WO2014097447A1 - Display apparatus, and method for correcting luminance unevenness of display apparatus - Google Patents

Display apparatus, and method for correcting luminance unevenness of display apparatus Download PDF

Info

Publication number
WO2014097447A1
WO2014097447A1 PCT/JP2012/083065 JP2012083065W WO2014097447A1 WO 2014097447 A1 WO2014097447 A1 WO 2014097447A1 JP 2012083065 W JP2012083065 W JP 2012083065W WO 2014097447 A1 WO2014097447 A1 WO 2014097447A1
Authority
WO
WIPO (PCT)
Prior art keywords
backlight
light amount
unit
blocks
block
Prior art date
Application number
PCT/JP2012/083065
Other languages
French (fr)
Japanese (ja)
Inventor
勝之 松井
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｎｅｃディスプレイソリューションズ株式会社 filed Critical Ｎｅｃディスプレイソリューションズ株式会社
Priority to PCT/JP2012/083065 priority Critical patent/WO2014097447A1/en
Publication of WO2014097447A1 publication Critical patent/WO2014097447A1/en

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • the present invention relates to a technique for correcting luminance unevenness on a display screen of a display device.
  • Image display devices such as liquid crystal display devices are widely used.
  • luminance unevenness correction of a screen is performed.
  • a method of correcting the luminance unevenness there is a method of correcting the luminance unevenness by correcting the video signal input to the display device (for example, see Patent Document 1).
  • the luminance unevenness changes with long-term use of the display device, but the problem is that the built-in sensors of the display device cannot directly detect the change in luminance unevenness of the screen.
  • the conventional technique for realizing luminance unevenness correction by correcting a video signal requires a high amount of backlight. That is, since it is necessary to reduce the level of the video signal in the high luminance area in accordance with the low luminance area, a sufficient amount of backlight is required.
  • the luminance unevenness correction also causes problems such as an increase in power consumption, an increase in heat generation, and a decrease in contrast ratio and gradation reproducibility that serve as an index of image quality.
  • the present invention has been made in order to solve the above-described problem, and an object of the present invention is to provide a light amount of a backlight based on a predetermined reference value when a variation in luminance unevenness occurs due to backlight deterioration or the like in a display device. It is an object of the present invention to provide a technique for adjusting luminance unevenness by adjusting.
  • the present invention includes a backlight unit having a backlight divided into a plurality of blocks, and a backlight light amount detection unit that detects and outputs the light amount of the backlight divided into the plurality of blocks. And a backlight that calculates a light amount ratio based on the light amount of the backlight of each block input from the backlight light amount detection unit, and calculates a backlight drive amount of each block based on the calculated light amount ratio A control unit; and a backlight driving unit that drives the backlight divided into the plurality of blocks according to the backlight driving amount calculated by the backlight control unit.
  • the light amount ratio of the backlight of each block adjusted to minimize the luminance unevenness in the display unit is set as a reference light amount ratio, and Based on the light quantity ratio between the reference light quantity ratio is a display device for adjusting the light quantity of the backlight of each block.
  • the present invention relates to a backlight light amount detection step for detecting and outputting the light amount of each backlight divided into a plurality of blocks of the display unit, and the backlight light amount of each block output in the backlight detection step.
  • a first backlight control step that calculates a light amount ratio based on the calculated light amount ratio and calculates a backlight drive amount of the backlight of each block based on the calculated light amount ratio; and the backlight calculated in the first backlight control step
  • the backlight driving step for driving the backlight of each block according to the driving amount, and the light amount ratio of the backlight of each block adjusted in advance so as to minimize the luminance unevenness in the display unit as the reference light amount ratio, the calculation The backlight intensity of each block is adjusted based on the measured light intensity ratio and the reference light intensity ratio.
  • a second backlight control step that is the luminance nonuniformity correction method of a display device having a.
  • the driving amount of the backlight is adjusted based on the light amount of the backlight when the luminance unevenness is adjusted in advance to be the minimum.
  • luminance unevenness can be corrected.
  • the luminance unevenness can be corrected with a low backlight driving amount, thereby suppressing the power consumption of the display device that performs the luminance unevenness correction, It is possible to suppress heat generation, improve the luminance life (improve the backlight life), and improve the contrast ratio that is an index of image quality.
  • FIG. 5 is a flowchart for explaining a luminance unevenness initial correction process of the display device in the embodiment. It is a flowchart for demonstrating the brightness nonuniformity recorrection process of the display apparatus in the embodiment. It is the figure which showed schematic structure of the display apparatus which concerns on the 2nd Embodiment of this invention. 5 is a flowchart for explaining a luminance unevenness initial correction process of the display device in the embodiment. It is a flowchart for demonstrating the brightness nonuniformity recorrection process of the display apparatus in the embodiment.
  • FIG. 1 is a block diagram showing an embodiment of a display device according to the present invention.
  • the display device 1 includes a display unit 2, a BL light amount detection unit 3, a backlight (hereinafter referred to as BL) unit 4, a BL control unit 5, and a BL drive unit 6.
  • the display unit 2 is, for example, an image display unit of a liquid crystal display device, and includes a BL light amount detection unit 3 and a backlight unit 4.
  • the BL light amount detection unit 3 detects the light amount of the backlight unit 4 for each backlight.
  • a white LED Light Emitting Diode
  • the display unit 2 includes a backlight divided into a plurality of blocks.
  • the block is divided into three blocks: a left backlight block, a center backlight block, and a right backlight block.
  • the BL control unit 5 performs a control calculation based on the BL light amount received from the BL light amount detection unit 3. Further, the BL control unit 5 transmits a control signal for driving the backlight unit 4 to the BL drive unit 6.
  • the BL drive unit 6 drives the backlight unit 4 for each block based on the control signal received from the BL control unit 5.
  • FIG. 2 is a diagram showing a schematic configuration of the display device 10 according to the first embodiment of the present invention.
  • the display device 10 receives the video signal from the video signal output device 18 at the input unit 20.
  • the video signal is processed by the control calculation unit 19 and then displayed on the display unit 12.
  • the display device 10 includes a display unit 12, a BL light amount detection unit 13, a backlight unit 14, a BL drive unit 16, a storage unit 17, a control calculation unit 19, and an input unit 20.
  • the input unit 20 receives a video signal necessary for video display from a video signal output device 18 such as a PC or a video.
  • the input unit 20 includes an input interface such as a push button, and a setting value is input from the user by a setting program using, for example, an OSD (On Screen Display).
  • the display unit 12 displays images, characters, an application software operation screen, and the like.
  • the display unit 12 includes a BL light quantity detection unit 13 and a backlight unit 14.
  • the BL light quantity detection unit 13 is provided, for example, at the rear end (left side in FIG. 2) of the display unit 12, and indirectly detects the light transmitted through the diffusion plate, the light guide plate, etc. Detect the amount of light.
  • the light amount of the backlight unit 14 is detected and output to the BL control unit 15 for each backlight block.
  • the backlight unit 14 uses, for example, a white LED as a light emitter, and emits light based on a drive signal from the BL drive unit 16.
  • the display unit 12 includes a backlight unit 14 divided into a plurality of blocks.
  • the backlight unit 14 is provided at the end of the display unit (lower part in FIGS. 1 and 2), and forms a uniform surface light source by a plate-like optical member such as a diffusion plate, a light guide plate, or a reflection plate (not shown).
  • the backlight unit 14 is divided into three blocks of a left BL 14a, a center BL 14b, and a right BL 14c.
  • the left BL 14a, the center BL 14b, and the right BL 14c are referred to as backlight blocks 14a to 14c.
  • Each of the backlight blocks 14a to 14c has a plurality of white LEDs.
  • the control calculation unit 19 performs control calculation including image processing and luminance unevenness correction processing, and controls each unit other than the control calculation unit 19.
  • the control calculation unit 19 includes a BL control unit 15.
  • the BL control unit 15 performs a control calculation based on the light amounts of the backlight blocks 14a to 14c input from the BL light amount detection unit 13, and stores data necessary for luminance unevenness correction processing in the storage unit 17.
  • the BL control unit 15 outputs a control signal for causing the BL drive unit 16 to drive the backlight unit 14.
  • the BL drive unit 16 includes a left BL drive unit 16a, a center BL drive unit 16b, and a right BL drive unit 16c for each of the backlight blocks 14a to 14c.
  • the BL drive unit 16 outputs a drive signal to the backlight unit 14 based on the control signal input from the BL control unit 15, and causes the backlight blocks 14a to 14c to emit light.
  • the storage unit 17 stores various programs executed by the control calculation unit 19 and data used in control and calculation.
  • the storage unit 17 stores, for example, a program including a luminance unevenness correction program, a setting program using OSD (On Screen Display), and the like.
  • the storage unit 17 includes a reference light amount ratio storage unit 17a and a BL drive amount storage unit 17b.
  • the reference light amount ratio storage unit 17a expresses the light amount value of each of the backlight blocks 14a to 14c calculated by the BL control unit 15 as a ratio, and stores the ratio as a reference light amount ratio.
  • the ratio is based on the left BL as a reference (1.0).
  • (Left BL: Center BL: Right BL) (1.0: 0.7: 0.4).
  • the BL light amount detection unit 13 is installed at the left end of the back surface of the display unit 12, and the detected light amount varies depending on the distance from each of the backlight blocks 14a to 14c.
  • the reference light amount ratio is a value that is used as a reference in the luminance unevenness correction process.
  • the BL drive amount storage unit 17b stores the BL drive amount calculated by the BL control unit 15.
  • the luminance unevenness correction processing of the display device 10 in the present embodiment is roughly divided into the following two steps.
  • First, the luminance unevenness initial correction process that is performed first is the first step, and the luminance unevenness recorrection process that is performed when the luminance unevenness changes due to deterioration of the backlight blocks 14a to 14c due to the use of the display device 10 or the like.
  • This is the second step.
  • the two processes will be described in order below.
  • the first step of the two processes is to determine the drive amount of the backlight blocks 14a to 14c in the state where the luminance unevenness of the display device 10 is corrected.
  • the first step is performed when the device is assembled.
  • the luminance unevenness initial correction process is not limited to when the apparatus is assembled, and may be performed at the start of use of the apparatus, for example.
  • FIG. 3 is a flowchart for explaining the luminance unevenness initial correction process of the display device 10 according to the embodiment.
  • the brightness of the display screen of the display device 10 is measured at a plurality of measurement locations (for example, three locations of left, center, and right) using an external optical sensor that is not included in the display device 10 when the device is assembled (step S101).
  • the BL drive amount for each of the backlight blocks 14a to 14c is determined so as to minimize the luminance unevenness of the screen, that is, the luminance deviation of each measurement place measured in step S101 (step S102).
  • the BL control unit 15 stores the determined BL drive amount for each of the backlight blocks 14a to 14c in the BL drive amount storage unit 17b (step S103).
  • the BL control unit 15 lights each of the backlight blocks 14a to 14c one block at a time with the determined BL driving amount, and the BL light amount detection unit 13 detects the light amount value of each of the backlight blocks 14a to 14c (step S104). .
  • the BL control unit 15 calculates the ratio of the light amount values of the detected backlight blocks 14a to 14c (step S105).
  • the BL control unit 15 stores the calculated light amount value ratio in the reference light amount ratio storage unit 17a (step S106), and ends the process.
  • FIG. 4 is a flowchart for explaining luminance unevenness re-correction processing of the display device according to the embodiment.
  • the BL control unit 15 once turns off all the backlight blocks 14a to 14c, then turns on the backlight blocks 14a to 14c one by one in sequence, and the BL light amount detection unit 13 detects the light amount value for each backlight block. (Step S201).
  • the BL control unit 15 calculates the ratio of the light amount value for each of the backlight blocks 14a to 14c (step S203).
  • the BL control unit 15 reads the ratio of the light amount value for each of the backlight blocks 14a to 14c stored in the luminance unevenness initial correction process by the reference light amount ratio storage unit 17a (step S204).
  • the BL control unit 15 determines whether or not the ratio of the light quantity value for each of the backlight blocks 14a to 14c stored in the initial correction process is the same as the ratio of the light quantity value for each of the backlight blocks 14a to 14c calculated in the process of step S203. Is determined (step S206).
  • the BL control unit 15 stores the ratio of the light amount value for each of the backlight blocks 14a to 14c calculated in the process of step S203, which is stored in the reference light amount ratio storage unit 17a in the luminance unevenness initial correction process.
  • the BL drive amount for each of the backlight blocks 14a to 14c is adjusted so as to be the same as the ratio of the light amount value for each of the blocks 14a to 14c (step S207).
  • the BL control unit 15 stores the BL drive amount adjusted in the process of Step S207 in the BL drive amount storage unit 17b (Step S208), and ends the process.
  • the ratio of the light amount value for each of the backlight blocks 14a to 14c stored in the luminance unevenness initial correction process is the same as the ratio of the light amount value for each of the backlight blocks 14a to 14c calculated in the process of step S203. (Step S206: YES), the process ends.
  • FIG. 5 is a diagram showing a schematic configuration of a display device 30 according to the second embodiment of the present invention.
  • the display device 30 receives the video signal from the video signal output device 18 at the input unit 40.
  • the video signal is processed by the control calculation unit 39 and then displayed on the display unit 32.
  • the display device 30 includes a display unit 32, a BL light amount detection unit 33, a backlight unit 34, a BL drive unit 36, a storage unit 37, a control calculation unit 39, and an input unit 40.
  • the description of the components having the same functions as those of the display device 10 according to the first embodiment will be omitted, and components having different functions will be described.
  • the BL light amount detection unit 33 detects the light amount of the backlight unit 34 for each backlight block and outputs it to the BL control unit 15.
  • an RGB-LED color sensor is used as the detection element.
  • the RGB-LED color sensor detects the amount of light from the RGB-LED, which is a light-emitting body composed of LEDs of three colors: RED (red), GREEN (green), and BLUE (blue), and detects the amount of light for each RGB color. can do.
  • the three colors RED (red), GREEN (green), and BLUE (blue) are referred to as RGB.
  • the backlight unit 34 uses, for example, RGB-LEDs and emits light based on the drive signal from the BL drive unit 16.
  • the RGB-LED that is a light emitter can be driven for each color of RGB.
  • the backlight unit 34 is divided into three blocks of a left BL 34a, a center BL 34b, and a right BL 34c.
  • the left BL 34a, the center BL 34b, and the right BL 34c are referred to as backlight blocks 34a to 34c.
  • Each of the backlight blocks 34a to 34c has a plurality of RGB-LEDs.
  • the BL control unit 35 performs control calculation based on the light amounts of the RGB colors of the backlight blocks 34 a to 34 c input from the BL light amount detection unit 33, and stores data necessary for luminance unevenness correction processing in the storage unit 37. Let The BL control unit 35 outputs a control signal for causing the BL drive unit 36 to drive the backlight unit 34.
  • the BL drive unit 36 includes a left BL drive unit 36a, a center BL drive unit 36b, and a right BL drive unit 36c for each of the backlight blocks 34a to 34c.
  • the BL drive unit 36 outputs a drive signal to the backlight unit 34 based on the control signal input from the BL control unit 35, and causes the backlight blocks 34a to 34c to emit light.
  • the BL drive unit 36 drives each of the backlight blocks 34a to 34c for each of three colors of RED (red), GREEN (green), and BLUE (blue).
  • the backlight unit 34 is divided into three blocks of a left BL 14a, a center BL 14b, and a right BL 14c.
  • FIG. 6 is a flowchart for explaining the luminance unevenness initial correction process of the display device 30 in the embodiment.
  • an external optical sensor not included in the display device 30 is used at the time of assembling the device, and the luminance of the display screen of the display device 30 is changed to RGB colors at a plurality of measurement locations (for example, three locations of left, center, and right). Measurement is performed every time (step S301).
  • the BL driving amount for each of the backlight blocks 34a to 34c is determined for each of the RGB colors so that the luminance unevenness of the screen, that is, the luminance deviation at each measurement location measured in step S101 is minimized (step S302). ).
  • the BL control unit 35 causes the BL drive amount storage unit 37b to store the BL drive amount for each of the determined backlight blocks 34a to 34c and RGB colors (step S303).
  • the BL control unit 35 lights each of the backlight blocks 34a to 34c one block at a time with the determined BL driving amount for each RGB color, and the BL light amount detection unit 33 sets the light amount value of each of the backlight blocks 34a to 34c. Detection is performed for each of the RGB colors (step S304).
  • the BL control unit 35 calculates the ratio of the light amount values of the detected backlight blocks 34a to 34c for each RGB color (step S305).
  • the BL control unit 35 stores the calculated light amount value ratio in the reference light amount ratio storage unit 37a (step S306), and ends the process.
  • FIG. 7 is a flowchart for explaining luminance unevenness re-correction processing of the display device 30 in the embodiment.
  • the BL control unit 35 once turns off all the backlight blocks 34a to 34c, and then turns on the backlight blocks 34a to 34c one by one in order, and causes the BL light amount detection unit 33 to change the light amount value for each backlight block to RGB. For each color (step S401).
  • the BL control unit 35 calculates the ratio of the light amount value for each of the backlight blocks 34a to 34c for each RGB color (step S403).
  • the BL control unit 35 reads the ratio of the light amount value for each of the backlight blocks 34a to 34c stored in the luminance unevenness initial correction process by the reference light amount ratio storage unit 37a (step S404).
  • the BL control unit 35 repeats the processing from step S406 to step S408 for each RGB color (step S405).
  • the BL control unit 35 determines whether or not the ratio of the light quantity value for each of the backlight blocks 34a to 34c stored in the initial correction process is the same as the ratio of the light quantity value for each of the backlight blocks 34a to 34c calculated in the process of step S403. Is determined (step S406).
  • the BL control unit 35 stores the ratio of the light amount value for each of the backlight blocks 34a to 34c calculated in the process of step S403, which is stored in the reference light amount ratio storage unit 37a in the luminance unevenness initial correction process.
  • the BL drive amount for each of the backlight blocks 34a to 34c is adjusted so as to be the same as the ratio of the light amount value for each of the blocks 34a to 34c (step S407).
  • the BL control unit 35 stores the BL drive amount adjusted in the process of Step S407 in the BL drive amount storage unit 37b (Step S408).
  • the BL control unit 35 ends the process when the process of steps S406 to S408 is repeated for each color of RGB in the process of step S405.
  • the backlight blocks 14a to 14c when the brightness unevenness is adjusted in advance to be minimized can be used to adjust the drive amounts of the backlight blocks 14a to 14c and 34a to 34c to correct the luminance unevenness.
  • the luminance unevenness correction method of the display device 10 has a lower backlight driving amount than the conventional method of correcting the luminance unevenness by correcting the video signal, which requires a higher backlight light amount. Because unevenness correction can be performed, power consumption of display devices that perform brightness unevenness correction, suppression of heat generation, improvement of luminance life (improvement of backlight life), and improvement of contrast ratio and gradation reproducibility as an index of image quality Can be achieved.
  • the light emitters of the backlight units 14 and 34 are LEDs.
  • the present invention is not limited to this example.
  • the light emitters of the backlight units 14 and 34 are cold cathode fluorescent tubes (CCFLs). Cold Cathode Fluorescent Lamp) or organic EL (Electro-Luminescence) may be used.
  • the display unit 12 includes the backlight units 14 and 34 that are divided into the left backlight blocks 14a and 34a, the central backlight blocks 14b and 34b, and the right backlight blocks 14c and 34c.
  • the backlight units 14, 34 may be divided into five blocks.
  • the backlight light quantity detection units 13 and 33 are installed on the back surface, but may be disposed on the front surface. Further, an external luminance sensor or the like that detects the light amount of the backlight units 14 and 34 may be connected to the display devices 10 and 30.
  • the backlight light quantity detection units 13 and 33 are installed at the left end of the back surface, but they may be installed on the left and right. When installed on the left and right, the detection accuracy increases particularly when the areas of the display units 12 and 32 are large.
  • luminance non-uniformity correction is performed by recording a program for realizing the functions of the display device described above on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium. Processing may be performed.
  • the “computer system” includes an OS and hardware such as peripheral devices.
  • the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
  • the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system.
  • the “computer-readable recording medium” includes a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client.
  • the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
  • the program may be stored in a predetermined server, and the program may be distributed (downloaded or the like) via a communication line in response to a request from another device.

Abstract

A display apparatus (1) is provided with: a display unit (2), which has a backlight unit (4) having a backlight divided into a plurality of blocks, and a backlight light quantity detecting unit (3) that detects and outputs light quantities of the backlight divided into the blocks; a backlight control unit (5), which calculates light quantity ratios on the basis of the backlight light quantities of respective blocks, said light quantities having been inputted from the backlight light quantity detecting unit (3), and which calculates backlight drive quantities of the backlight of respective blocks on the basis of the light quantity ratios thus calculated; and a backlight drive unit (6) that drives, corresponding to the backlight drive quantities thus calculated by means of the backlight control unit (5), the backlight divided into the blocks. The backlight control unit (5) sets, as reference light quantity ratios, the backlight light quantity ratios of the respective blocks, said light quantity ratios having been adjusted such that luminance unevenness is minimum in the display unit (2), and on the basis of the light quantity ratios and the reference light quantity ratios thus calculated, the backlight control unit adjusts the backlight light quantities of respective blocks.

Description

表示装置及び表示装置における輝度ムラ補正方法Display device and luminance unevenness correction method in display device
　本発明は、表示装置の表示画面における輝度ムラを補正する技術に関する。 The present invention relates to a technique for correcting luminance unevenness on a display screen of a display device.
　液晶表示装置などの画像表示装置は広く使用されている。なかでも高度な表示性能が求められる医療用・デザイン用画像表示装置では、画面の輝度ムラ補正が行われている。
　輝度ムラを補正する方法には、表示装置に入力される映像信号を補正することで輝度ムラの補正をする方法がある（例えば、特許文献１参照）。 Image display devices such as liquid crystal display devices are widely used. In particular, in a medical / design image display device that requires high display performance, luminance unevenness correction of a screen is performed.
As a method of correcting the luminance unevenness, there is a method of correcting the luminance unevenness by correcting the video signal input to the display device (for example, see Patent Document 1).
特開２０１２－１４１６２６号公報JP 2012-141626 A
　しかしながら、良好な輝度ムラ特性はバックライトの劣化により長期間は維持できないという問題がある。具体的には、輝度ムラは表示装置の長期使用に伴い変化するが、表示装置の内蔵センサ類では画面の輝度ムラの変化を直接検出できないという問題である。
　また、輝度ムラ補正を映像信号の補正で実現する従来の技術では、高いバックライト光量を必要とする。すなわち、輝度の低い領域に合わせて輝度の高い領域の映像信号のレベルを低下させる必要があるため、十分なバックライト光量が必要となる。輝度ムラ補正により、消費電力の増加、発熱の増加、及び画質の指標となるコントラスト比の低下や階調再現性の低下という問題も生じる。 However, there is a problem that good luminance unevenness characteristics cannot be maintained for a long time due to deterioration of the backlight. Specifically, the luminance unevenness changes with long-term use of the display device, but the problem is that the built-in sensors of the display device cannot directly detect the change in luminance unevenness of the screen.
In addition, the conventional technique for realizing luminance unevenness correction by correcting a video signal requires a high amount of backlight. That is, since it is necessary to reduce the level of the video signal in the high luminance area in accordance with the low luminance area, a sufficient amount of backlight is required. The luminance unevenness correction also causes problems such as an increase in power consumption, an increase in heat generation, and a decrease in contrast ratio and gradation reproducibility that serve as an index of image quality.
　本発明は、上記問題を解決すべくなされたもので、その目的は、表示装置においてバックライトの劣化等により輝度ムラの変化が生じた際に、予め定めた基準値に基づいてバックライトの光量を調整することにより輝度ムラを調整する技術を提供することにある。 The present invention has been made in order to solve the above-described problem, and an object of the present invention is to provide a light amount of a backlight based on a predetermined reference value when a variation in luminance unevenness occurs due to backlight deterioration or the like in a display device. It is an object of the present invention to provide a technique for adjusting luminance unevenness by adjusting.
　上記問題を解決するために、本発明は、複数のブロックに分割されたバックライトを有するバックライト部と該複数のブロックに分割されたバックライトの光量を検出し出力するバックライト光量検出部とを有する表示部と、前記バックライト光量検出部から入力された各ブロックのバックライトの光量に基づき光量比を算出し、算出した光量比に基づいて各ブロックのバックライト駆動量を算出するバックライト制御部と、前記バックライト制御部が算出した前記バックライト駆動量に応じて前記複数のブロックに分割されたバックライトを駆動するバックライト駆動部と、を備え、前記バックライト制御部は、予め前記表示部における輝度ムラが最小となるよう調整された各ブロックのバックライトの光量比を基準光量比とし、前記算出した光量比と前記基準光量比に基づいて各ブロックのバックライトの光量を調整する表示装置である。 In order to solve the above problem, the present invention includes a backlight unit having a backlight divided into a plurality of blocks, and a backlight light amount detection unit that detects and outputs the light amount of the backlight divided into the plurality of blocks. And a backlight that calculates a light amount ratio based on the light amount of the backlight of each block input from the backlight light amount detection unit, and calculates a backlight drive amount of each block based on the calculated light amount ratio A control unit; and a backlight driving unit that drives the backlight divided into the plurality of blocks according to the backlight driving amount calculated by the backlight control unit. The light amount ratio of the backlight of each block adjusted to minimize the luminance unevenness in the display unit is set as a reference light amount ratio, and Based on the light quantity ratio between the reference light quantity ratio is a display device for adjusting the light quantity of the backlight of each block.
　また、本発明は、表示部の複数のブロックに分割されたバックライトそれぞれの光量を検出し出力するバックライト光量検出ステップと、前記バックライト検出ステップにおいて出力された各ブロックのバックライトの光量に基づき光量比を算出し、算出した光量比に基づいて各ブロックのバックライトのバックライト駆動量を算出する第一のバックライト制御ステップと、前記第一のバックライト制御ステップにおいて算出されたバックライト駆動量に応じて各ブロックのバックライトを駆動するバックライト駆動ステップと、予め前記表示部における輝度ムラが最小となるよう調整された各ブロックのバックライトの光量比を基準光量比とし、前記算出した光量比と前記基準光量比に基づいて、各ブロックのバックライトの光量を調整する第二のバックライト制御ステップと、を有する表示装置の輝度ムラ補正方法である。 Further, the present invention relates to a backlight light amount detection step for detecting and outputting the light amount of each backlight divided into a plurality of blocks of the display unit, and the backlight light amount of each block output in the backlight detection step. A first backlight control step that calculates a light amount ratio based on the calculated light amount ratio and calculates a backlight drive amount of the backlight of each block based on the calculated light amount ratio; and the backlight calculated in the first backlight control step The backlight driving step for driving the backlight of each block according to the driving amount, and the light amount ratio of the backlight of each block adjusted in advance so as to minimize the luminance unevenness in the display unit as the reference light amount ratio, the calculation The backlight intensity of each block is adjusted based on the measured light intensity ratio and the reference light intensity ratio. A second backlight control step that is the luminance nonuniformity correction method of a display device having a.
　この発明によれば、表示装置において表示部の輝度ムラに変化が生じた場合、輝度ムラが最小となるよう予め調整されたときのバックライトの光量に基づいてバックライトの駆動量を調整することにより輝度ムラを補正することができる。
　また、従来の映像信号を補正する方法では高いバックライト光量が必要とされるのに比べ、低いバックライト駆動量で輝度ムラ補正ができるため、輝度ムラ補正を行う表示装置の消費電力の抑制、発熱の抑制、輝度寿命の改善（バックライト寿命の改善）、及び画質の指標となるコントラスト比の改善を図ることができる。 According to the present invention, when a change occurs in the luminance unevenness of the display unit in the display device, the driving amount of the backlight is adjusted based on the light amount of the backlight when the luminance unevenness is adjusted in advance to be the minimum. Thus, luminance unevenness can be corrected.
In addition, compared to the conventional method of correcting the video signal, which requires a high amount of backlight, the luminance unevenness can be corrected with a low backlight driving amount, thereby suppressing the power consumption of the display device that performs the luminance unevenness correction, It is possible to suppress heat generation, improve the luminance life (improve the backlight life), and improve the contrast ratio that is an index of image quality.
本発明における表示装置の一実施態様を示す図である。It is a figure which shows one embodiment of the display apparatus in this invention. 本発明の第１の実施形態に係る表示装置の概略構成を示した図である。It is the figure which showed schematic structure of the display apparatus which concerns on the 1st Embodiment of this invention. 同実施形態における表示装置の輝度ムラ初期補正処理を説明するためのフローチャートである。5 is a flowchart for explaining a luminance unevenness initial correction process of the display device in the embodiment. 同実施形態における表示装置の輝度ムラ再補正処理を説明するためのフローチャートである。It is a flowchart for demonstrating the brightness nonuniformity recorrection process of the display apparatus in the embodiment. 本発明の第２の実施形態に係る表示装置の概略構成を示した図である。It is the figure which showed schematic structure of the display apparatus which concerns on the 2nd Embodiment of this invention. 同実施形態における表示装置の輝度ムラ初期補正処理を説明するためのフローチャートである。5 is a flowchart for explaining a luminance unevenness initial correction process of the display device in the embodiment. 同実施形態における表示装置の輝度ムラ再補正処理を説明するためのフローチャートである。It is a flowchart for demonstrating the brightness nonuniformity recorrection process of the display apparatus in the embodiment.
　本発明を実施するための態様について、図１を参照して説明する。
　図１は、本発明における表示装置の一実施態様を示すブロック図である。
　表示装置１は、表示部２、ＢＬ光量検出部３、バックライト（以下、ＢＬとする）部４、ＢＬ制御部５、及びＢＬ駆動部６を備える。
　表示部２は、例えば液晶表示装置の画像表示部であり、ＢＬ光量検出部３、及びバックライト部４を備える。ＢＬ光量検出部３は、バックライト毎にバックライト部４の光量を検出する。バックライト部４は、例えば、白色ＬＥＤ（Light Emitting Diode）が使用され、本実施態様では複数のブロックに分割されたバックライトが表示部２に備えられる。ここでは、一例として、左バックライトブロックと中央バックライトブロックと右バックライトブロックとの３つのブロックに分かれている。ＢＬ制御部５は、ＢＬ光量検出部３から受けたＢＬ光量に基づいて制御演算を行う。また、ＢＬ制御部５は、バックライト部４を駆動させるための制御信号をＢＬ駆動部６に送信する。ＢＬ駆動部６は、ＢＬ制御部５から受信した制御信号に基づきバックライト部４をブロック毎に駆動する。 An embodiment for carrying out the present invention will be described with reference to FIG.
FIG. 1 is a block diagram showing an embodiment of a display device according to the present invention.
The display device 1 includes a display unit 2, a BL light amount detection unit 3, a backlight (hereinafter referred to as BL) unit 4, a BL control unit 5, and a BL drive unit 6.
The display unit 2 is, for example, an image display unit of a liquid crystal display device, and includes a BL light amount detection unit 3 and a backlight unit 4. The BL light amount detection unit 3 detects the light amount of the backlight unit 4 for each backlight. For example, a white LED (Light Emitting Diode) is used as the backlight unit 4. In the present embodiment, the display unit 2 includes a backlight divided into a plurality of blocks. Here, as an example, the block is divided into three blocks: a left backlight block, a center backlight block, and a right backlight block. The BL control unit 5 performs a control calculation based on the BL light amount received from the BL light amount detection unit 3. Further, the BL control unit 5 transmits a control signal for driving the backlight unit 4 to the BL drive unit 6. The BL drive unit 6 drives the backlight unit 4 for each block based on the control signal received from the BL control unit 5.
　以下、本発明を実施するための形態について、図面を参照して説明する。
　図２は、本発明の第１の実施形態に係る表示装置１０の概略構成を示した図である。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 2 is a diagram showing a schematic configuration of the display device 10 according to the first embodiment of the present invention.
　表示装置１０は、映像信号出力装置１８からの映像信号を入力部２０で受信する。その映像信号は、制御演算部１９で処理された後、表示部１２で映像が表示される。
　表示装置１０は、表示部１２、ＢＬ光量検出部１３、バックライト部１４、ＢＬ駆動部１６、記憶部１７、制御演算部１９、及び入力部２０を備える。
　入力部２０は、ＰＣやビデオ等の映像信号出力装置１８から映像表示に必要な映像信号が入力される。また、入力部２０は、押ボタンなどの入力インタフェースを備え、例えばＯＳＤ（Ｏｎ　Ｓｃｒｅｅｎ　Ｄｉｓｐｌａｙ）による設定プログラムによりユーザから設定値が入力される。 The display device 10 receives the video signal from the video signal output device 18 at the input unit 20. The video signal is processed by the control calculation unit 19 and then displayed on the display unit 12.
The display device 10 includes a display unit 12, a BL light amount detection unit 13, a backlight unit 14, a BL drive unit 16, a storage unit 17, a control calculation unit 19, and an input unit 20.
The input unit 20 receives a video signal necessary for video display from a video signal output device 18 such as a PC or a video. The input unit 20 includes an input interface such as a push button, and a setting value is input from the user by a setting program using, for example, an OSD (On Screen Display).
　表示部１２は、画像や文字、及びアプリケーションソフトウェア操作画面などを表示する。また、表示部１２は、ＢＬ光量検出部１３とバックライト部１４とを備える。
　ＢＬ光量検出部１３は、例えば表示部１２の背面の端部（図２では左側）に設けられており、拡散板や導光板等を透過した光を検出することによって、間接的にバックライトの光量を検出する。本実施形態では、バックライトブロック毎にバックライト部１４の光量を検出しＢＬ制御部１５に出力する。 The display unit 12 displays images, characters, an application software operation screen, and the like. The display unit 12 includes a BL light quantity detection unit 13 and a backlight unit 14.
The BL light quantity detection unit 13 is provided, for example, at the rear end (left side in FIG. 2) of the display unit 12, and indirectly detects the light transmitted through the diffusion plate, the light guide plate, etc. Detect the amount of light. In the present embodiment, the light amount of the backlight unit 14 is detected and output to the BL control unit 15 for each backlight block.
　バックライト部１４は、例えば、発光体として白色ＬＥＤが使用され、ＢＬ駆動部１６からの駆動信号に基づき発光する。本実施形態では、複数のブロックに分割されたバックライト部１４が表示部１２に備えられる。バックライト部１４は、表示部の端部（図１、図２では下部）に備えられ、図示しない拡散板、導光板や反射板等の板状の光学部材により均一な面光源を構成する。バックライト部１４は、ここでは、左ＢＬ１４ａと中央ＢＬ１４ｂと及び右ＢＬ１４ｃとの３つのブロックに分割されている。以下、左ＢＬ１４ａ、中央ＢＬ１４ｂ、右ＢＬ１４ｃをバックライトブロック１４ａ～１４ｃと称する。バックライトブロック１４ａ～１４ｃは、それぞれ複数の白色ＬＥＤを有している。 The backlight unit 14 uses, for example, a white LED as a light emitter, and emits light based on a drive signal from the BL drive unit 16. In the present embodiment, the display unit 12 includes a backlight unit 14 divided into a plurality of blocks. The backlight unit 14 is provided at the end of the display unit (lower part in FIGS. 1 and 2), and forms a uniform surface light source by a plate-like optical member such as a diffusion plate, a light guide plate, or a reflection plate (not shown). Here, the backlight unit 14 is divided into three blocks of a left BL 14a, a center BL 14b, and a right BL 14c. Hereinafter, the left BL 14a, the center BL 14b, and the right BL 14c are referred to as backlight blocks 14a to 14c. Each of the backlight blocks 14a to 14c has a plurality of white LEDs.
　なお、本実施形態では、表示部１２の端部にバックライト部１４が備えられる例を用いて説明するが、表示部１２の下面部にバックライト部１４が備えられていてもよい。 In addition, although this embodiment demonstrates using the example in which the backlight part 14 is provided in the edge part of the display part 12, the backlight part 14 may be provided in the lower surface part of the display part 12. FIG.
　制御演算部１９は、画像処理、輝度ムラ補正処理を含む制御演算を行い、制御演算部１９を除く各部を制御する。制御演算部１９は、ＢＬ制御部１５を含む。
　ＢＬ制御部１５は、ＢＬ光量検出部１３から入力されたバックライトブロック１４ａ～１４ｃの光量に基づいて制御演算を行い、輝度ムラ補正処理に必要なデータを記憶部１７に記憶させる。また、ＢＬ制御部１５は、ＢＬ駆動部１６にバックライト部１４を駆動させるための制御信号を出力する。 The control calculation unit 19 performs control calculation including image processing and luminance unevenness correction processing, and controls each unit other than the control calculation unit 19. The control calculation unit 19 includes a BL control unit 15.
The BL control unit 15 performs a control calculation based on the light amounts of the backlight blocks 14a to 14c input from the BL light amount detection unit 13, and stores data necessary for luminance unevenness correction processing in the storage unit 17. The BL control unit 15 outputs a control signal for causing the BL drive unit 16 to drive the backlight unit 14.
　ＢＬ駆動部１６は、バックライトブロック１４ａ～１４ｃそれぞれに対し左ＢＬ駆動部１６ａ、中央ＢＬ駆動部１６ｂ、右ＢＬ駆動部１６ｃを備える。ＢＬ駆動部１６は、ＢＬ制御部１５から入力された制御信号に基づき駆動信号をバックライト部１４に出力し、バックライトブロック１４ａ～１４ｃを発光させる。 The BL drive unit 16 includes a left BL drive unit 16a, a center BL drive unit 16b, and a right BL drive unit 16c for each of the backlight blocks 14a to 14c. The BL drive unit 16 outputs a drive signal to the backlight unit 14 based on the control signal input from the BL control unit 15, and causes the backlight blocks 14a to 14c to emit light.
　記憶部１７は、制御演算部１９によって実行される各種プログラムや制御及び演算で使用されるデータを記憶する。記憶部１７は、例えば、輝度ムラ補正プログラム、ＯＳＤ（Ｏｎ　Ｓｃｒｅｅｎ　Ｄｉｓｐｌａｙ）による設定プログラム等を含むプログラムを記憶する。
　また、記憶部１７は、基準光量比記憶部１７ａと、ＢＬ駆動量記憶部１７ｂとを含む。基準光量比記憶部１７ａは、ＢＬ制御部１５が算出する各バックライトブロック１４ａ～１４ｃの光量値を比率で表し、該比率を基準光量比として記憶する。例えば、各バックライトブロック１４ａ～１４ｃの光量値が、（左ＢＬ：中央ＢＬ：右ＢＬ）＝（２００：１４０：８０）の場合、その比率は、左ＢＬを基準（１．０）とすると（左ＢＬ：中央ＢＬ：右ＢＬ）＝（１．０：０．７：０．４）と表される。本実施形態では、ＢＬ光量検出部１３は、表示部１２の背面の左端部に設置されており、各バックライトブロック１４ａ～１４ｃからの距離に応じて、検出した光量は異なる値となる。基準光量比は、輝度ムラ補正処理の際に基準とされる値である。ＢＬ駆動量記憶部１７ｂは、ＢＬ制御部１５が算出するＢＬ駆動量を記憶する。 The storage unit 17 stores various programs executed by the control calculation unit 19 and data used in control and calculation. The storage unit 17 stores, for example, a program including a luminance unevenness correction program, a setting program using OSD (On Screen Display), and the like.
The storage unit 17 includes a reference light amount ratio storage unit 17a and a BL drive amount storage unit 17b. The reference light amount ratio storage unit 17a expresses the light amount value of each of the backlight blocks 14a to 14c calculated by the BL control unit 15 as a ratio, and stores the ratio as a reference light amount ratio. For example, when the light quantity value of each of the backlight blocks 14a to 14c is (left BL: center BL: right BL) = (200: 140: 80), the ratio is based on the left BL as a reference (1.0). (Left BL: Center BL: Right BL) = (1.0: 0.7: 0.4). In the present embodiment, the BL light amount detection unit 13 is installed at the left end of the back surface of the display unit 12, and the detected light amount varies depending on the distance from each of the backlight blocks 14a to 14c. The reference light amount ratio is a value that is used as a reference in the luminance unevenness correction process. The BL drive amount storage unit 17b stores the BL drive amount calculated by the BL control unit 15.
　本実施形態における表示装置１０の輝度ムラ補正処理は、大きく次の２つのステップに分けられる。まず、最初に行われる輝度ムラ初期補正処理を第一のステップとし、表示装置１０の使用によるバックライトブロック１４ａ～１４ｃの劣化等により輝度ムラが変化した際に行われる輝度ムラ再補正処理を第二のステップとする。以下に順に２つの処理を説明する。
　なお、２つの処理のうち第一のステップは、表示装置１０の輝度ムラが補正された状態におけるバックライトブロック１４ａ～１４ｃの駆動量を決定するのが目的であり、例えば装置組立時に実施される。しかし、輝度ムラ初期補正処理は装置組立時に限らず、例えば装置の使用開始時に実施してもよい。 The luminance unevenness correction processing of the display device 10 in the present embodiment is roughly divided into the following two steps. First, the luminance unevenness initial correction process that is performed first is the first step, and the luminance unevenness recorrection process that is performed when the luminance unevenness changes due to deterioration of the backlight blocks 14a to 14c due to the use of the display device 10 or the like. This is the second step. The two processes will be described in order below.
The first step of the two processes is to determine the drive amount of the backlight blocks 14a to 14c in the state where the luminance unevenness of the display device 10 is corrected. For example, the first step is performed when the device is assembled. . However, the luminance unevenness initial correction process is not limited to when the apparatus is assembled, and may be performed at the start of use of the apparatus, for example.
　図３は、同実施形態における表示装置１０の輝度ムラ初期補正処理を説明するためのフローチャートである。
　まず、装置組立時に表示装置１０に含まれない外部の光学センサを用い、表示装置１０の表示画面の輝度を複数の測定箇所（例えば左と中央と右との３箇所）において測定する（ステップＳ１０１）。
　次いで、画面の輝度ムラ、すなわちステップＳ１０１で測定した各測定場所の輝度の偏差が最小となるように各バックライトブロック１４ａ～１４ｃ毎のＢＬ駆動量を決定する（ステップＳ１０２）。 FIG. 3 is a flowchart for explaining the luminance unevenness initial correction process of the display device 10 according to the embodiment.
First, the brightness of the display screen of the display device 10 is measured at a plurality of measurement locations (for example, three locations of left, center, and right) using an external optical sensor that is not included in the display device 10 when the device is assembled (step S101). ).
Next, the BL drive amount for each of the backlight blocks 14a to 14c is determined so as to minimize the luminance unevenness of the screen, that is, the luminance deviation of each measurement place measured in step S101 (step S102).
　ＢＬ制御部１５は、決定されたバックライトブロック１４ａ～１４ｃ毎のＢＬ駆動量をＢＬ駆動量記憶部１７ｂに記憶させる（ステップＳ１０３）。
　ＢＬ制御部１５は、決定されたＢＬ駆動量で各バックライトブロック１４ａ～１４ｃを１ブロックずつ点灯させ、ＢＬ光量検出部１３が各バックライトブロック１４ａ～１４ｃの光量値を検出する（ステップＳ１０４）。
　ＢＬ制御部１５は、検出された各バックライトブロック１４ａ～１４ｃの光量値の比率を算出する（ステップＳ１０５）。
　ＢＬ制御部１５は、算出した光量値の比率を基準光量比記憶部１７ａに記憶させ（ステップＳ１０６）、処理を終了する。 The BL control unit 15 stores the determined BL drive amount for each of the backlight blocks 14a to 14c in the BL drive amount storage unit 17b (step S103).
The BL control unit 15 lights each of the backlight blocks 14a to 14c one block at a time with the determined BL driving amount, and the BL light amount detection unit 13 detects the light amount value of each of the backlight blocks 14a to 14c (step S104). .
The BL control unit 15 calculates the ratio of the light amount values of the detected backlight blocks 14a to 14c (step S105).
The BL control unit 15 stores the calculated light amount value ratio in the reference light amount ratio storage unit 17a (step S106), and ends the process.
　図４は、同実施形態における表示装置の輝度ムラ再補正処理を説明するためのフローチャートである。
　ＢＬ制御部１５は、バックライトブロック１４ａ～１４ｃを一旦全て消灯させた後に、各バックライトブロック１４ａ～１４ｃを順次１ブロックずつ点灯させ、ＢＬ光量検出部１３にバックライトブロック毎の光量値を検出させる（ステップＳ２０１）。
　ＢＬ制御部１５は、バックライトブロック１４ａ～１４ｃ毎の光量値の比率を算出する（ステップＳ２０３）。
　ＢＬ制御部１５は、基準光量比記憶部１７ａが輝度ムラ初期補正処理において記憶したバックライトブロック１４ａ～１４ｃ毎の光量値の比率を読み出す（ステップＳ２０４）。
　ＢＬ制御部１５は、初期補正処理で記憶したバックライトブロック１４ａ～１４ｃ毎の光量値の比率とステップＳ２０３の処理において算出したバックライトブロック１４ａ～１４ｃ毎の光量値の比率とが同じか否かを判定する（ステップＳ２０６）。 FIG. 4 is a flowchart for explaining luminance unevenness re-correction processing of the display device according to the embodiment.
The BL control unit 15 once turns off all the backlight blocks 14a to 14c, then turns on the backlight blocks 14a to 14c one by one in sequence, and the BL light amount detection unit 13 detects the light amount value for each backlight block. (Step S201).
The BL control unit 15 calculates the ratio of the light amount value for each of the backlight blocks 14a to 14c (step S203).
The BL control unit 15 reads the ratio of the light amount value for each of the backlight blocks 14a to 14c stored in the luminance unevenness initial correction process by the reference light amount ratio storage unit 17a (step S204).
The BL control unit 15 determines whether or not the ratio of the light quantity value for each of the backlight blocks 14a to 14c stored in the initial correction process is the same as the ratio of the light quantity value for each of the backlight blocks 14a to 14c calculated in the process of step S203. Is determined (step S206).
　輝度ムラ初期補正処理で基準光量比記憶部１７ａが記憶したバックライトブロック１４ａ～１４ｃ毎の光量値の比率と輝度ムラ再補正処理で算出したバックライトブロック毎の光量値の比率とが異なる場合（ステップＳ２０６：ＮＯ）、ＢＬ制御部１５は、ステップＳ２０３の処理において算出したバックライトブロック１４ａ～１４ｃ毎の光量値の比率を、輝度ムラ初期補正処理において基準光量比記憶部１７ａが記憶したバックライトブロック１４ａ～１４ｃ毎の光量値の比率と同じになるようバックライトブロック１４ａ～１４ｃ毎のＢＬ駆動量を調整する（ステップＳ２０７）。 When the ratio of the light quantity value for each of the backlight blocks 14a to 14c stored in the reference light quantity ratio storage unit 17a in the brightness unevenness initial correction process is different from the ratio of the light quantity value for each backlight block calculated in the brightness unevenness recorrection process ( In step S206: NO), the BL control unit 15 stores the ratio of the light amount value for each of the backlight blocks 14a to 14c calculated in the process of step S203, which is stored in the reference light amount ratio storage unit 17a in the luminance unevenness initial correction process. The BL drive amount for each of the backlight blocks 14a to 14c is adjusted so as to be the same as the ratio of the light amount value for each of the blocks 14a to 14c (step S207).
　ＢＬ制御部１５は、ステップＳ２０７の処理において調整されたＢＬ駆動量をＢＬ駆動量記憶部１７ｂに記憶し（ステップＳ２０８）、処理を終了する。
　ステップＳ２０６の処理において、輝度ムラ初期補正処理で記憶したバックライトブロック１４ａ～１４ｃ毎の光量値の比率とステップＳ２０３の処理において算出したバックライトブロック１４ａ～１４ｃ毎の光量値の比率とが同じ場合（ステップＳ２０６：ＹＥＳ）、処理を終了する。 The BL control unit 15 stores the BL drive amount adjusted in the process of Step S207 in the BL drive amount storage unit 17b (Step S208), and ends the process.
In the process of step S206, the ratio of the light amount value for each of the backlight blocks 14a to 14c stored in the luminance unevenness initial correction process is the same as the ratio of the light amount value for each of the backlight blocks 14a to 14c calculated in the process of step S203. (Step S206: YES), the process ends.
　図５は、本発明の第２の実施形態に係る表示装置３０の概略構成を示した図である。
　表示装置３０は、映像信号出力装置１８からの映像信号を入力部４０で受信する。その映像信号は、制御演算部３９で処理された後、表示部３２で映像が表示される。
　表示装置３０は、表示部３２、ＢＬ光量検出部３３、バックライト部３４、ＢＬ駆動部３６、記憶部３７、制御演算部３９、及び入力部４０を備える。
　ここでは、第１の実施形態に係る表示装置１０と同様の機能を備える構成部については説明を省略し、機能が異なる構成部について説明する。 FIG. 5 is a diagram showing a schematic configuration of a display device 30 according to the second embodiment of the present invention.
The display device 30 receives the video signal from the video signal output device 18 at the input unit 40. The video signal is processed by the control calculation unit 39 and then displayed on the display unit 32.
The display device 30 includes a display unit 32, a BL light amount detection unit 33, a backlight unit 34, a BL drive unit 36, a storage unit 37, a control calculation unit 39, and an input unit 40.
Here, the description of the components having the same functions as those of the display device 10 according to the first embodiment will be omitted, and components having different functions will be described.
　ＢＬ光量検出部３３は、第２の実施形態では、バックライトブロック毎にバックライト部３４の光量を検出しＢＬ制御部１５に出力する。検出素子として、例えば、ＲＧＢ－ＬＥＤ用カラーセンサが使用される。ＲＧＢ－ＬＥＤ用カラーセンサは、ＲＥＤ（赤）、ＧＲＥＥＮ（緑）、ＢＬＵＥ（青）の３色のＬＥＤで構成される発光体であるＲＧＢ－ＬＥＤの光量を、ＲＧＢの色毎に光量を検出することができる。以下、ＲＥＤ（赤）、ＧＲＥＥＮ（緑）、ＢＬＵＥ（青）の３色をＲＧＢと称する。 In the second embodiment, the BL light amount detection unit 33 detects the light amount of the backlight unit 34 for each backlight block and outputs it to the BL control unit 15. For example, an RGB-LED color sensor is used as the detection element. The RGB-LED color sensor detects the amount of light from the RGB-LED, which is a light-emitting body composed of LEDs of three colors: RED (red), GREEN (green), and BLUE (blue), and detects the amount of light for each RGB color. can do. Hereinafter, the three colors RED (red), GREEN (green), and BLUE (blue) are referred to as RGB.
　バックライト部３４は、例えば、ＲＧＢ－ＬＥＤが使用され、ＢＬ駆動部１６からの駆動信号に基づき発光する。発光体であるＲＧＢ－ＬＥＤは、ＲＧＢの色毎に駆動させることができる。
　バックライト部３４は、ここでは、左ＢＬ３４ａと中央ＢＬ３４ｂと及び右ＢＬ３４ｃとの３つのブロックに分割されている。以下、左ＢＬ３４ａ、中央ＢＬ３４ｂ、右ＢＬ３４ｃをバックライトブロック３４ａ～３４ｃと称する。バックライトブロック３４ａ～３４ｃは、それぞれ複数のＲＧＢ－ＬＥＤを有している。 The backlight unit 34 uses, for example, RGB-LEDs and emits light based on the drive signal from the BL drive unit 16. The RGB-LED that is a light emitter can be driven for each color of RGB.
Here, the backlight unit 34 is divided into three blocks of a left BL 34a, a center BL 34b, and a right BL 34c. Hereinafter, the left BL 34a, the center BL 34b, and the right BL 34c are referred to as backlight blocks 34a to 34c. Each of the backlight blocks 34a to 34c has a plurality of RGB-LEDs.
　ＢＬ制御部３５は、ＢＬ光量検出部３３から入力されたバックライトブロック３４ａ～３４ｃのＲＧＢの色毎の光量に基づいて制御演算を行い、輝度ムラ補正処理に必要なデータを記憶部３７に記憶させる。また、ＢＬ制御部３５は、ＢＬ駆動部３６にバックライト部３４を駆動させるための制御信号を出力する。 The BL control unit 35 performs control calculation based on the light amounts of the RGB colors of the backlight blocks 34 a to 34 c input from the BL light amount detection unit 33, and stores data necessary for luminance unevenness correction processing in the storage unit 37. Let The BL control unit 35 outputs a control signal for causing the BL drive unit 36 to drive the backlight unit 34.
　ＢＬ駆動部３６は、バックライトブロック３４ａ～３４ｃそれぞれに対し左ＢＬ駆動部３６ａ、中央ＢＬ駆動部３６ｂ、右ＢＬ駆動部３６ｃを備える。ＢＬ駆動部３６は、ＢＬ制御部３５から入力された制御信号に基づき駆動信号をバックライト部３４に出力し、バックライトブロック３４ａ～３４ｃを発光させる。
　ここで、ＢＬ駆動部３６は、バックライトブロック３４ａ～３４ｃ毎に、ＲＥＤ（赤）、ＧＲＥＥＮ（緑）、ＢＬＵＥ（青）の３色の色毎に駆動させる。ここで、この例では、バックライト部３４は、左ＢＬ１４ａと中央ＢＬ１４ｂと及び右ＢＬ１４ｃとの３つのブロックに分割されている。 The BL drive unit 36 includes a left BL drive unit 36a, a center BL drive unit 36b, and a right BL drive unit 36c for each of the backlight blocks 34a to 34c. The BL drive unit 36 outputs a drive signal to the backlight unit 34 based on the control signal input from the BL control unit 35, and causes the backlight blocks 34a to 34c to emit light.
Here, the BL drive unit 36 drives each of the backlight blocks 34a to 34c for each of three colors of RED (red), GREEN (green), and BLUE (blue). Here, in this example, the backlight unit 34 is divided into three blocks of a left BL 14a, a center BL 14b, and a right BL 14c.
　図６は、同実施形態における表示装置３０の輝度ムラ初期補正処理を説明するためのフローチャートである。
　まず、装置組立時において表示装置３０に含まれない外部の光学センサを用い、表示装置３０の表示画面の輝度を複数の測定箇所（例えば左と中央と右との３箇所）において、ＲＧＢの色毎に測定する（ステップＳ３０１）。
　次いで、画面の輝度ムラ、すなわちステップＳ１０１で測定した各測定場所の輝度の偏差が最小となるように各バックライトブロック３４ａ～３４ｃ毎のＢＬ駆動量を、ＲＧＢの色毎に決定する（ステップＳ３０２）。 FIG. 6 is a flowchart for explaining the luminance unevenness initial correction process of the display device 30 in the embodiment.
First, an external optical sensor not included in the display device 30 is used at the time of assembling the device, and the luminance of the display screen of the display device 30 is changed to RGB colors at a plurality of measurement locations (for example, three locations of left, center, and right). Measurement is performed every time (step S301).
Next, the BL driving amount for each of the backlight blocks 34a to 34c is determined for each of the RGB colors so that the luminance unevenness of the screen, that is, the luminance deviation at each measurement location measured in step S101 is minimized (step S302). ).
　ＢＬ制御部３５は、決定されたバックライトブロック３４ａ～３４ｃ毎、ＲＧＢの色毎のＢＬ駆動量をＢＬ駆動量記憶部３７ｂに記憶させる（ステップＳ３０３）。
　ＢＬ制御部３５は、決定されたＢＬ駆動量で各バックライトブロック３４ａ～３４ｃを１ブロックずつ、ＲＧＢの色毎に点灯させ、ＢＬ光量検出部３３が各バックライトブロック３４ａ～３４ｃの光量値をＲＧＢの色毎に検出する（ステップＳ３０４）。
　ＢＬ制御部３５は、検出された各バックライトブロック３４ａ～３４ｃの光量値の比率をＲＧＢの色毎に算出する（ステップＳ３０５）。
　ＢＬ制御部３５は、算出した光量値の比率を基準光量比記憶部３７ａに記憶させ（ステップＳ３０６）、処理を終了する。 The BL control unit 35 causes the BL drive amount storage unit 37b to store the BL drive amount for each of the determined backlight blocks 34a to 34c and RGB colors (step S303).
The BL control unit 35 lights each of the backlight blocks 34a to 34c one block at a time with the determined BL driving amount for each RGB color, and the BL light amount detection unit 33 sets the light amount value of each of the backlight blocks 34a to 34c. Detection is performed for each of the RGB colors (step S304).
The BL control unit 35 calculates the ratio of the light amount values of the detected backlight blocks 34a to 34c for each RGB color (step S305).
The BL control unit 35 stores the calculated light amount value ratio in the reference light amount ratio storage unit 37a (step S306), and ends the process.
　図７は、同実施形態における表示装置３０の輝度ムラ再補正処理を説明するためのフローチャートである。
　ＢＬ制御部３５は、バックライトブロック３４ａ～３４ｃを一旦全て消灯させた後に、各バックライトブロック３４ａ～３４ｃを順次１ブロックずつ点灯させ、ＢＬ光量検出部３３にバックライトブロック毎の光量値をＲＧＢの色毎に検出させる（ステップＳ４０１）。
　ＢＬ制御部３５は、バックライトブロック３４ａ～３４ｃ毎の光量値の比率をＲＧＢの色毎に算出する（ステップＳ４０３）。
　ＢＬ制御部３５は、基準光量比記憶部３７ａが輝度ムラ初期補正処理において記憶したバックライトブロック３４ａ～３４ｃ毎の光量値の比率を読み出す（ステップＳ４０４）。
　ＢＬ制御部３５は、ＲＧＢの色毎に、ステップＳ４０６～ステップＳ４０８の処理を繰り返す（ステップＳ４０５）。
　ＢＬ制御部３５は、初期補正処理で記憶したバックライトブロック３４ａ～３４ｃ毎の光量値の比率とステップＳ４０３の処理において算出したバックライトブロック３４ａ～３４ｃ毎の光量値の比率とが同じか否かを判定する（ステップＳ４０６）。 FIG. 7 is a flowchart for explaining luminance unevenness re-correction processing of the display device 30 in the embodiment.
The BL control unit 35 once turns off all the backlight blocks 34a to 34c, and then turns on the backlight blocks 34a to 34c one by one in order, and causes the BL light amount detection unit 33 to change the light amount value for each backlight block to RGB. For each color (step S401).
The BL control unit 35 calculates the ratio of the light amount value for each of the backlight blocks 34a to 34c for each RGB color (step S403).
The BL control unit 35 reads the ratio of the light amount value for each of the backlight blocks 34a to 34c stored in the luminance unevenness initial correction process by the reference light amount ratio storage unit 37a (step S404).
The BL control unit 35 repeats the processing from step S406 to step S408 for each RGB color (step S405).
The BL control unit 35 determines whether or not the ratio of the light quantity value for each of the backlight blocks 34a to 34c stored in the initial correction process is the same as the ratio of the light quantity value for each of the backlight blocks 34a to 34c calculated in the process of step S403. Is determined (step S406).
　輝度ムラ初期補正処理で基準光量比記憶部３７ａが記憶したバックライトブロック３４ａ～３４ｃ毎の光量値の比率と輝度ムラ再補正処理で算出したバックライトブロック毎の光量値の比率とが異なる場合（ステップＳ４０６：ＮＯ）、ＢＬ制御部３５は、ステップＳ４０３の処理において算出したバックライトブロック３４ａ～３４ｃ毎の光量値の比率を、輝度ムラ初期補正処理において基準光量比記憶部３７ａが記憶したバックライトブロック３４ａ～３４ｃ毎の光量値の比率と同じになるようバックライトブロック３４ａ～３４ｃ毎のＢＬ駆動量を調整する（ステップＳ４０７）。 When the ratio of the light amount value for each of the backlight blocks 34a to 34c stored in the reference light amount ratio storage unit 37a in the luminance unevenness initial correction process is different from the ratio of the light amount value for each backlight block calculated in the luminance unevenness recorrection process ( In step S406: NO), the BL control unit 35 stores the ratio of the light amount value for each of the backlight blocks 34a to 34c calculated in the process of step S403, which is stored in the reference light amount ratio storage unit 37a in the luminance unevenness initial correction process. The BL drive amount for each of the backlight blocks 34a to 34c is adjusted so as to be the same as the ratio of the light amount value for each of the blocks 34a to 34c (step S407).
　ＢＬ制御部３５は、ステップＳ４０７の処理において調整されたＢＬ駆動量をＢＬ駆動量記憶部３７ｂに記憶する（ステップＳ４０８）。
　ＢＬ制御部３５は、ステップＳ４０５の処理において、ＲＧＢの各色についてステップＳ４０６～Ｓ４０８の処理を繰り返すと、処理を終了する。 The BL control unit 35 stores the BL drive amount adjusted in the process of Step S407 in the BL drive amount storage unit 37b (Step S408).
The BL control unit 35 ends the process when the process of steps S406 to S408 is repeated for each color of RGB in the process of step S405.
　以上より、本実施形態における表示装置１０，３０によれば、表示部１２，３２の輝度ムラに変化が生じた場合、輝度ムラが最小となるよう予め調整されたときのバックライトブロック１４ａ～１４ｃ，３４ａ～３４ｃの光量に基づいてバックライトブロック１４ａ～１４ｃ，３４ａ～３４ｃの駆動量を調整することにより輝度ムラを補正することができる。 As described above, according to the display devices 10 and 30 in the present embodiment, when the luminance unevenness of the display units 12 and 32 is changed, the backlight blocks 14a to 14c when the brightness unevenness is adjusted in advance to be minimized. , 34a to 34c can be used to adjust the drive amounts of the backlight blocks 14a to 14c and 34a to 34c to correct the luminance unevenness.
　また、本実施形態における表示装置１０の輝度ムラ補正方法は、従来の映像信号を補正して輝度ムラ補正する方法では高いバックライト光量が必要とされるのに比べ、低いバックライト駆動量で輝度ムラ補正ができるため、輝度ムラ補正を行う表示装置の消費電力の抑制、発熱の抑制、輝度寿命の改善（バックライト寿命の改善）、及び画質の指標となるコントラスト比や階調再現性の改善を図ることができる。 Further, the luminance unevenness correction method of the display device 10 according to the present embodiment has a lower backlight driving amount than the conventional method of correcting the luminance unevenness by correcting the video signal, which requires a higher backlight light amount. Because unevenness correction can be performed, power consumption of display devices that perform brightness unevenness correction, suppression of heat generation, improvement of luminance life (improvement of backlight life), and improvement of contrast ratio and gradation reproducibility as an index of image quality Can be achieved.
　なお、上述の実施例では、バックライト部１４，３４の発光体がＬＥＤである例により説明したが、これに限らず、例えばバックライト部１４，３４の発光体が冷陰極蛍光管（ＣＣＦＬ：Cold Cathode Fluorescent Lamp）や有機ＥＬ（Electro-Luminescence）であってもよい。 In the above-described embodiments, the light emitters of the backlight units 14 and 34 are LEDs. However, the present invention is not limited to this example. For example, the light emitters of the backlight units 14 and 34 are cold cathode fluorescent tubes (CCFLs). Cold Cathode Fluorescent Lamp) or organic EL (Electro-Luminescence) may be used.
　また、上述の実施例では、左バックライトブロック１４ａ，３４ａ、中央バックライトブロック１４ｂ，３４ｂ、右バックライトブロック１４ｃ，３４ｃの３つに分割されたバックライト部１４，３４が備えられる表示部１２，３２を例として説明したが、これに限らず、例えばバックライト部１４，３４が５つのブロックに分割されてもよい。 In the above-described embodiment, the display unit 12 includes the backlight units 14 and 34 that are divided into the left backlight blocks 14a and 34a, the central backlight blocks 14b and 34b, and the right backlight blocks 14c and 34c. , 32 has been described as an example, but the present invention is not limited to this, and for example, the backlight units 14, 34 may be divided into five blocks.
　また、上述の実施例では、バックライト光量検出部１３，３３を背面に設置していたが、前面に配置してもよい。さらに、バックライト部１４，３４の光量を検出する外部の輝度センサ等を表示装置１０，３０に接続してもよい。 In the above-described embodiment, the backlight light quantity detection units 13 and 33 are installed on the back surface, but may be disposed on the front surface. Further, an external luminance sensor or the like that detects the light amount of the backlight units 14 and 34 may be connected to the display devices 10 and 30.
　また、上述の実施例では、バックライト光量検出部１３，３３を背面左側端部に設置していたが、左右に設置してもよい。左右に設置すると、特に表示部１２，３２の面積が大きい場合に検出精度が上がる。 Further, in the above-described embodiment, the backlight light quantity detection units 13 and 33 are installed at the left end of the back surface, but they may be installed on the left and right. When installed on the left and right, the detection accuracy increases particularly when the areas of the display units 12 and 32 are large.
　また、上記に説明した表示装置の機能を実現するためのプログラムをコンピュータ読み取り可能な記録媒体に記録して、この記録媒体に記録されたプログラムをコンピュータシステムに読み込ませ、実行することにより輝度ムラ補正処理を行ってもよい。なお、ここでいう「コンピュータシステム」とは、ＯＳや周辺機器等のハードウェアを含むものとする。 Further, luminance non-uniformity correction is performed by recording a program for realizing the functions of the display device described above on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium. Processing may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices.
　また、「コンピュータシステム」は、ＷＷＷシステムを利用している場合であれば、ホームページ提供環境（あるいは表示環境）も含むものとする。
　また、「コンピュータ読み取り可能な記録媒体」とは、フレキシブルディスク、光磁気ディスク、ＲＯＭ、ＣＤ－ＲＯＭ等の可搬媒体、コンピュータシステムに内蔵されるハードディスク等の記憶装置のことをいう。さらに「コンピュータ読み取り可能な記録媒体」とは、サーバやクライアントとなるコンピュータシステム内部の揮発性メモリのように、一定時間プログラムを保持しているものを含むものとする。また上記プログラムは、前述した機能の一部を実現するためのものであっても良く、さらに前述した機能をコンピュータシステムにすでに記録されているプログラムとの組み合わせで実現できるものであってもよい。また、上記のプログラムを所定のサーバに記憶させておき、他の装置からの要求に応じて、当該プログラムを通信回線を介して配信（ダウンロード等）させるようにしてもよい。 Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” includes a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. Alternatively, the program may be stored in a predetermined server, and the program may be distributed (downloaded or the like) via a communication line in response to a request from another device.
　以上、この発明の実施形態について図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計等も含まれる。 As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within the scope not departing from the gist of the present invention.
　１，１０，３０　表示装置
　２，１２，３２　表示部
　３，１３，３３　ＢＬ光量検出部
　４，１４，３４　バックライト部
　５，１５，３５　ＢＬ制御部
　６，１６，３６　ＢＬ駆動部
　１４ａ，３４ａ　左ＢＬ
　１４ｂ，３４ｂ　中央ＢＬ
　１４ｃ，３４ｃ　右ＢＬ
　１６ａ，３６ａ　左ＢＬ駆動部
　１６ｂ，３６ｂ　中央ＢＬ駆動部
　１６ｃ，３６ｃ　右ＢＬ駆動部
　１７，３７　記憶部
　１７ａ，３７ａ　基準光量比記憶部
　１７ｂ，３７ｂ　ＢＬ駆動量記憶部
　１８　映像信号出力装置
　１９，３９　制御演算部
　２０，４０　入力部 1, 10, 30 Display device 2, 12, 32 Display unit 3, 13, 33 BL light amount detection unit 4, 14, 34 Backlight unit 5, 15, 35 BL control unit 6, 16, 36 BL drive unit 14a, 34a Left BL
14b, 34b Center BL
14c, 34c Right BL
16a, 36a Left BL drive unit 16b, 36b Central BL drive unit 16c, 36c Right BL drive unit 17, 37 Storage unit 17a, 37a Reference light quantity ratio storage unit 17b, 37b BL drive amount storage unit 18 Video signal output device 19, 39 Control calculation unit 20, 40 Input unit

Claims (5)

  1. 　複数のブロックに分割されたバックライトを有するバックライト部と該複数のブロックに分割されたバックライトの光量を検出し出力するバックライト光量検出部とを有する表示部と、
    　前記バックライト光量検出部から入力された各ブロックのバックライトの光量に基づき光量比を算出し、算出した光量比に基づいて各ブロックのバックライト駆動量を算出するバックライト制御部と、
    　前記バックライト制御部が算出した前記バックライト駆動量に応じて前記複数のブロックに分割されたバックライトを駆動するバックライト駆動部と、を備え、
    　前記バックライト制御部は、予め前記表示部における輝度ムラが最小となるよう調整された各ブロックのバックライトの光量比を基準光量比とし、前記算出した光量比と前記基準光量比に基づいて各ブロックのバックライトの光量を調整する
    　表示装置。     A display unit having a backlight unit having a backlight divided into a plurality of blocks and a backlight light amount detection unit for detecting and outputting the light amount of the backlight divided into the plurality of blocks;
    A backlight control unit that calculates a light amount ratio based on the light amount of the backlight of each block input from the backlight light amount detection unit, and calculates a backlight drive amount of each block based on the calculated light amount ratio;
    A backlight drive unit that drives the backlight divided into the plurality of blocks according to the backlight drive amount calculated by the backlight control unit,
    The backlight control unit uses a backlight light amount ratio of each block adjusted in advance to minimize luminance unevenness in the display unit as a reference light amount ratio, and based on the calculated light amount ratio and the reference light amount ratio, A display device that adjusts the light intensity of the block backlight.
  2. 　前記バックライト制御部は、複数の色の発光体を備える前記バックライト部の光量を前記バックライト光量検出部に色毎に検出させ、各ブロックの前記バックライトの光量を調整する
    　請求項１に記載の表示装置。     The backlight control unit adjusts the light amount of the backlight of each block by causing the backlight light amount detection unit to detect the light amount of the backlight unit including a plurality of color light emitters for each color. The display device described.
  3. 　前記バックライト制御部が算出した各ブロックのバックライトの光量比と各ブロックのバックライトの前記バックライト駆動量とを記憶する記憶部
    　をさらに備える請求項１または請求項２に記載の表示装置。     The display device according to claim 1, further comprising: a storage unit that stores a backlight light amount ratio of each block calculated by the backlight control unit and the backlight driving amount of the backlight of each block.
  4. 　前記バックライト光量検出部を前記表示部の左右の両端部に備えることを特徴とする請求項１ないし請求項３に記載の表示装置。 The display device according to any one of claims 1 to 3, wherein the backlight light amount detection unit is provided at both right and left ends of the display unit.
  5. 　複数のブロックに分割されたバックライトそれぞれの光量を検出し出力するバックライト光量検出ステップと、
    　前記バックライト検出ステップにおいて出力された各ブロックのバックライトの光量に基づき光量比を算出し、算出した光量比に基づいて各ブロックのバックライトのバックライト駆動量を算出する第一のバックライト制御ステップと、
    　前記第一のバックライト制御ステップにおいて算出されたバックライト駆動量に応じて各ブロックのバックライトを駆動するバックライト駆動ステップと、
    　予め前記表示部における輝度ムラが最小となるよう調整された各ブロックのバックライトの光量比を基準光量比とし、前記算出した光量比と前記基準光量比に基づいて、各ブロックのバックライトの光量を調整する第二のバックライト制御ステップと、
    　を有する表示装置の輝度ムラ補正方法。     A backlight light amount detection step for detecting and outputting the light amount of each of the backlights divided into a plurality of blocks;
    A first backlight control that calculates a light amount ratio based on the light amount of the backlight of each block output in the backlight detection step, and calculates a backlight driving amount of the backlight of each block based on the calculated light amount ratio Steps,
    A backlight driving step for driving the backlight of each block according to the backlight driving amount calculated in the first backlight control step;
    The light amount ratio of the backlight of each block that has been adjusted in advance to minimize the luminance unevenness in the display unit is set as a reference light amount ratio, and the light amount of the backlight of each block is based on the calculated light amount ratio and the reference light amount ratio. A second backlight control step to adjust,
    A luminance unevenness correcting method for a display device having
PCT/JP2012/083065 2012-12-20 2012-12-20 Display apparatus, and method for correcting luminance unevenness of display apparatus WO2014097447A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/083065 WO2014097447A1 (en) 2012-12-20 2012-12-20 Display apparatus, and method for correcting luminance unevenness of display apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/083065 WO2014097447A1 (en) 2012-12-20 2012-12-20 Display apparatus, and method for correcting luminance unevenness of display apparatus

Publications (1)

Publication Number Publication Date
WO2014097447A1 true WO2014097447A1 (en) 2014-06-26

Family

ID=50977825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/083065 WO2014097447A1 (en) 2012-12-20 2012-12-20 Display apparatus, and method for correcting luminance unevenness of display apparatus

Country Status (1)

Country Link
WO (1) WO2014097447A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007537477A (en) * 2004-05-14 2007-12-20 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Scanning backlight for matrix display
JP2008159550A (en) * 2006-12-26 2008-07-10 Toshiba Corp Backlight control device and backlight control method
JP2010015918A (en) * 2008-07-07 2010-01-21 Epson Imaging Devices Corp Lighting system, electrooptical device and electronic apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007537477A (en) * 2004-05-14 2007-12-20 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Scanning backlight for matrix display
JP2008159550A (en) * 2006-12-26 2008-07-10 Toshiba Corp Backlight control device and backlight control method
JP2010015918A (en) * 2008-07-07 2010-01-21 Epson Imaging Devices Corp Lighting system, electrooptical device and electronic apparatus

Similar Documents

Publication Publication Date Title
JP4714297B2 (en) Display device
TWI391750B (en) Light source unit for use in a lighting apparatus
JP5079882B2 (en) Backlight unit, liquid crystal display device, brightness control method, brightness control program, and recording medium
JP6039337B2 (en) Display device and control method thereof
JP2008304907A (en) Liquid crystal display, and image display method used therefor
JP2006303016A (en) Lighting device and display unit using the same
JP2013149417A (en) Backlight device and method of controlling the same
WO2009000182A1 (en) Methods and apparatus for backlight calibration
KR101796175B1 (en) Light guide plate and backlight assembly comprising the same
JP2007123279A (en) Driving device for backlight, backlight assembly, liquid crystal display device having the same, and driving method for backlight
JP2016184531A (en) Light source device, image display device and control method for light source device
JP2016510909A (en) Dual modulation display technology with light conversion
US20130021230A1 (en) Apparatus, Method and Module for Selective Pixel Control of Display
JP2009042652A (en) Liquid crystal display device and image display method thereof
RU2014139709A (en) MULTI-SCREEN DISPLAY DEVICE
KR20100021094A (en) Display apparatus and brightness correcting method thereof
JP2010128072A (en) Backlight driving device and backlight driving control method
JP2005208486A (en) Liquid crystal display
JP5297986B2 (en) Light source driving method and display device using the same
TWI408652B (en) Display method and color sequential display
JP2005049362A (en) Liquid crystal display device
US20090102854A1 (en) Display method and color sequential display
KR20200057256A (en) Display apparatus and driving method thereof
KR101588340B1 (en) Display device and method for driving the same
JP2009042650A (en) Liquid crystal display device and image display method thereof

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12890221

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12890221

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP