を調整し、予め定められた階調値が入力されたときの注視エリアにおける外部から観察される観察輝度が一定となるように構成されるため、ユーザーが見る観察輝度を見かけ上一定に保つことが可能となる。このため、ユーザーが感じる輝度むらが低減される。また、ムラ補正のための表示装置への入力可能な階調数の制限はないため、表示装置の階調表現能力を最大化することが可能となる。 According to the present invention, the amount of light of the backlight is adjusted with the movement of the gaze area, and the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input is constant. Therefore, the observation luminance viewed by the user can be kept apparently constant. For this reason, luminance unevenness felt by the user is reduced. In addition, since there is no limitation on the number of gradations that can be input to the display device for unevenness correction, it is possible to maximize the gradation expression capability of the display device.
　以下、本発明の種々の実施形態を例示する。以下に示す実施形態は互いに組み合わせ可能である。
　好ましくは、前記光量調整部は、前記注視エリアが移動したときに前記バックライトの光量を再調整する。
　好ましくは、前記光量調整部は、前記表示部のムラ情報に基づいて、前記注視エリアに予め定められた階調値が入力されたときに、外部から観察される観察輝度が予め定められた目標観察輝度となるように前記バックライトの光量を調整する。
　好ましくは、前記光量調整部は、前記ムラ情報に基づいて算出される調整係数と前記目標観察輝度とに基づいて、前記バックライトの光量を調整する。
　好ましくは、前記調整係数は、前記ムラ情報と前記注視エリアとの輝度比である。
　好ましくは、前記表示装置に入力される入力画像データの階調レベルを補正する階調補正部を備え、前記階調補正部は、前記注視エリアのムラ情報に基づいて他のエリアの階調レベルを補正する。
　好ましくは、前記表示装置に入力される入力画像データの階調レベルを補正する階調補正部を備え、前記階調補正部は、前記注視エリアの階調分解能が他のエリアの階調分解能より高くなるように前記他のエリアの階調レベルを補正する。
　好ましくは、前記ムラ情報を取得する取得部を備え、前記階調補正部は、前記注視エリアにおける階調補正値が０となるように前記ムラ情報を変更する。
　好ましくは、前記階調補正部は、前記注視エリアが移動したときに前記階調レベルの補正を実行する。
　好ましくは、前記階調補正部は、前記注視エリアの観察輝度と他のエリアの観察輝度とに基づいて、前記階調レベルの補正を実行する。
　好ましくは、前記ムラ情報は、前記表示部における観察輝度の分布である。
　好ましくは、前記注視エリア決定部は、ユーザーの視線の位置を表す座標データに基づいて、前記注視エリアを決定する。
　好ましくは、コンピュータを、表示装置のバックライトの光量を調整する光量調整部、前記表示装置の表示部におけるユーザーの注視エリアを決定する注視エリア決定部、として機能させ、前記光量調整部は、前記注視エリアに予め定められた階調値が入力されたときの前記注視エリアにおける外部から観察される観察輝度が一定となるように、前記注視エリアの移動に伴って前記バックライトの光量を調整するように構成される、制御プログラムが提供される。 Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the light amount adjustment unit readjusts the light amount of the backlight when the gaze area moves.
Preferably, the light amount adjustment unit has a target whose observation luminance observed from outside is predetermined when a predetermined gradation value is input to the gaze area based on unevenness information of the display unit. The light amount of the backlight is adjusted so as to obtain the observation luminance.
Preferably, the light amount adjusting unit adjusts the light amount of the backlight based on an adjustment coefficient calculated based on the unevenness information and the target observation luminance.
Preferably, the adjustment coefficient is a luminance ratio between the unevenness information and the gaze area.
Preferably, a gradation correction unit that corrects a gradation level of input image data input to the display device is provided, and the gradation correction unit is configured to perform gradation levels of other areas based on unevenness information of the gaze area. Correct.
Preferably, a gradation correction unit that corrects a gradation level of input image data input to the display device is provided, wherein the gradation correction unit has a gradation resolution of the gaze area higher than that of other areas. The gradation level of the other area is corrected so as to be higher.
Preferably, an acquisition unit that acquires the unevenness information is provided, and the gradation correction unit changes the unevenness information so that a gradation correction value in the gaze area becomes zero.
Preferably, the gradation correction unit corrects the gradation level when the gaze area moves.
Preferably, the gradation correction unit corrects the gradation level based on the observation luminance of the gaze area and the observation luminance of other areas.
Preferably, the unevenness information is a distribution of observation luminance on the display unit.
Preferably, the gaze area determining unit determines the gaze area based on coordinate data representing a position of a user's line of sight.
Preferably, the computer functions as a light amount adjustment unit that adjusts a light amount of a backlight of the display device, and a gaze area determination unit that determines a user's gaze area in the display unit of the display device, and the light amount adjustment unit includes The amount of light of the backlight is adjusted in accordance with the movement of the gaze area so that the observation luminance observed from the outside in the gaze area becomes constant when a predetermined gradation value is input to the gaze area. A control program configured as described above is provided.
本発明の一実施形態に係る制御装置１のハードウェア構成の例を示す図である。It is a figure which shows the example of the hardware constitutions of the control apparatus 1 which concerns on one Embodiment of this invention. 本発明の一実施形態に係る制御装置１の例示的な機能ブロック図である。It is an exemplary functional block diagram of control device 1 concerning one embodiment of the present invention. 本発明の一実施形態に係る制御装置１による画像処理を実施するためのフローチャートの一例を示す図である。It is a figure which shows an example of the flowchart for implementing the image processing by the control apparatus 1 which concerns on one Embodiment of this invention. 図３における光量調整処理の詳細を説明するためのフローチャートの一例と、各ステップにおいて利用するテーブルの一例を示す図である。It is a figure which shows an example of the flowchart for demonstrating the detail of the light quantity adjustment process in FIG. 3, and an example of the table utilized in each step. 表示部４０に対するユーザーの注視エリアが移動した場合における注視エリアの観察輝度を表す図であり、（ａ）は注視エリアがエリア（１：１）の場合、（ｂ）は注視エリアがエリア（１：２）の場合を表す。It is a figure showing the observation brightness | luminance of a gaze area when the user's gaze area with respect to the display part 40 moves, (a) is an area (1: 1), (b) is an area (1). : Represents the case of 2). 図３における階調補正処理の詳細を説明するためのフローチャートの一例と、各ステップにおいて利用するテーブルの一例を示す図である。It is a figure which shows an example of the flowchart for demonstrating the detail of the gradation correction process in FIG. 3, and an example of the table utilized in each step.
　以下、図面を用いて本発明の実施形態について説明する。以下に示す実施形態中で示した各種特徴事項は、互いに組み合わせ可能である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various characteristic items shown in the following embodiments can be combined with each other.
＜ハードウェア構成＞
　本発明の一実施形態に係る制御装置１のハードウェア構成の例について、図１を用いて説明する。制御装置１は、処理部１０、記憶部２０、操作部３０、表示部４０、バックライト５０及び通信部６０を有する。処理部１０は、種々の演算処理を実行するものであり、例えば、ＣＰＵ等により構成される。記憶部２０は、種々のデータやプログラムを記憶するものであり、例えば、メモリ、キャッシュ、ＨＤＤ又はＳＳＤ等により構成される。ここで、プログラムは、制御装置１の出荷時点においてプリインストールされていてもよく、Ｗｅｂ上のサイトからアプリケーションとしてダウンロードしてもよく、無線通信により他の情報処理装置から転送されてもよい。操作部３０は、制御装置１を操作するものであり、例えば、操作スイッチ、タッチパネル、キーボード、音声入力部、カメラ等を利用した動き認識装置等により構成される。表示部４０は、種々の画像（静止画及び動画を含む）を表示するものであり、例えば、液晶パネルで構成される。バックライト５０は、表示部４０の背面から光を照射するものである。バックライト５０は、図示しないドライバにより駆動される。ここで、本実施形態では、バックライト５０は分割制御する必要はなく、全体の光量をまとめて調整するものである。通信部６０は、他の情報処理装置と種々のデータを送受信するものであり、任意のＩ／Ｏにより構成される。バス１００は、シリアルバス、パラレルバス等で構成され、各部を電気的に接続し、種々のデータの送受信を可能にするものである。 <Hardware configuration>
An example of the hardware configuration of the control device 1 according to an embodiment of the present invention will be described with reference to FIG. The control device 1 includes a processing unit 10, a storage unit 20, an operation unit 30, a display unit 40, a backlight 50, and a communication unit 60. The processing unit 10 executes various arithmetic processes, and is configured by, for example, a CPU. The storage unit 20 stores various data and programs, and includes, for example, a memory, a cache, an HDD, an SSD, or the like. Here, the program may be preinstalled at the time of shipment of the control device 1, may be downloaded as an application from a site on the Web, or may be transferred from another information processing device by wireless communication. The operation unit 30 operates the control device 1 and includes, for example, a motion recognition device using an operation switch, a touch panel, a keyboard, a voice input unit, a camera, and the like. The display unit 40 displays various images (including still images and moving images), and is composed of a liquid crystal panel, for example. The backlight 50 emits light from the back surface of the display unit 40. The backlight 50 is driven by a driver (not shown). Here, in the present embodiment, the backlight 50 does not need to be divided and controls the entire light amount collectively. The communication unit 60 transmits / receives various data to / from other information processing apparatuses, and is configured by an arbitrary I / O. The bus 100 is composed of a serial bus, a parallel bus, and the like, and electrically connects each part to enable transmission / reception of various data.
＜機能ブロック図＞
　次に、制御装置１の機能について、図２の機能ブロック図を用いて説明する。制御装置１は、例えば、ＰＣ、サーバ等の情報処理装置に加え、表示装置に組み込まれたプログラムにより実現される。ここで、本実施形態では、制御装置１は、例えば液晶表示装置（液晶ディスプレイ）により構成される。制御装置１は、操作部３０、表示部４０、バックライト５０及び通信部６０と、処理部１０と、記憶部２０を備える。処理部１０は、視線検出部１０１、注視エリア決定部１０２、光量調整部１０３及び階調補正部１０４を備える。また、記憶部２０は、ムラテーブル記憶部２０１、光量調整テーブル記憶部２０２及び階調補正テーブル記憶部２０３を備える。 <Functional block diagram>
Next, functions of the control device 1 will be described using the functional block diagram of FIG. The control device 1 is realized by, for example, a program incorporated in a display device in addition to an information processing device such as a PC or a server. Here, in this embodiment, the control apparatus 1 is comprised by the liquid crystal display device (liquid crystal display), for example. The control device 1 includes an operation unit 30, a display unit 40, a backlight 50 and a communication unit 60, a processing unit 10, and a storage unit 20. The processing unit 10 includes a line-of-sight detection unit 101, a gaze area determination unit 102, a light amount adjustment unit 103, and a gradation correction unit 104. The storage unit 20 includes a non-uniformity table storage unit 201, a light amount adjustment table storage unit 202, and a gradation correction table storage unit 203.
　操作部３０、表示部４０、バックライト５０及び通信部６０の各機能については、図１の説明を参照されたい。 For the functions of the operation unit 30, the display unit 40, the backlight 50, and the communication unit 60, refer to the description of FIG.
＜処理部１０＞
　次に、処理部１０の機能について説明する。視線検出部１０１は、視線検出装置から、ユーザーの視線の位置を表す座標データを検出するものである。ここで、視線検出装置は、制御装置１に設けられた任意の装置であってもよく、ユーザーが装着し、ユーザーの視線を表す座標データを制御装置１に転送するタイプの装置であってもよい。 <Processing unit 10>
Next, functions of the processing unit 10 will be described. The line-of-sight detection unit 101 detects coordinate data representing the position of the user's line of sight from the line-of-sight detection device. Here, the line-of-sight detection device may be an arbitrary device provided in the control device 1, or may be a type of device that is worn by the user and that transfers coordinate data representing the user's line of sight to the control device 1. Good.
　注視エリア決定部１０２は、視線検出部１０１が検出した座標データに基づいて、表示部４０におけるユーザーの注視エリアを決定するものである。ここで、注視エリアとは、ユーザーが目視している表示部４０上のエリアのことである。本実施形態では、表示部４０を２５個のエリア（５×５）に分割し、座標データが表す位置がどのエリアに含まれるかを判定することで、２５個のエリアのうちの１のエリアを注視エリアであると決定する。なお、表示部４０の分割数は任意であり、縦、横の分割数を異ならせてもよい。 The gaze area determination unit 102 determines a user's gaze area on the display unit 40 based on the coordinate data detected by the gaze detection unit 101. Here, the gaze area is an area on the display unit 40 that the user is viewing. In this embodiment, the display unit 40 is divided into 25 areas (5 × 5), and by determining which area the position represented by the coordinate data is included, one of the 25 areas Is determined to be a gaze area. The division number of the display unit 40 is arbitrary, and the vertical and horizontal division numbers may be different.
　光量調整部１０３は、注視エリアの移動に伴いバックライト５０の光量を調整し、予め定められた階調が入力されたときの注視エリアにおける外部から観察される観察輝度が一定となるように構成されるものである。ここで、観察輝度とは、実際に表示部４０が表示している輝度であって、外部のセンサーにより観察される輝度のことである。 The light amount adjusting unit 103 is configured to adjust the light amount of the backlight 50 as the gaze area is moved, and the observation luminance observed from the outside in the gaze area when a predetermined gradation is input is constant. It is what is done. Here, the observation luminance is the luminance that is actually displayed by the display unit 40 and that is observed by an external sensor.
　また、光量調整部１０３による処理は、ムラ情報に基づいてなされる。ここで、ムラ情報とは、表示部４０における観察輝度の分布である。本実施形態では、ムラ情報は、例えば、表示部４０を複数のエリアに分割し、各エリアに割り当てられた情報、具体的には、表示部４０を複数のエリアに分割した各エリアの観察輝度と、予め定められたエリアの観察輝度との比である。しかし、ムラ情報はこれに限らず、所定の関数で表される情報等とすることができる。ここで、所定の関数で表される情報とは、表示部４０上の座標を特定する２次元の変数（ｘ，ｙ）を用いた関数ｆ（ｘ，ｙ）で表されるものである。また、上記本実施形態においても、注視エリアと、表示部４０が分割された各エリアに対応するムラ情報を表すテーブルにおけるエリアのサイズ又は位置が不一致である場合には、エリア補間する関数で表されるムラ情報を利用することもできる。これにより、視線検出装置及び視線検出部１０１によりユーザーの視線の位置を表す座標データが検出されると、「ムラ量＝ｆ（ｘ，ｙ）により注視位置（ユーザーの視線の位置）のムラ量を算出することができる。 Further, the processing by the light amount adjustment unit 103 is performed based on unevenness information. Here, the unevenness information is a distribution of observation luminance on the display unit 40. In the present embodiment, the unevenness information includes, for example, the display unit 40 divided into a plurality of areas, and information assigned to each area, specifically, the observation luminance of each area obtained by dividing the display unit 40 into a plurality of areas. And the observation luminance of a predetermined area. However, the unevenness information is not limited to this, and can be information represented by a predetermined function. Here, the information represented by a predetermined function is represented by a function f (x, y) using a two-dimensional variable (x, y) that specifies coordinates on the display unit 40. Also in the present embodiment, when the size or position of the area in the table representing the unevenness information corresponding to each area into which the display unit 40 is divided does not coincide with the gaze area, the area interpolation function is used. Uneven information can be used. Thus, when coordinate data representing the position of the user's line of sight is detected by the line-of-sight detection device and the line-of-sight detection unit 101, “the amount of unevenness of the gaze position (the position of the user's line of sight) by“ unevenness amount = f (x, y) ”. Can be calculated.
　ここで、本実施形態では、ムラ情報は、予め定められた強度で表示部４０を表示させたときにおける特定エリアの観察輝度と、かかる観察輝度に対する他のエリアの観察輝度との比率である。そして、エリア毎に求めた輝度の補正係数を比率としてまとめたものがムラテーブルＴ０（図４を用いて後述）である。そして、光量調整部１０３は、ムラテーブルＴ０に含まれるムラ情報に基づいて算出される調整係数と、目標観察輝度とに基づいて、バックライト５０の光量を調整する。なお、光量調整部１０３による具体的な処理は、図３～図５を用いて後述する。 Here, in the present embodiment, the unevenness information is a ratio between the observation luminance of a specific area when the display unit 40 is displayed at a predetermined intensity and the observation luminance of another area with respect to the observation luminance. The unevenness table T0 (which will be described later with reference to FIG. 4) is a collection of luminance correction coefficients obtained for each area as a ratio. Then, the light amount adjustment unit 103 adjusts the light amount of the backlight 50 based on the adjustment coefficient calculated based on the unevenness information included in the unevenness table T0 and the target observation luminance. Specific processing by the light amount adjusting unit 103 will be described later with reference to FIGS.
　階調補正部１０４は、制御装置１に入力される入力画像データの階調レベルを補正するものである。階調補正部１０４は、注視エリアのムラ情報に基づいて他のエリアの階調レベルを補正する。具体的には、階調補正部１０４は、注視エリアにおける階調補正値が０となるようにムラ情報を変更する。そして、全てのエリアにおけるムラ情報を変更することで、ムラテーブルＴ０から新たなムラテーブルＴ３（図６参照）を生成する。これにより、注視エリアにおいては、階調潰れが生じることなく、最大性能を発揮することができる。そして、補正後の入力画像データが、出力画像データとなり、表示部４０に表示される。なお、階調補正部１０４による具体的な処理は、図３及び図６を用いて後述する。また、本実施形態では、階調は０（最低階調）～２５５（最大階調）の２５６段階であるとする。 The gradation correction unit 104 corrects the gradation level of the input image data input to the control device 1. The gradation correction unit 104 corrects the gradation levels of other areas based on the unevenness information of the gaze area. Specifically, the gradation correction unit 104 changes the unevenness information so that the gradation correction value in the gaze area becomes zero. Then, by changing the unevenness information in all areas, a new unevenness table T3 (see FIG. 6) is generated from the unevenness table T0. Thereby, in the gaze area, the maximum performance can be exhibited without causing gradation collapse. Then, the corrected input image data becomes output image data and is displayed on the display unit 40. Specific processing by the gradation correction unit 104 will be described later with reference to FIGS. In the present embodiment, the gradation is assumed to be in 256 levels from 0 (minimum gradation) to 255 (maximum gradation).
　また、他の観点では、階調補正部１０４は、注視エリアの階調分解能が他のエリアの階調分解能より高くなるように、他のエリアの階調レベルを補正する。ここで、階調分解能とは、階調値を表すデータの細かさのことをいう。かかる階調分解能は、入力ビデオ信号のｂｉｔ数で決定される。例えば、入力ビデオ信号が８ｂｉｔの場合、階調分解能は「２＾８＝２５６」となる。また、入力ビデオ信号が１０ｂｉｔの場合、階調分解能は「２＾１０＝１０２４」となる。 In another aspect, the gradation correction unit 104 corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area. Here, gradation resolution refers to the fineness of data representing gradation values. Such gradation resolution is determined by the number of bits of the input video signal. For example, when the input video signal is 8 bits, the gradation resolution is “2 ＾ 8 = 256”. When the input video signal is 10 bits, the gradation resolution is “2「 10 = 1024 ”.
　一般的に、表示装置への入力ビデオ信号は、ムラ補正によってその階調分解能が減少する。例えば、ムラ補正により輝度を約１０［％］（ビデオ信号換算で約２５）低下させた場合には、表示装置への入力時において「０～２５５」の階調分解能を有する一方、かかるムラ補正により、表示装置からの出力時には階調分解能は「０～２３０（ビデオ信号換算で約２５低下）」となる。このように、階調分解能とムラ補正性能はトレードオフの関係にある。本発明に係る制御装置１は、階調補正部１０４によって注視位置のムラ補正を輝度調整で実現するため、入力ビデオ信号を操作しない。つまり、注視エリアの階調分解能を低下させることなく、表示部４０に画像を表示することが可能となる。 Generally, the gradation resolution of an input video signal to a display device is reduced by unevenness correction. For example, when the luminance is reduced by about 10 [%] (about 25 in terms of video signal) by unevenness correction, the gradation resolution of “0 to 255” is provided at the time of input to the display device, while such unevenness correction is performed. As a result, the gradation resolution is “0 to 230 (approximately 25 reduction in video signal conversion)” when output from the display device. Thus, the gradation resolution and the unevenness correction performance are in a trade-off relationship. The control apparatus 1 according to the present invention does not operate the input video signal because the gradation correction unit 104 realizes unevenness correction of the gaze position by luminance adjustment. That is, an image can be displayed on the display unit 40 without reducing the gradation resolution of the gaze area.
＜記憶部２０＞
　次に、記憶部２０の機能について説明する。ムラテーブル記憶部２０１は、２５個のエリアにおける輝度ムラを表すテーブルを記憶するものである。具体的には、図４のムラテーブルＴ０に示されるように、ある特定の強度で表示部４０を表示させたときにおいて、中央エリアの観察輝度を１００とした場合における各エリアの観察輝度の比率をまとめたテーブルである。これは、同じ表示装置でも、表示部４０の特性やバックライト５０からの光漏れにより、表示部４０内において輝度ムラが生じるので、かかる輝度ムラを出荷前に測定し、まとめたものである。なお、本実施形態では、ムラテーブルＴ０における各エリアに対応する値をムラ情報という。ここで、本実施形態では、各エリアを特定する場合、横軸に振られた１～５までの数字と、縦軸に振られた１～５までの数字を組み合わせ、（ｘ：ｙ）で特定する。例えば、中央エリアは（３：３）、最上段左端エリアは（１：１）となる。本実施形態では、エリア（３：３）の輝度に対して、エリア（１：１）の輝度は８０％となることを表す。なお、基準エリアを（３：３）とする必要はなく、状況に応じて任意のエリアの輝度を１００としてもよい。 <Storage unit 20>
Next, functions of the storage unit 20 will be described. The unevenness table storage unit 201 stores a table representing luminance unevenness in 25 areas. Specifically, as shown in the unevenness table T0 of FIG. 4, when the display unit 40 is displayed at a specific intensity, the ratio of the observation luminance of each area when the observation luminance of the central area is set to 100 It is a table that summarizes. This is because the luminance unevenness occurs in the display unit 40 due to the characteristics of the display unit 40 and light leakage from the backlight 50 even in the same display device. In the present embodiment, a value corresponding to each area in the unevenness table T0 is referred to as unevenness information. Here, in this embodiment, when specifying each area, the numbers 1 to 5 on the horizontal axis are combined with the numbers 1 to 5 on the vertical axis, and (x: y) Identify. For example, the central area is (3: 3), and the uppermost leftmost area is (1: 1). In the present embodiment, the luminance of the area (1: 1) is 80% with respect to the luminance of the area (3: 3). Note that the reference area need not be (3: 3), and the luminance of an arbitrary area may be set to 100 depending on the situation.
　光量調整テーブル記憶部２０２は、光量調整部１０３における光量調整処理に用いる光量調整テーブルＴ１（図４参照）を記憶するものである。光量調整テーブルＴ１は、ムラ情報に基づいて算出される調整係数を格納するものであり、ムラ情報と注視エリアの輝度比を用いて生成される。本実施形態では、光量調整テーブルＴ１は、ムラテーブルＴ０に基づいて、各エリアと予め定められたエリアの輝度比を用いて生成される。なお、光量調整テーブルＴ１の具体的な生成手法については、図４を用いて後述する。 The light amount adjustment table storage unit 202 stores a light amount adjustment table T1 (see FIG. 4) used for light amount adjustment processing in the light amount adjustment unit 103. The light amount adjustment table T1 stores an adjustment coefficient calculated based on unevenness information, and is generated using the unevenness information and the luminance ratio of the gaze area. In the present embodiment, the light amount adjustment table T1 is generated using the luminance ratio between each area and a predetermined area based on the unevenness table T0. A specific method for generating the light amount adjustment table T1 will be described later with reference to FIG.
　階調補正テーブル記憶部２０３は、階調補正部１０４における階調補正処理に用いる階調補正テーブルＴ３（図６参照）を記憶するものである。階調補正テーブルＴ３は、ムラテーブルＴ０に基づいて、各エリアと予め定められたエリアの輝度比を用いて生成される。なお、階調補正テーブルＴ３の具体的な生成手法については、図６を用いて後述する。 The gradation correction table storage unit 203 stores a gradation correction table T3 (see FIG. 6) used for gradation correction processing in the gradation correction unit 104. The gradation correction table T3 is generated using a luminance ratio between each area and a predetermined area based on the unevenness table T0. A specific method for generating the gradation correction table T3 will be described later with reference to FIG.
　次に、以上説明した種々の機能及び処理の詳細について、図３～図６を用いて説明する。 Next, details of the various functions and processes described above will be described with reference to FIGS.
＜メインフロー＞
　図３は、本発明の一実施形態に係る制御装置１による画像処理を実施するためのフローチャートの一例を示す図である。図３に示されるように、本実施形態では、光量調整部１０３がバックライト５０の光量を調整する光量調整処理と、階調補正部１０４が入力画像データの階調レベルを補正する階調補正処理とが並列して実行される。なお、光量調整処理及び階調補正処理は互いに独立しており、それぞれについて発明が成立する。 <Main flow>
FIG. 3 is a diagram illustrating an example of a flowchart for performing image processing by the control device 1 according to an embodiment of the present invention. As shown in FIG. 3, in this embodiment, the light amount adjustment unit 103 adjusts the light amount of the backlight 50, and the gradation correction unit 104 corrects the gradation level of the input image data. Processing is executed in parallel. The light amount adjustment process and the gradation correction process are independent of each other, and the invention is established for each.
　まず、Ｓ１において、視線検出部１０１がユーザーの視線の位置を表す座標データを検出する。そして、視線検出部１０１は、かかる座標データを注視エリア決定部１０２に出力する。 First, in S1, the line-of-sight detection unit 101 detects coordinate data representing the position of the user's line of sight. Then, the line-of-sight detection unit 101 outputs the coordinate data to the gaze area determination unit 102.
　次に、Ｓ２において、注視エリア決定部１０２が、視線検出部１０１が検出した座標データに基づいて、表示部４０におけるユーザーの注視エリアを決定する。具体的には、表示部４０における２５個のエリアのうち、いずれのエリアにユーザーの視線の位置が含まれるかを決定する。なお、ユーザーの視線の位置が複数のエリアの境界上にある場合には、（３：３）（中央エリア）に近いエリアを注視エリアとして決定してもよい。そして、注視エリア決定部１０２は、決定した注視エリアを表すデータを、光量調整部１０３及び階調補正部１０４に出力する。 Next, in S2, the gaze area determination unit 102 determines the user's gaze area on the display unit 40 based on the coordinate data detected by the gaze detection unit 101. Specifically, it is determined which of the 25 areas in the display unit 40 includes the position of the user's line of sight. When the position of the user's line of sight is on the boundary between a plurality of areas, an area close to (3: 3) (center area) may be determined as the gaze area. Then, the gaze area determination unit 102 outputs data representing the determined gaze area to the light amount adjustment unit 103 and the gradation correction unit 104.
　次に、光量調整部１０３による光量調整処理について説明する。Ｓ３において、光量調整部１０３は、注視エリアに予め定められた階調値が入力されたときの注視エリアにおける外部から観察される観察輝度が一定となるように、注視エリアの移動に伴ってバックライト５０の光量を調整する。このとき、光量調整部１０３は、光量調整テーブル記憶部２０２に記憶されている光量調整テーブルＴ１を参照し、注視エリア決定部１０２により決定された注視エリアに対応するバックライト５０の光量を表すデータを決定する。そして、バックライト５０の光量を表すデータをバックライト５０に出力する。 Next, the light amount adjustment processing by the light amount adjustment unit 103 will be described. In S <b> 3, the light amount adjustment unit 103 performs back movement according to the movement of the gaze area so that the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input to the gaze area is constant. The light quantity of the light 50 is adjusted. At this time, the light amount adjustment unit 103 refers to the light amount adjustment table T1 stored in the light amount adjustment table storage unit 202, and represents the light amount of the backlight 50 corresponding to the gaze area determined by the gaze area determination unit 102. To decide. Then, data representing the light amount of the backlight 50 is output to the backlight 50.
　ここで、予め定められた階調値とは、表示装置に入力される階調値を意味する。予め定められた階調値は、任意の階調とすることができ、最大階調、最低階調、中間階調等とすることができる。 Here, the predetermined gradation value means a gradation value input to the display device. The predetermined gradation value can be an arbitrary gradation, and can be a maximum gradation, a minimum gradation, an intermediate gradation, or the like.
　次に、Ｓ４において、バックライト５０は、調整された光量で光を照射する。これにより、注視エリアにおける観察輝度が常に目視輝度値となる。なお、かかる光量調整処理は、注視エリアが移動する度に実行される。これにより、ユーザーの視線が移動することにより注視エリアが移動しても、注視エリアにおける観察輝度を一定とすることができる。換言すると、ユーザーは表示部４０の輝度ムラを体感することがなくなる。また、表示装置に入力する階調データの変更による観察輝度の補正が不要となり、表示装置の階調表現能力を最大化することが可能となる。したがって、ユーザーエクスペリエンスが飛躍的に向上する。 Next, in S4, the backlight 50 emits light with the adjusted light quantity. Thereby, the observation luminance in the gaze area always becomes the visual luminance value. Such light amount adjustment processing is executed every time the gaze area moves. Thereby, even if a gaze area moves because a user's eyes | visual_axis moves, the observation brightness | luminance in a gaze area can be made constant. In other words, the user does not experience the luminance unevenness of the display unit 40. Further, it is not necessary to correct the observation luminance by changing the gradation data input to the display device, so that the gradation expression capability of the display device can be maximized. Therefore, the user experience is dramatically improved.
　続いて、階調補正部１０４による階調補正処理について説明する。Ｓ６において、階調補正部１０４は、注視エリアのムラ情報に基づいて、注視エリア以外の階調レベルを補正する。具体的には、階調補正部１０４は、注視エリアにおける階調補正値が０となるようにムラ情報を変更する。そして、全てのエリアにおけるムラ情報を変更することで、ムラテーブルＴ３を生成する。その後、補正された階調レベルを表すデータを表示部４０に出力する。また、他の観点では、階調補正部１０４は、注視エリアの階調分解能が他のエリアの階調分解能より高くなるように、他のエリアの階調レベルを補正する。 Subsequently, the tone correction processing by the tone correction unit 104 will be described. In S <b> 6, the gradation correction unit 104 corrects gradation levels other than the gaze area based on the unevenness information of the gaze area. Specifically, the gradation correction unit 104 changes the unevenness information so that the gradation correction value in the gaze area becomes zero. And the nonuniformity table T3 is produced | generated by changing the nonuniformity information in all the areas. Thereafter, data representing the corrected gradation level is output to the display unit 40. In another aspect, the gradation correction unit 104 corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area.
　そして、Ｓ７において、階調補正部１０４が、ムラテーブルＴ０から新たに生成されたムラテーブルＴ３を階調補正テーブル記憶部２０３に出力する。階調補正テーブル記憶部２０３は、かかるムラテーブルＴ３を記憶する。 In S7, the gradation correction unit 104 outputs the unevenness table T3 newly generated from the unevenness table T0 to the gradation correction table storage unit 203. The gradation correction table storage unit 203 stores the unevenness table T3.
　次に、Ｓ８において、表示部４０は、補正された階調レベルに基づいて画像を表示する。これにより、注視エリアにおける階調潰れをなくすことが可能となる。また、注視エリアを基準として他のエリアの階調レベルを補正する（換言すると、注視エリアの階調分解能が他のエリアの階調分解能より高くなるように、他のエリアの階調レベルを補正する）ことにより、表示部４０全体の輝度の均一性を向上させることができる。 Next, in S8, the display unit 40 displays an image based on the corrected gradation level. As a result, it is possible to eliminate gradation collapse in the gaze area. Also, the gradation level of the other area is corrected based on the gaze area (in other words, the gradation level of the other area is corrected so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area). By doing so, it is possible to improve the luminance uniformity of the entire display unit 40.
　制御装置１は、光量調整処理及び階調補正処理を、注視エリアが移動する度に実行する。 The control device 1 executes the light amount adjustment process and the gradation correction process every time the gaze area moves.
＜光量調整処理＞
　次に、光量調整部１０３による光量調整処理の詳細について、図４及び図５を用いて説明する。なお、本実施形態では、図４の各テーブルＴ０～Ｔ２における太枠で示されるエリア（１：１）が注視エリアを表す。 <Light intensity adjustment processing>
Next, details of the light amount adjustment processing by the light amount adjustment unit 103 will be described with reference to FIGS. 4 and 5. In the present embodiment, an area (1: 1) indicated by a thick frame in each of the tables T0 to T2 in FIG. 4 represents a gaze area.
　光量調整処理は、予め定められた階調値が入力されたときの注視エリアにおける観察輝度を一定に保つための処理である。なお、本実施形態では、任意の観察輝度を目標観察輝度とし、注視エリアが移動しても、注視エリアにおける観察輝度を目標観察輝度となるようにバックライト５０を調整する。これにより、注視エリアが移動しても、注視エリアの観察輝度が一定となる。 The light amount adjustment process is a process for keeping the observation luminance in the gaze area constant when a predetermined gradation value is input. In the present embodiment, an arbitrary observation luminance is set as the target observation luminance, and the backlight 50 is adjusted so that the observation luminance in the gaze area becomes the target observation luminance even when the gaze area moves. Thereby, even if a gaze area moves, the observation brightness | luminance of a gaze area becomes constant.
　ここで、目標観察輝度の定め方は特に限られず、例えば、バックライト５０による光量調整がない場合における中央エリア（３：３）の観察輝度を目標観察輝度としたり、ユーザーにより任意に設定される値を目標観察輝度としてもよい。なお、本実施形態では、バックライト５０による光量調整がない場合における、中央エリア（３：３）の観察輝度を目標観察輝度とした例について説明する。 Here, the method of determining the target observation brightness is not particularly limited. For example, the observation brightness in the central area (3: 3) when there is no light amount adjustment by the backlight 50 is set as the target observation brightness or is arbitrarily set by the user. The value may be the target observation luminance. In the present embodiment, an example will be described in which the observation luminance in the central area (3: 3) is set as the target observation luminance when there is no light amount adjustment by the backlight 50.
　上記内容について、具体例を用いて説明する。本実施形態に係る光量調整処理を実行していない場合において、例えば、バックライト５０の光量設定値（２５６階調とする）を１２８としたときに、バックライト５０の光量が６００ｃｄ／ｃｍ２であるとする。この光が液晶を通過するときに減衰されるので、観察輝度は、バックライト５０の光量よりも小さくなる。ここで、液晶の透過率は表示部４０の場所により異なる場合がある。例えば、液晶の表示階調値を２５５としたときの中央エリア（３：３）での透過率が５０％、注視エリア（１：１）での透過率が４０％である場合、中央エリア（３：３）の観察輝度は３００ｃｄ／ｃｍ２（＝６００×０．５）、注視エリア（１：１）の観察輝度は２４０ｃｄ／ｃｍ２（＝６００×０．４）となる。さらに、バックライト５０においても場所によって出力される光強度にばらつきがある。このように、注視エリア（１：１）と中央エリア（３：３）とで観察輝度が異なる結果となる場合がある。 The above contents will be described using a specific example. When the light amount adjustment processing according to the present embodiment is not executed, for example, when the light amount setting value of the backlight 50 (256 gradations) is 128, the light amount of the backlight 50 is 600 cd / cm 2 . Suppose there is. Since this light is attenuated when passing through the liquid crystal, the observation luminance is smaller than the light amount of the backlight 50. Here, the transmittance of the liquid crystal may vary depending on the location of the display unit 40. For example, when the liquid crystal display gradation value is 255 and the transmittance in the central area (3: 3) is 50% and the transmittance in the gaze area (1: 1) is 40%, the central area ( The observation luminance of 3: 3) is 300 cd / cm 2 (= 600 × 0.5), and the observation luminance of the gaze area (1: 1) is 240 cd / cm 2 (= 600 × 0.4). Further, the light intensity output from the backlight 50 varies depending on the location. As described above, the observation luminance may be different between the gaze area (1: 1) and the central area (3: 3).
　そこで、本実施形態に係る光量調整処理では、ユーザーが実際に視認している注視エリア（１：１）における観察輝度が、予め定められた目標監察輝度（中央エリア（３：３）の観察輝度である３００ｃｄ／ｃｍ２）となるようにバックライト５０の光量を調整することにより、ユーザーが感じる観察輝度を見かけ上一定に保つことが可能となる。 Therefore, in the light amount adjustment processing according to the present embodiment, the observation luminance in the gaze area (1: 1) that is actually visually recognized by the user is a predetermined target monitoring luminance (observation luminance in the central area (3: 3)). By adjusting the light quantity of the backlight 50 so as to be 300 cd / cm 2 ), the observation luminance felt by the user can be kept apparently constant.
　ここで、バックライト５０の光量がバックライト５０の光量設定値に比例するとみなすと、バックライト５０の光量設定値を１．２５倍（＝１２８×１．２５）に設定すると、バックライト５０の光量も１．２５倍（＝６００×１．２５）となる。このとき、注視エリア（１：１）の観察輝度は、３００ｃｄ／ｃｍ２（＝６００×１．２５×０．４）となる。 Here, assuming that the light amount of the backlight 50 is proportional to the light amount setting value of the backlight 50, when the light amount setting value of the backlight 50 is set to 1.25 times (= 128 × 1.25), The amount of light is also 1.25 times (= 600 × 1.25). At this time, the observation luminance in the gaze area (1: 1) is 300 cd / cm 2 (= 600 × 1.25 × 0.4).
　本実施形態では、注視エリアが移動する度に、バックライト５０の光量を再計算する。これにより、注視エリアにおける観察輝度が常に目標観察輝度と一致し、注視エリアにおける観察輝度が一定となる。以下、光量調整処理の各ステップについて説明する。 In the present embodiment, the amount of light of the backlight 50 is recalculated every time the gaze area moves. Thereby, the observation luminance in the gaze area always matches the target observation luminance, and the observation luminance in the gaze area becomes constant. Hereinafter, each step of the light amount adjustment process will be described.
　まず、Ｓ３１において、注視エリアを取得する。 First, in S31, a gaze area is acquired.
　次に、Ｓ３２において、ムラテーブル記憶部２０１からムラテーブルＴ０を取得する。つまり、光量調整部１０３は、表示部４０を複数のエリアに分割し、各エリアに割り当てられたムラテーブルＴ０を取得する取得部として機能する。そして、ムラテーブルＴ０を取得することで、ムラ情報を取得する。 Next, in S32, the unevenness table T0 is acquired from the unevenness table storage unit 201. That is, the light amount adjustment unit 103 functions as an acquisition unit that divides the display unit 40 into a plurality of areas and acquires the unevenness table T0 assigned to each area. The unevenness information is acquired by acquiring the unevenness table T0.
　次に、Ｓ３３において、各エリアと中央エリア（３：３）との輝度比に基づいて調整係数を計算し、光量調整テーブルＴ１を生成する。具体的には、ムラテーブルＴ０の各エリアについて、「中央エリアのムラ情報／各エリアのムラ情報」を計算し、光量調整テーブルＴ１を生成する。例えば、注視エリア（１：１）では、「１００／８０＝１．２５」となる。かかる値が、ムラ情報（ムラテーブルＴ０）に基づいて算出される調整係数となる。つまり、調整係数は、注視エリアのムラ情報を何倍すると、ムラテーブルＴ０における複数のエリアから予め定められたエリア（中央エリア（３：３））のムラ情報になるか、を表す係数である。換言すると、調整係数は、ムラ情報と注視エリアとの輝度比に基づいて算出される係数である。なお、本実施形態では、小数点第３位以降を切り捨てた値を図示している。 Next, in S33, an adjustment coefficient is calculated based on the luminance ratio between each area and the central area (3: 3) to generate a light amount adjustment table T1. Specifically, for each area of the unevenness table T0, “middle information of the central area / unevenness information of each area” is calculated, and the light amount adjustment table T1 is generated. For example, in the gaze area (1: 1), “100/80 = 1.25”. Such a value is an adjustment coefficient calculated based on the unevenness information (unevenness table T0). That is, the adjustment coefficient is a coefficient representing how many times the unevenness information of the gaze area becomes the unevenness information of a predetermined area (center area (3: 3)) from a plurality of areas in the unevenness table T0. . In other words, the adjustment coefficient is a coefficient calculated based on the luminance ratio between the unevenness information and the gaze area. In the present embodiment, a value obtained by rounding down the third decimal place is shown.
　次に、Ｓ３４において、目標観察輝度を取得する。ここで、本実施形態では、上述のとおり、目標観察輝度を「３００ｃｄ／ｃｍ２」とする。 Next, in S34, target observation brightness is acquired. Here, in the present embodiment, as described above, the target observation luminance is “300 cd / cm 2 ”.
　次に、Ｓ３５において、バックライト５０の光量設定値を計算する。具体的には、光量調整部１０３は、ムラ情報に基づいて算出される調整係数と、目標観察輝度とに基づいて、バックライト５０の光量を計算する。より詳細には、注視エリアについて、「調整係数（１．２５）×バックライト５０の光量設定値（１２８）＝１６０」となる。すなわち、表示部４０が本来有する輝度ムラ（ムラテーブルＴ０参照）を考慮し、中央エリア（３：３）に対して８０％でしか輝度が表示されない注視エリア（１：１）に対して、バックライト５０の光量設定値を「１６０」とすることで、外部から観察される観察輝度が結果的に「３００ｃｄ／ｃｍ２（＝２４０（輝度設定値１２８のときにおける観察輝度）×（１６０／１２８）」となるのである。 Next, in S35, the light amount setting value of the backlight 50 is calculated. Specifically, the light amount adjustment unit 103 calculates the light amount of the backlight 50 based on the adjustment coefficient calculated based on the unevenness information and the target observation luminance. More specifically, for the gaze area, “adjustment coefficient (1.25) × light amount setting value of backlight 50 (128) = 160”. That is, considering the luminance unevenness inherent in the display unit 40 (see the unevenness table T0), the back of the gaze area (1: 1) where the luminance is displayed only at 80% of the central area (3: 3). By setting the light intensity setting value of the light 50 to “160”, the observation luminance observed from the outside is “300 cd / cm 2 (= 240 (observation luminance when the luminance setting value 128)” × (160/128). ) ”.
　ここで、本実施形態では、バックライト５０は分割制御を実行せず、全体の光量をまとめて調整するものであるので、注視エリア（１：１）についてのバックライト５０の光量設定値が「１６０」となった場合には、バックライト５０全体として「１６０」の光量設定値で光を照射することになる。なお、図４では、テーブルＴ２における各エリアの調整後の光量設定値を図示しているが、実際には注視エリア（１：１）についてのみ計算すればよい。そして、かかる光量設定値を光量調整部１０３に出力する。 Here, in the present embodiment, the backlight 50 does not execute the division control and adjusts the entire light amount collectively, so the light amount setting value of the backlight 50 for the gaze area (1: 1) is “ In the case of “160”, the backlight 50 as a whole is irradiated with light at a light amount setting value of “160”. In FIG. 4, the light amount setting value after adjustment of each area in the table T <b> 2 is illustrated, but actually, only the gaze area (1: 1) needs to be calculated. Then, the light amount setting value is output to the light amount adjustment unit 103.
　次に、図５を用いて、光量調整処理が実行された結果、ユーザーによる注視エリアの見え方がどのように遷移するかについて説明する。図５（ａ）は注視エリアが（１：１）のとき、図５（ｂ）は注視エリアが（１：２）のときにおける各種テーブルＴ０～Ｔ２及び観察輝度を表す。ここで、図５（ａ）の場合における各エリアの観察輝度は、「６００×０．５×｛（Ｔ０におけるムラ情報）／１００｝×｛（Ｔ２におけるエリア（１：１）の光量設定値）／１２８｝で求めることができる。例えば、注視エリア（１：１）では、「３００ｃｄ／ｃｍ２（＝２４０（輝度設定値「１２８」のときにおける観察輝度であり、「＝６００×０．５×（８０／１００）」）×（１６０／１２８）」となる。 Next, how the appearance of the gaze area by the user transitions as a result of the light amount adjustment processing will be described with reference to FIG. FIG. 5A shows the various tables T0 to T2 and the observation luminance when the gaze area is (1: 1), and FIG. 5B shows the various tables T0 to T2 and the observation luminance when the gaze area is (1: 2). Here, the observation luminance of each area in the case of FIG. 5A is “600 × 0.5 × {(unevenness information at T0) / 100} × {(light intensity setting value of area (1: 1) at T2. ) / 128} For example, in the gaze area (1: 1), “300 cd / cm 2 (= 240 (brightness setting value“ 128 ”is the observation luminance, and“ = 600 × 0. 5 × (80/100) ”) × (160/128)”.
　図５（ｂ）に示されるように、注視エリアが（１：２）に移動すると、光量調整テーブルＴ１の値も図５（ａ）の状態から変化する。具体的には、「１００／７５＝１．３３３」となる。この結果、テーブルＴ２の値も変化する。具体的には、「調整係数（１．３３３）×目標観察輝度（１２８）＝１７１」となる。ここで、図５（ｂ）の場合における各エリアの観察輝度は、「６００×０．５×｛（Ｔ０におけるムラ情報）／１００｝×｛（Ｔ２におけるエリア（１：２）の光量設定値）／１２８｝で求めることができる。例えば、注視エリア（１：２）では、「３００ｃｄ／ｃｍ２（＝２２５（輝度設定値「１２８」のときにおける観察輝度であり、「＝６００×０．５×（７５／１００）」）×（１７１／１２８）」となる。 As shown in FIG. 5B, when the gaze area moves to (1: 2), the value of the light amount adjustment table T1 also changes from the state of FIG. Specifically, “100/75 = 1.333”. As a result, the value of the table T2 also changes. Specifically, “adjustment coefficient (1.333) × target observation luminance (128) = 171”. Here, the observation luminance of each area in the case of FIG. 5B is “600 × 0.5 × {(unevenness information at T0) / 100} × {(the light amount setting value of the area (1: 2) at T2). ) / 128} For example, in the gaze area (1: 2), “300 cd / cm 2 (= 225 (brightness setting value“ 128 ”is the observation luminance, and“ = 600 × 0. 5 * (75/100) ") * (171/128)".
　このように、注視エリアが移動すると、光量調整処理を実行し、注視エリアが移動しても、注視エリアにおける観察輝度が一定になるように表示装置を制御することが可能となる。これにより、光量調整部１０３は、注視エリアの移動に伴いバックライト５０の光量を調整し、注視エリアにおける外部から観察される観察輝度を一定にすることができる。 As described above, when the gaze area moves, the light amount adjustment process is executed, and even when the gaze area moves, the display device can be controlled so that the observation luminance in the gaze area becomes constant. Thereby, the light quantity adjustment part 103 can adjust the light quantity of the backlight 50 with the movement of a gaze area, and can make observation brightness observed from the outside in a gaze area constant.
＜階調補正処理＞
　次に、階調補正部１０４による階調補正処理の詳細について、図６を用いて説明する。 <Tone correction processing>
Next, details of the gradation correction processing by the gradation correction unit 104 will be described with reference to FIG.
　まず、Ｓ６１において、注視エリアを取得する。なお、本実施形態では、図６の各テーブルＴ０、Ｔ３～Ｔ７における太枠で示されるエリア（１：１）が注視エリアを表す。 First, in S61, a gaze area is acquired. In the present embodiment, an area (1: 1) indicated by a thick frame in each of the tables T0 and T3 to T7 in FIG. 6 represents a gaze area.
　次に、Ｓ６２において、ムラテーブル記憶部２０１からムラテーブルＴ０を取得する。つまり、階調補正部１０４は、表示部４０を複数のエリアに分割し、各エリアに割り当てられたムラテーブルＴ０を取得する取得部として機能する。そして、ムラテーブルＴ０を取得することで、ムラ情報を取得する。 Next, in S62, the unevenness table T0 is acquired from the unevenness table storage unit 201. That is, the gradation correction unit 104 functions as an acquisition unit that divides the display unit 40 into a plurality of areas and acquires the unevenness table T0 assigned to each area. The unevenness information is acquired by acquiring the unevenness table T0.
　次に、Ｓ６３において、ムラテーブルＴ０を再計算する。具体的には、注視エリア（１：１）の値が１となるように、他のエリアの値を変更する。例えば、注視エリア（１：１）では「８０／８０＝１」、中央エリア（３：３）では「８０／１００＝０．８」となる。これにより、注視エリア（１：１）における階調補正値が０となるように、ムラ情報を変更する。そして、全てのエリアにおけるムラ情報を変更することで、ムラテーブルＴ０から新たなムラテーブルＴ３が生成される。 Next, in S63, the unevenness table T0 is recalculated. Specifically, the values of the other areas are changed so that the value of the gaze area (1: 1) becomes 1. For example, “80/80 = 1” in the gaze area (1: 1), and “80/100 = 0.8” in the central area (3: 3). Accordingly, the unevenness information is changed so that the gradation correction value in the gaze area (1: 1) becomes zero. Then, by changing the unevenness information in all areas, a new unevenness table T3 is generated from the unevenness table T0.
　次に、Ｓ６４において、入力階調を取得する。ここで、入力階調は、表示部４０におけるエリア毎に異なる値である。本実施形態では、注視エリア（１：１）では、入力階調が１２８であり、中央エリア（３：３）では入力階調が２５５である。なお、かかる入力階調は、図示しない画像データ入力装置により制御装置１に入力される。かかるエリア毎の入力階調を表したものが、テーブルＴ４である。 Next, in S64, the input gradation is acquired. Here, the input gradation is a different value for each area in the display unit 40. In the present embodiment, the input gradation is 128 in the gaze area (1: 1), and the input gradation is 255 in the center area (3: 3). The input gradation is input to the control device 1 by an image data input device (not shown). A table T4 represents the input gradation for each area.
　次に、Ｓ６５において、各エリアと中央エリア（３：３）との輝度比を計算し、テーブルＴ５を生成する。ここで、かかる計算はγ補正に基づいてなされるものであり、本実施形態では、「γ＝２．２」として計算している。具体的には、注視エリア（１：１）においては、「｛（１２８／２５５）＾２．２｝×１＝０．２１９」となり、中央エリア（３：３）においては、「｛（２５５／２５５｝＾２．２）×０．８＝０．８」である。すなわち、かかる計算は、「入力階調（Ｔ４）を２５５で割ることにより規格化した値をγ乗し、かかる値にテーブルＴ３の値（補正係数）を乗算する」ものである。かかる計算は、公知のγ補正に相当する。これを各エリアについて実行し、テーブルＴ５を生成する。 Next, in S65, the luminance ratio between each area and the central area (3: 3) is calculated, and a table T5 is generated. Here, such calculation is performed based on γ correction, and in the present embodiment, calculation is performed with “γ = 2.2”. Specifically, in the gaze area (1: 1), “{(128/255) ^ 2.2} × 1 = 0.219”, and in the central area (3: 3), “{(255 /255}^2.2)×0.8=0.8 ”. That is, this calculation is “the value normalized by dividing the input gradation (T4) by 255 to the γ-th power, and this value is multiplied by the value (correction coefficient) in the table T3”. Such calculation corresponds to a known γ correction. This is executed for each area to generate a table T5.
　次に、Ｓ６６において、入力階調を再計算し、テーブルＴ６を生成する。これは、テーブル５に基づいて、入力階調を再計算するものである。具体的には、注視エリア（１：１）においては、「２５５×｛０．２１９＾（１／２．２）｝＝１２８」であり、中央エリア（３：３）においては、「２５５×｛０．８＾（１／２．２）｝＝２３０」である。ここで、本実施形態では、注視エリア（１：１）の値が１となるようにテーブルＴ３が生成されているので、Ｓ６６における処理の結果、注視エリア（１：１）に対応する入力階調値はＳ６４で取得された入力階調「１２８」のままとなる。一方、中央エリア（３：３）のように、テーブルＴ３において補正係数が１以外のエリアでは、Ｓ６４で取得された入力階調と、Ｓ６６で再計算された入力階調とが異なる。そして、各エリアについて計算された値を元に、新たなテーブルＴ６が生成される。つまり、階調補正処理では、注視エリア（１：１）を基準とし、他のエリアの階調を補正するものである。換言すると、階調補正部１０４は、注視エリアの階調分解能が他のエリアの階調分解能より高くなるように、他のエリアの階調レベルを補正する。 Next, in S66, the input gradation is recalculated to generate a table T6. This is to recalculate the input gradation based on the table 5. Specifically, in the gaze area (1: 1), “255 × {0.219 ^ (1 / 2.2)} = 128”, and in the central area (3: 3), “255 × {0.8 ^ (1 / 2.2)} = 230 ". Here, in the present embodiment, since the table T3 is generated so that the value of the gaze area (1: 1) is 1, the input floor corresponding to the gaze area (1: 1) as a result of the process in S66. The tone value remains the input tone “128” acquired in S64. On the other hand, in the area where the correction coefficient is not 1 in the table T3 as in the central area (3: 3), the input gradation acquired in S64 is different from the input gradation recalculated in S66. Then, a new table T6 is generated based on the values calculated for each area. That is, in the gradation correction process, the gradation of other areas is corrected based on the gaze area (1: 1). In other words, the gradation correction unit 104 corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area.
　次に、Ｓ６７において、出力階調を計算する。具体的には、Ｓ６６における計算の結果、エリア（５：１）、（５：４）では、階調が最大階調である２５５を超えている。しかし、実際にはかかる階調を出力することができないので、２５５を超えた階調を一律２５５と修正し、最終的な出力階調を表すテーブルＴ７を生成する。そして、かかる出力階調を表示部４０に出力する。 Next, in S67, the output gradation is calculated. Specifically, as a result of the calculation in S66, in areas (5: 1) and (5: 4), the gradation exceeds the maximum gradation of 255. However, since such gradation cannot actually be output, the gradation exceeding 255 is uniformly corrected to 255, and a table T7 representing the final output gradation is generated. Then, the output gradation is output to the display unit 40.
　このように、階調補正部１０４は、注視エリアのムラ情報に基づいて、他のエリアの階調レベルを補正する。ここで、本実施形態では、ムラ情報は、表示部４０を複数のエリアに分割し、各エリアに割り当てられた情報であり、ムラテーブルＴ０の一部である。また、ムラ情報は、各エリアの観察輝度と、予め定められたエリアの観察輝度との比率である。そして、Ｓ６３において、注視エリアにおける階調補正値が０となるように、ムラ情報（ムラテーブルＴ０）からムラテーブルＴ３を生成する。その後、Ｓ６４において、注視エリアの観察輝度と他のエリアの観察輝度とに基づいて、階調レベルの補正を実行する。しかし、ムラ情報は、これに限らず、エリア分割せず、単に表示部４０における観察輝度の分布であってもよい。また、他の観点では、階調補正部１０４は、注視エリアの階調分解能が他のエリアの階調分解能より高くなるように、他のエリアの階調レベルを補正する。 In this way, the gradation correction unit 104 corrects the gradation levels of other areas based on the unevenness information of the gaze area. Here, in the present embodiment, the unevenness information is information assigned to each area by dividing the display unit 40 into a plurality of areas, and is a part of the unevenness table T0. The unevenness information is a ratio between the observation luminance of each area and the observation luminance of a predetermined area. In S63, the unevenness table T3 is generated from the unevenness information (unevenness table T0) so that the gradation correction value in the gaze area becomes 0. Thereafter, in S64, the gradation level is corrected based on the observation luminance of the gaze area and the observation luminance of other areas. However, the unevenness information is not limited to this, and may be an observation luminance distribution on the display unit 40 without being divided into areas. In another aspect, the gradation correction unit 104 corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area.
　つまり、従来の階調補正のように、ムラテーブルＴ０における最低値に合わせて他のエリアの階調レベルを補正するのではなく、注視エリアを基準として他のエリアの階調レベルを補正することにより、注視エリアにおける階調潰れをなくすことができる。この結果、ユーザーにとっては、注視エリアの階調表現性が最大限発揮されることになるので、視認性が向上する。 That is, instead of correcting the gradation level of the other area according to the lowest value in the unevenness table T0 as in the conventional gradation correction, the gradation level of the other area is corrected based on the gaze area. Therefore, it is possible to eliminate gradation collapse in the gaze area. As a result, the gradation expression of the gaze area is maximized for the user, so that the visibility is improved.
　そして、注視エリアが移動すると、階調補正処理を実行し、注視エリアを基準として他のエリアの階調が補正されるので、表示部４０全体の輝度の均一性を向上させることができる。 Then, when the gaze area moves, gradation correction processing is executed, and the gradation of other areas is corrected based on the gaze area, so that the uniformity of the brightness of the entire display unit 40 can be improved.
　以上、種々の実施形態について説明したが、本発明はこれらに限定されない。 Although various embodiments have been described above, the present invention is not limited to these.
　制御装置１は、ＰＣ、クラウドコンピューティング、コンピュータに接続するセットトップボックスとして提供することができる。また、制御装置１の機能を実装したＡＳＩＣ（ａｐｐｌｉｃａｔｉｏｎ　ｓｐｅｃｉｆｉｃ　ｉｎｔｅｇｒａｔｅｄ　ｃｉｒｃｕｉｔ）、ＦＰＧＡ（ｆｉｅｌｄ－ｐｒｏｇｒａｍｍａｂｌｅ　ｇａｔｅ　ａｒｒａｙ）、ＤＲＰ（ｄｙｎａｍｉｃ　ｒｅｃｏｎｆｉｇｕｒａｂｌｅ　ｐｒｏｃｅｓｓｏｒ）として提供することもできる。つまり、制御装置１の機能を実装した、コンピュータ読み取り可能な非一時的な記録媒体として提供することもできる。また、制御装置１の機能を実現するプログラムをインターネット等を介して配信することもできる。 The control device 1 can be provided as a set top box connected to a PC, cloud computing, or computer. In addition, an ASIC (application specific integrated circuit), an FPGA (field-programmable gate array), or a DRP (dynamic reconfigurable processor) that implements the function of the control device 1 is also provided. That is, it can also be provided as a computer-readable non-transitory recording medium that implements the function of the control device 1. In addition, a program for realizing the function of the control device 1 can be distributed via the Internet or the like.
　また、制御装置１を表示装置と別体として設ける場合には、表示部４０及びバックライト５０は制御装置１に含まれない。さらに、処理部１０と記憶部２０を別の装置として実現し、それぞれの装置が通信可能に接続される構成としてもよい。 Further, when the control device 1 is provided separately from the display device, the display unit 40 and the backlight 50 are not included in the control device 1. Furthermore, it is good also as a structure which implement | achieves the process part 10 and the memory | storage part 20 as another apparatus, and each apparatus is connected so that communication is possible.
　また、テーブルＴ０に代えて、ムラ情報として所定の関数で表される情報を利用してもよい。この場合、光量調整処理及び階調補正処理において、ユーザーの視線の位置を表す座標データに対応するムラ量を用いてもよく、注視エリアに含まれるムラ量の平均値を用いてもよい。 Further, instead of the table T0, information represented by a predetermined function may be used as unevenness information. In this case, in the light amount adjustment process and the gradation correction process, the amount of unevenness corresponding to the coordinate data representing the position of the user's line of sight may be used, or the average value of the amount of unevenness included in the gaze area may be used.
　また、ユーザーが複数存在する場合、つまり、複数のユーザーにより表示装置が利用されている場合には、特定のユーザーの視線の位置を表す座標データのみを利用して注視エリアを決定してもよい。さらに、複数のユーザーの視線を表す座標データに基づいて注視エリアを決定してもよい。例えば、各ユーザーの視線の位置を表す座標データの平均値を求め、かかる座標データにより注視エリアを決定してもよい。 Further, when there are a plurality of users, that is, when a display device is used by a plurality of users, the gaze area may be determined using only coordinate data representing the position of the line of sight of a specific user. . Furthermore, the gaze area may be determined based on coordinate data representing the line of sight of a plurality of users. For example, an average value of coordinate data representing the position of the line of sight of each user may be obtained, and the gaze area may be determined based on the coordinate data.
　また、バックライト５０を分割制御可能な表示装置に対して本発明を適用してもよい。この場合、さらに精密な輝度調整が可能となる。 Further, the present invention may be applied to a display device that can control the backlight 50 in a divided manner. In this case, more precise brightness adjustment is possible.
１：制御装置
１０：処理部
２０：記憶部
３０：操作部
４０：表示部
５０：バックライト
６０：通信部
１００：バス
１０１：視線検出部
１０２：注視エリア決定部
１０３：光量調整部
１０４：階調補正部
２０１：ムラテーブル記憶部
２０２：光量調整テーブル記憶部
２０３：階調補正テーブル記憶部 1: control device 10: processing unit 20: storage unit 30: operation unit 40: display unit 50: backlight 60: communication unit 100: bus 101: gaze detection unit 102: gaze area determination unit 103: light amount adjustment unit 104: floor Tone correction unit 201: Unevenness table storage unit 202: Light amount adjustment table storage unit 203: Tone correction table storage unit

Claims (13)

  1. 　表示装置のバックライトの光量を調整する光量調整部と、
    　前記表示装置の表示部におけるユーザーの注視エリアを決定する注視エリア決定部と、
    　を備え、
    　前記光量調整部は、前記注視エリアに予め定められた階調値が入力されたときの前記注視エリアにおける外部から観察される観察輝度が一定となるように、前記注視エリアの移動に伴って前記バックライトの光量を調整するように構成される、
    　制御装置。     A light amount adjustment unit for adjusting the light amount of the backlight of the display device;
    A gaze area determination unit that determines a user's gaze area in the display unit of the display device;
    With
    The light amount adjustment unit is configured to move the gaze area in accordance with the movement of the gaze area so that the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input to the gaze area is constant. Configured to adjust the amount of backlight light,
    Control device.
  2. 　前記光量調整部は、前記注視エリアが移動したときに前記バックライトの光量を再調整する、請求項１に記載の制御装置。 The control device according to claim 1, wherein the light amount adjustment unit readjusts the light amount of the backlight when the gaze area moves.
  3. 　前記光量調整部は、前記表示部のムラ情報に基づいて、前記注視エリアに予め定められた階調値が入力されたときに、外部から観察される観察輝度が予め定められた目標観察輝度となるように前記バックライトの光量を調整する、請求項１又は請求項２に記載の制御装置。 The light amount adjustment unit is configured to set a predetermined observation luminance to be observed from the outside when a predetermined gradation value is input to the gaze area based on unevenness information of the display unit. The control device according to claim 1, wherein the light amount of the backlight is adjusted so as to be.
  4. 　前記光量調整部は、前記ムラ情報に基づいて算出される調整係数と前記目標観察輝度とに基づいて、前記バックライトの光量を調整する、請求項３に記載の制御装置。 The control device according to claim 3, wherein the light amount adjustment unit adjusts the light amount of the backlight based on an adjustment coefficient calculated based on the unevenness information and the target observation luminance.
  5. 　前記調整係数は、前記ムラ情報と前記注視エリアとの輝度比である、請求項４に記載の制御装置。 The control device according to claim 4, wherein the adjustment coefficient is a luminance ratio between the unevenness information and the gaze area.
  6. 　前記表示装置に入力される入力画像データの階調レベルを補正する階調補正部を備え、
    　前記階調補正部は、前記注視エリアのムラ情報に基づいて他のエリアの階調レベルを補正する、請求項３～請求項５のいずれか１項に記載の制御装置。     A gradation correction unit for correcting a gradation level of input image data input to the display device;
    6. The control device according to claim 3, wherein the gradation correction unit corrects the gradation level of another area based on unevenness information of the gaze area.
  7. 　前記表示装置に入力される入力画像データの階調レベルを補正する階調補正部を備え、
    　前記階調補正部は、前記注視エリアの階調分解能が他のエリアの階調分解能より高くなるように前記他のエリアの階調レベルを補正する、請求項３～請求項５のいずれか１項に記載の制御装置。     A gradation correction unit for correcting a gradation level of input image data input to the display device;
    6. The gradation correction unit according to claim 3, wherein the gradation correction unit corrects the gradation level of the other area so that the gradation resolution of the gaze area is higher than the gradation resolution of the other area. The control device according to item.
  8. 　前記ムラ情報を取得する取得部を備え、
    　前記階調補正部は、前記注視エリアにおける階調補正値が０となるように前記ムラ情報を変更する、請求項６又は請求項７に記載の制御装置。     An acquisition unit for acquiring the unevenness information;
    The control device according to claim 6 or 7, wherein the gradation correction unit changes the unevenness information so that a gradation correction value in the gaze area becomes zero.
  9. 　前記階調補正部は、前記注視エリアが移動したときに前記階調レベルの補正を実行する、請求項６～請求項８のいずれか１項に記載の制御装置。 The control device according to any one of claims 6 to 8, wherein the gradation correction unit executes the correction of the gradation level when the gaze area moves.
  10. 　前記階調補正部は、前記注視エリアの観察輝度と他のエリアの観察輝度とに基づいて、前記階調レベルの補正を実行する、請求項６～請求項９のいずれか１項に記載の制御装置。 10. The gradation correction unit according to claim 6, wherein the gradation correction unit performs the correction of the gradation level based on the observation luminance of the gaze area and the observation luminance of another area. Control device.
  11. 　前記ムラ情報は、前記表示部における観察輝度の分布である、請求項３～請求項１０のいずれか１項に記載の制御装置。 The control device according to any one of claims 3 to 10, wherein the unevenness information is a distribution of observation luminance in the display unit.
  12. 　前記注視エリア決定部は、ユーザーの視線の位置を表す座標データに基づいて、前記注視エリアを決定する、請求項１～請求項１１のいずれか１項に記載の制御装置。 12. The control device according to claim 1, wherein the gaze area determination unit determines the gaze area based on coordinate data representing a position of a user's line of sight.
  13. 　コンピュータを、
    　表示装置のバックライトの光量を調整する光量調整部、
    　前記表示装置の表示部におけるユーザーの注視エリアを決定する注視エリア決定部、
    　として機能させ、
    　前記光量調整部は、前記注視エリアに予め定められた階調値が入力されたときの前記注視エリアにおける外部から観察される観察輝度が一定となるように、前記注視エリアの移動に伴って前記バックライトの光量を調整するように構成される、
    　制御プログラム。     Computer
    A light amount adjustment unit for adjusting the light amount of the backlight of the display device;
    A gaze area determining unit that determines a user's gaze area in the display unit of the display device;
    Function as
    The light amount adjustment unit is configured to move the gaze area in accordance with the movement of the gaze area so that the observation luminance observed from the outside in the gaze area when a predetermined gradation value is input to the gaze area is constant. Configured to adjust the amount of backlight light,
    Control program.
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CN113314063B (en) * 2021-05-31 2023-08-08 北京京东方光电科技有限公司 Display panel driving method and device and display equipment

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