WO2014155446A1 - 表示装置 - Google Patents
表示装置 Download PDFInfo
- Publication number
- WO2014155446A1 WO2014155446A1 PCT/JP2013/006681 JP2013006681W WO2014155446A1 WO 2014155446 A1 WO2014155446 A1 WO 2014155446A1 JP 2013006681 W JP2013006681 W JP 2013006681W WO 2014155446 A1 WO2014155446 A1 WO 2014155446A1
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- WIPO (PCT)
- Prior art keywords
- display device
- display
- unit
- luminance
- viewer
- Prior art date
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- 230000001186 cumulative effect Effects 0.000 claims abstract 3
- 235000019557 luminance Nutrition 0.000 claims description 117
- 238000001514 detection method Methods 0.000 claims description 8
- 230000004044 response Effects 0.000 claims description 5
- 239000003086 colorant Substances 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000012937 correction Methods 0.000 description 12
- 230000006866 deterioration Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000005401 electroluminescence Methods 0.000 description 5
- 230000010354 integration Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2003—Display of colours
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
- G06F1/3231—Monitoring the presence, absence or movement of users
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0227—Cooperation and interconnection of the input arrangement with other functional units of a computer
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—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 using controlled light sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D11/00—Passenger or crew accommodation; Flight-deck installations not otherwise provided for
- B64D11/0015—Arrangements for entertainment or communications, e.g. radio, television
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
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- 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
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/046—Dealing with screen burn-in prevention or compensation of the effects thereof
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/048—Preventing or counteracting the effects of ageing using evaluation of the usage time
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
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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
- G09G2380/00—Specific applications
- G09G2380/12—Avionics applications
Definitions
- the present disclosure relates to a display device, and more particularly to a display device capable of displaying a moving image or a still image on a self-luminous display.
- Plasma displays and organic EL (Electro Luminescence) displays are used as display devices for personal computers and portable terminals.
- the display element has a characteristic that light emission luminance decreases in proportion to the amount of light emission and time. This decrease in light emission luminance is caused by deterioration of the light emission characteristics. When the deterioration of the light emission characteristics proceeds, the luminance decrease gradually proceeds even under the same driving conditions, and the initial luminance cannot be maintained. This decrease in the light emission luminance does not proceed uniformly on the display, and the light emission characteristics deteriorate within the screen. This is because the display content is not uniform by continuously displaying the same image. The state in which the variation in luminance deterioration is visually recognized is called a “burn-in phenomenon”.
- Patent Document 1 Several methods for delaying the occurrence of such image sticking have been proposed. (For example, refer to Patent Document 1 and Patent Document 2).
- the present disclosure provides a display device that is effective in suppressing variations in luminance deterioration in a display.
- a display device is a display device that displays information using a self-luminous display element, and controls a display unit in which a plurality of pixels composed of sub-pixels of a plurality of colors are arranged, and driving of the display unit
- a control unit is provided.
- the control unit records the accumulated luminance of each subpixel and calculates the luminance adjustment amount of each subpixel based on the difference between the accumulated luminances.
- the control unit detects that the viewer of the display device is absent, generates a corrected image corresponding to the brightness adjustment amount, and displays the corrected image on the display unit when the viewer is absent.
- the display device is effective in suppressing variations in luminance deterioration in the display.
- FIG. 1 schematically shows the overall configuration of a display device 1 (an example of a display device).
- the display device 1 is a terminal display device installed at each seat in the aircraft, and is a device that receives and displays data (video content, flight information, etc.) from the server 5 included in the aircraft system via a cable or the like.
- the display device 1 includes, for example, a control unit 20 (an example of a control unit), a memory 22, a data communication unit 23, an input unit 24, an image output unit 25, and a display 3 (an example of a display unit).
- the control unit 20 includes a CPU and the like, and controls the memory 22, the data communication unit 23, the input unit 24, and the image output unit 25.
- the control unit 20 also controls driving of the display 3.
- the memory 22 stores various data processed by the control unit 20.
- the data communication unit 23 is a communication interface that transmits information generated by the control unit 20 to the server 5 or receives information from the server 5 via a cable or the like installed in the aircraft.
- the input unit 24 is an input unit such as an operation button, a keyboard, a mouse, and a touch panel displayed on the display 3, and transmits information input by a user operation to the control unit 20.
- the display 3 is a display using a self-luminous display element such as a plasma display or an organic EL display.
- the display 3 has a display area composed of a plurality of pixels (pixels) regularly arranged vertically and horizontally. Each pixel includes three sub-pixels, and each sub-pixel is composed of sub-pixels each incorporating a light-emitting element that emits light for each of RGB colors.
- the control unit 20 executes the functions of the viewing detection unit 21 and the corrected image generation unit 10 according to a predetermined program.
- functions executed by the control unit 20 of the display device 1 will be described with reference to FIG. [1-1-1.
- Configuration of viewing detection unit 21 The viewing detection unit 21 includes a time measurement unit 211 and a corrected image display command unit 212.
- the time measuring unit 211 detects that the viewer is absent based on the flight information acquired from the server 5 and its own time information.
- the time when the viewer is absent is before the start of the flight of the aircraft, at the end of the flight, or the like.
- the correction image display command unit 212 commands the correction image generation unit 10 to display a correction image when the time measurement unit 211 detects, for example, before the start of the flight of the aircraft or the end of the flight of the aircraft.
- the corrected image generation unit 10 includes an RGB signal acquisition unit 11, an output time measurement unit 12, an RGB luminance integration unit 13, an RGB integrated luminance storage unit 14, an RGB integrated luminance comparison unit 15, and an RGB luminance adjustment unit 16.
- the RGB signal acquisition unit 11 acquires the RGB signal output to the display 3 by the image output unit 25. Specifically, the luminance value for each of the three sub-pixels (RGB) constituting each pixel of the display 3 is acquired.
- the output time measuring unit 12 measures the output time of each subpixel for the signal output from the image output unit 25.
- the RGB luminance integrating unit 13 integrates the luminance output for each subpixel based on the luminance of the signal acquired by the RGB signal acquiring unit 11 and the output time of each subpixel (for example, luminance ⁇ output time), An integrated luminance value (an example of accumulated luminance) is calculated.
- the RGB integrated luminance storage unit 14 stores the integrated luminance value calculated by the RGB luminance integrating unit 13.
- the RGB integrated luminance storage unit 14 may be provided in a part of a memory (for example, the memory 22) provided elsewhere.
- the RGB integrated luminance comparison unit 15 calculates the maximum integrated luminance value by comparing the integrated luminance values of the RGB sub-pixels in the entire screen in response to a command from the viewing detection unit 21.
- the RGB luminance adjusting unit 16 calculates the RGB integrated luminance. The difference between the maximum integrated luminance value output by the comparison unit 15 and the integrated luminance value of each subpixel is calculated, and the adjusted luminance value (an example of the luminance adjustment amount) of each subpixel is calculated.
- This adjusted luminance value is, for example, the luminance (0 to 100%) for a certain time. Note that the certain time is a preset time within a time corresponding to, for example, the absence of the viewer when the display device 1 operates.
- the corrected image output command unit 17 commands the image output unit 25 to output a corrected image corresponding to the adjusted luminance value of each subpixel calculated as described above.
- the corrected image output command unit 17 also stops the output of the corrected image when a certain time (corrected image output time) for outputting the corrected image has elapsed.
- the RGB signal resulting from the output of the corrected image by the image output unit 25 to the display 3 is acquired by the RGB signal acquisition unit 11 and is reflected in the integrated luminance value stored in the RGB integrated luminance storage unit 14. Therefore, the difference is updated so that the difference in the integrated luminance value among the sub-pixels of all the pixels is reduced.
- Step S101 The display device 1 is turned on, and the display 3 is in a state where information can be displayed in accordance with a command from the control unit 20.
- Step S102 The RGB signal acquisition unit 11 of the corrected image generation unit 10 of the control unit 20 acquires the signal amount for each of the RGB sub-pixels of the display 3 via the image output unit 25. At the same time, the output time of each subpixel is measured by the output time measuring unit 12. Based on the luminance value for each RGB subpixel and the output time of each subpixel, the RGB luminance integration unit 13 integrates the luminance output in each subpixel (for example, luminance ⁇ output time), and the RGB integrated luminance storage unit 14 is stored.
- Step S106 The RGB luminance adjusting unit 16 calculates a difference between the calculated maximum integrated luminance value and the integrated luminance value of each subpixel, and sets the difference as the adjusted luminance value of each subpixel.
- This adjusted luminance value is, for example, the luminance (0 to 100%) for a certain time.
- Step S107 The corrected image output command unit 17 instructs the image output unit 25 to output a corrected image corresponding to the adjusted luminance values of all the RGB subpixels calculated as described above.
- Step S108 If the corrected image output time has expired, the corrected image output command unit 17 proceeds to step S109 to end the process.
- FIG. 4 shows an example of the adjusted luminance value calculated by the display device 1.
- the left side of FIG. 4A shows the integrated luminance value of the RGB sub-pixel in a certain pixel.
- the maximum integrated luminance value calculated by the display device 1 is a value indicated by a dotted line, a difference from the integrated luminance value of each RGB sub-pixel in the pixel is calculated.
- an adjusted luminance value corresponding to the difference between the integrated luminance value of each subpixel and the maximum integrated luminance value is output as a corrected image.
- FIG. 4B shows the integrated luminance value of the RGB sub-pixels in a certain pixel.
- the G sub-pixel has the maximum integrated luminance value. Therefore, as shown on the right side of FIG. 4B, the adjusted luminance value corresponding to the difference from the maximum integrated luminance value is calculated for the R subpixel and the B subpixel, and the adjusted luminance value of the G subpixel is set to 0. A corrected image is output.
- the RGB signal as a result of outputting the corrected image is acquired by the RGB signal acquisition unit 11. Therefore, since the integrated luminance value stored in the RGB integrated luminance storage unit 14 is constantly updated by the image output for viewing and the output of the corrected image, the accumulated luminance of each subpixel is dynamically made uniform. can do.
- the adjustment luminance value is obtained from the difference between the maximum integrated luminance value and the integrated luminance value of each sub-pixel, but the present invention is not limited to this.
- FIG. 5 shows a modified example of the adjustment luminance value calculation by the display device 1.
- the RGB integrated luminance comparison unit 15 sets a predetermined target value (for example, an average integrated luminance value acquired in advance), and the RGB luminance adjustment unit 16 sets the target value and each subpixel.
- the difference from the integrated luminance value is set as the adjusted luminance value.
- the accumulated luminance value of the G subpixel exceeds the target value, and the accumulated luminance values of the R subpixel and the B subpixel are insufficient. Therefore, as shown on the right side of FIG. 5, the difference between the integrated luminance value of the R subpixel and the B subpixel and the target value is calculated as the adjusted luminance value, and the corrected image is output so that the G subpixel becomes zero.
- the G sub-pixel that exceeds the target value may be reflected in the integrated luminance value of the RGB integrated luminance storage unit, for example, with the excess difference as a negative value.
- the RGB luminance adjusting unit 16 calculates the luminance (0 to 100%) for a certain time as the adjusted luminance value, but the present invention is not limited to this.
- the RGB luminance adjustment unit 16 may be a light emission time (an example of luminance adjustment amount) when the luminance level is constant (for example, 100%).
- the corrected image output command unit 17 outputs a corrected image while controlling the light emission time of each subpixel.
- a threshold value may be given to the difference between the maximum integrated luminance value and the integrated luminance value of each subpixel. For example, in step S106 of FIG. 3, if the difference is less than a predetermined value, it is determined that there is no difference, and the adjusted luminance value may be set to zero.
- the display device 1 is an example of a terminal display device installed in an aircraft and connected to the server 5 by wire, but the present invention is not limited to this.
- it may be a wireless communication terminal (such as a smartphone or a tablet terminal) that can be wirelessly connected via an access point installed in an aircraft, and may have a display.
- the flight altitude information may be acquired from the flight information, and the correction image may be output in response to detecting when the altitude is below a certain altitude (that is, when taking off and landing and the display device 1 cannot be used).
- a human detection sensor such as a pyroelectric sensor or a seating sensor may be provided in the display device 1, and a corrected image may be output when a person is not detected for a certain period of time.
- the corrected image may be output by an operation using the input unit 24. Further, it is possible to detect that the operation by the input unit 24 is not performed for a certain period of time and output the corrected image.
- the present disclosure is applicable as a display device having a display using a self-luminous display element such as a plasma display or an organic EL display.
- Display device an example of a display device
- 3 Display example of display unit
- amendment image generation part 11 RGB signal acquisition part 12 Output time measurement part 13 RGB brightness
- amendment image output command part 20 Control part (control) Example)
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- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Human Computer Interaction (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
Description
自発光型の表示素子を用いディスプレイにおいては、表示素子は、発光量と時間に比例して発光輝度が低下する特性がある。この発光輝度の低下は、発光特性の劣化に起因し、発光特性の劣化が進行すると、同じ駆動条件下でも輝度低下が次第に進行し、初期輝度を維持できなくなる。この発光輝度の低下は、ディスプレイ上一様には進行せず、画面内で発光特性の劣化にばらつきが生じる。これは、同じ画像を継続的に表示し続けることにより表示内容が一様でないこと等が原因である。この輝度劣化のばらつきが視覚的に認識される状態をいわゆる「焼き付き現象」という。
本開示は、ディスプレイにおける輝度劣化のばらつきを抑えることに有効である表示装置を提供する。
なお、発明者らは、当業者が本開示を十分に理解するために添付図面及び以下の説明を提供するのであって、これらによって特許請求の範囲に記載の主題を限定することを意図するものではない。
(実施の形態)
[1-1.表示装置1の構成]
以下、本発明の一実施の形態に係る表示装置1が、輸送機関の1つである航空機内の客室エリアに設置されている事例を挙げて説明する。表示装置1は、視聴時間以外の時間において、ディスプレイの輝度劣化のばらつきを抑えるための所定の補正画像を生成し、表示する。
表示装置1は、例えば、制御部20(制御部の一例)、メモリ22、データ通信部23、入力部24、画像出力部25、及びディスプレイ3(表示部の一例)を備える。
メモリ22は、制御部20が処理する種々のデータを格納する。データ通信部23は、航空機内に敷設されたケーブル等を介して制御部20により生成される情報をサーバー5に送信し、或いはサーバー5からの情報を受信する通信インターフェースである。入力部24は、操作ボタン、キーボード、マウス、ディスプレイ3に表示されるタッチパネル等の入力手段であり、ユーザの操作により入力された情報を制御部20に送信する。
[1-1-1.視聴検出部21の構成]
視聴検出部21は、時間計測部211と補正画像表示指令部212を有する。時間計測部211は、サーバー5から取得されるフライト情報と自身の時間情報に基づき、視聴者が不在になったことを検出する。ここで、視聴者が不在になる時間とは、当該航空機のフライト開始前、フライト終了時等である。
以下、補正画像生成部10の機能について説明する。
[1-1-2.補正画像生成部10の構成]
補正画像生成部10は、RGB信号取得部11と、出力時間計測部12と、RGB輝度積算部13と、RGB積算輝度記憶部14と、RGB積算輝度比較部15と、RGB輝度調整部16と、補正画像出力指令部17とを有する。
出力時間計測部12は、画像出力部25により出力される信号について各サブピクセルによる出力時間を計測する。
RGB積算輝度記憶部14は、RGB輝度積算部13により算出された積算輝度値を記憶する。なお、RGB積算輝度記憶部14は、他に設けられたメモリ(例えば、メモリ22)等の一部に設けてもよい。
RGB輝度調整部16は、RGB積算輝度比較部15により出力された最大積算輝度値と、各サブピクセルの積算輝度値との差分を算出し、各サブピクセルの調整輝度値(輝度調整量の一例)を算出する。この調整輝度値は、例えば一定の時間に対する輝度(0~100%)である。なお、一定の時間とは、例えば表示装置1が作動し且つ視聴者不在時間に相当する時間内であって、予め設定されている時間である。
画像出力部25が補正画像をディスプレイ3に出力した結果のRGB信号は、RGB信号取得部11により取得され、RGB積算輝度記憶部14に記憶される積算輝度値に反映される。よって、全てのピクセルのサブピクセル間の積算輝度値の差は軽減されるように更新される。
図3を参照しながら、表示装置1の動作について説明する。
ステップS101:表示装置1の電源が入れられ、ディスプレイ3は、制御部20の指令に応じて情報を表示可能な状態となる。
ステップS102:制御部20の補正画像生成部10のRGB信号取得部11により、画像出力部25を介してディスプレイ3のRGBサブピクセルそれぞれに対する信号量が取得される。同時に、出力時間計測部12により、各サブピクセルによる出力時間が計測される。RGB輝度積算部13により、RGBサブピクセルそれぞれに対する輝度値と各サブピクセルによる出力時間とに基づき、各サブピクセルにおいて出力された輝度が積算され(例えば、輝度×出力時間)、RGB積算輝度記憶部14に記憶される。
ステップS104:視聴検出部21からの指令に応じて、RGB積算輝度比較部15により、各サブピクセルの積算輝度値を読み出す。
ステップS105:RGB積算輝度比較部15は、画面における全てのRGBサブピクセルの積算輝度値のうち最大値を判定し、最大積算輝度値とする。
ステップS107:補正画像出力指令部17により、上述のように算出された全てのRGBサブピクセルの調整輝度値に応じた補正画像を出力するよう、画像出力部25に指令する。
ステップS109:画像出力部25を介して出力された補正画像について、ステップS102と同様に、RGBサブピクセルそれぞれに対する輝度値と各サブピクセルによる出力時間とに基づき、各サブピクセルにおいて出力された輝度が積算され(例えば、輝度×出力時間)、RGB積算輝度記憶部14に記憶される。
なお、上記動作の流れは一例であり、その手順や処理の数は上記に限定されない。
図4は、上記表示装置1により算出された調整輝度値の例を示したものである。
図4(a)の左側は、あるピクセルにおけるRGBサブピクセルの積算輝度値を示す。上記表示装置1により算出された最大積算輝度値が点線で示した値であるとすると、当該ピクセルにおける各RGBサブピクセルの積算輝度値との差分が算出される。この結果、図4(a)の右側に示すように、各サブピクセルの積算輝度値と最大積算輝度値との差分に相当する調整輝度値が補正画像として出力される。
上記実施の形態によれば、表示装置1は、各サブピクセルについて積算輝度値を算出し、全てのサブピクセルについて積算輝度値と最大積算値との差分に相当する調整輝度値に応じた補正画像を出力するため、各ピクセルの累積輝度を均一化することができる。この結果、各ピクセルにおける発光特性の劣化のばらつきを抑えることができ、ディスプレイ上のいわゆる「焼き付き現象」の発生を遅らせ、画面の質を維持することができる。
上記実施の形態によれば、補正画像を出力した結果のRGB信号は、RGB信号取得部11により取得される。よって、RGB積算輝度記憶部14に記憶される積算輝度値は、視聴のための画像出力と補正画像の出力とによって常に更新されるため、各サブピクセルの累積輝度の均一化を動的に実行することができる。
上記実施の形態においては、最大積算輝度値と各サブピクセルの積算輝度値との差分によって調整輝度値を求めていたが、これに限定されない。
図5は、上記表示装置1による調整輝度値の算出の変形例を示す。同図の例においては、RGB積算輝度比較部15は予め決められた目標値(例えば、予め取得した平均的な積算輝度値)を設定し、RGB輝度調整部16は同目標値と各サブピクセルの積算輝度値との差分を調整輝度値とする。図5に示すピクセルの例では、目標値に対してGサブピクセルの積算輝度値が超過し、Rサブピクセル及びBサブピクセルの積算輝度値が足りない。よって、図5の右側に示すように、Rサブピクセル及びBサブピクセルの積算輝度値と目標値との差分が調整輝度値として算出され、Gサブピクセルは0となるように補正画像が出力される。
(他の実施の形態)
以上、図面を用いて本発明の実施形態を説明したが、本発明の具体的な構成は、前述の実施形態に限られるものではなく、発明の要旨を逸脱しない範囲で種々の変更及び修正が可能である。例えば、次のような変更が可能である。
上記実施の形態に係る表示装置1においては、RGB輝度調整部16は、一定の時間に対する輝度(0~100%)を調整輝度値として算出していたが、これに限定されない。RGB輝度調整部16は、輝度レベルを一定(例えば、100%)とした場合の発光時間(輝度調整量の一例)であってもよい。この場合、補正画像出力指令部17は、各サブピクセルの発光時間を制御しつつ補正画像を出力する。
上記実施の形態において、最大積算輝度値と各サブピクセルの積算輝度値との差分には閾値を持たせてもよい。例えば、図3のステップS106において、差分が所定の値未満であれば差分がないと判断し、調整輝度値を0としてもよい。
(3)
上記実施の形態においては、表示装置1は、航空機内に設置され、サーバー5に有線接続された端末表示装置を例にしていたがこれに限定されない。例えば、航空機内に設置されたアクセスポイントを介して無線接続可能な無線通信端末(スマートフォンやタブレット端末等)であって、ディスプレイを有するものであってもよい。
表示装置1はまた、プラズマディスプレイや有機ELディスプレイ等の自発光型の表示素子を用いディスプレイを有するテレビ等にも適用できる。
(4)
上記実施の形態においては、補正画像の出力は、表示装置1の視聴時間をフライト情報から予め取得し、視聴時間外を利用して行われているがこれに限定されない。
或いは、表示装置1に焦電センサや着座センサ等の人検出用センサを設け、人を一定時間以上検出しない場合に補正画像を出力するようにしてもよい。
また、入力部24による操作が一定時間以上なされないことを検出して、補正画像を出力するようにしてもよい。
3 ディスプレイ(表示部の一例)
5 サーバー
10 補正画像生成部
11 RGB信号取得部
12 出力時間計測部
13 RGB輝度積算部
14 RGB積算輝度記憶部
15 RGB積算輝度比較部
16 RGB輝度調整部
17 補正画像出力指令部
20 制御部(制御部の一例)
21 視聴検出部
211 時間計測部
212 補正画像表示指令部
22 メモリ
23 データ通信部
24 入力部
25 画像出力部
Claims (8)
- 自発光型の表示素子を用いて情報を表示する表示装置であって、
複数色のサブピクセルにより構成されるピクセルを複数配置した表示部、及び
前記表示部の駆動を制御する制御部、
を備え、
前記制御部は、
各サブピクセルの累積輝度を記録し、
前記累積輝度間の差分に基づく各サブピクセルの輝度調整量を算出し、
前記表示装置の視聴者が不在になることを検出し、
前記輝度調整量に応じた補正画像を生成し、
前記視聴者の不在中に前記補正画像を前記表示部に表示させる、
表示装置。 - 前記制御部は、航空機のフライト情報に基づき前記視聴者が不在になることを検出する、
請求項1に記載の表示装置。 - 前記制御部は、航空機の飛行高度情報に基づき前記視聴者が不在になることを検出する、
請求項1又は2に記載の表示装置。 - 人を検出するセンサを更に備え、
前記制御部は、前記センサによる検知に応じて前記視聴者が不在になることを検出する、
請求項1に記載の表示装置。 - 操作による入力を受け付ける入力部を更に備え、
前記制御部は、前記入力部による入力に応じて前記視聴者が不在になることを検出する、
請求項1に記載の表示装置。 - 前記累積輝度間の差分は、最大値に対する差分又は所定の目標値に対する差分のいずれかである、
請求項1から5のいずれかに記載の表示装置。 - 前記輝度調整量は、一定の時間に対する各サブピクセルの輝度又は各サブピクセルの一定の輝度に対する発光時間のいずれかである、
請求項1から6のいずれかに記載の表示装置。 - 前記各ピクセルは、R,G,Bの3つのサブピクセルにより構成される、
請求項1から7のいずれかに記載の表示装置。
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CN110580871A (zh) * | 2019-08-07 | 2019-12-17 | 深圳市华星光电半导体显示技术有限公司 | 一种智能化补偿残影的方法 |
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