WO2018131357A1 - Dispositif et procédé d'affichage - Google Patents

Dispositif et procédé d'affichage Download PDF

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Publication number
WO2018131357A1
WO2018131357A1 PCT/JP2017/044314 JP2017044314W WO2018131357A1 WO 2018131357 A1 WO2018131357 A1 WO 2018131357A1 JP 2017044314 W JP2017044314 W JP 2017044314W WO 2018131357 A1 WO2018131357 A1 WO 2018131357A1
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WIPO (PCT)
Prior art keywords
luminance
value
power
image data
relationship
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PCT/JP2017/044314
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English (en)
Japanese (ja)
Inventor
浩平 稲村
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キヤノン株式会社
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Publication date
Priority claimed from JP2017201871A external-priority patent/JP2018116256A/ja
Application filed by キヤノン株式会社 filed Critical キヤノン株式会社
Publication of WO2018131357A1 publication Critical patent/WO2018131357A1/fr
Priority to US16/512,015 priority Critical patent/US20190341003A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • 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
    • 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
    • G09G3/32—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 semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information

Definitions

  • the present invention relates to a display device and a display method.
  • HDR High Dynamic Range
  • a display device having a wide dynamic range of display luminance is referred to as an “HDR display device”.
  • the HDR display device can perform display with very high display luminance.
  • very high power consumption is required as the power consumption of the HDR display device.
  • An ABL (Auto Brightness Limiter) function is known as a function for reducing power consumption of a display device.
  • ABL Automatic Brightness Limiter
  • Patent Document 1 discloses an ABL function that limits power consumption within a predetermined range.
  • the first aspect of the present invention is: Setting means for setting gradation conversion characteristics for input image data; Correction means for performing correction processing on the input image data in accordance with the set gradation conversion characteristics and generating corrected image data; Display means for causing a light emitting unit to emit light at a light emission luminance based on the generated corrected image data and displaying an image based on the corrected image data; With The setting means acquires a power related value that is a value related to power consumption of the display device based on the input image data and the set first gradation conversion characteristic, and the acquired power related value is The display is characterized in that the setting is changed to the second gradation conversion characteristic that reduces the gradation value larger than the gradation threshold value of the input image data when it is larger than the power threshold value compared with the case where it is not. Device.
  • the second aspect of the present invention is: A setting step for setting gradation conversion characteristics for the input image data; A correction step for performing correction processing on the input image data according to the set gradation conversion characteristics and generating corrected image data; Displaying the image based on the corrected image data by causing the light emitting unit to emit light at a light emission luminance based on the generated corrected image data; Have In the setting step, a power related value that is a value related to power consumption of the display device is acquired based on the input image data and the set first gradation conversion characteristic, and the acquired power related value is The display is characterized in that the setting is changed to the second gradation conversion characteristic that reduces the gradation value larger than the gradation threshold value of the input image data when it is larger than the power threshold value compared with the case where it is not. Is the method.
  • a third aspect of the present invention is a program for causing a computer to execute each step of the display method described above.
  • the present invention it is possible to reduce the power consumption of the display device while maintaining display at a suitable display luminance.
  • FIG. 1 is a block diagram illustrating a configuration example of a display device according to a first embodiment.
  • 6 is a flowchart illustrating an operation example of the display device according to the first embodiment.
  • FIG. 6 is a diagram illustrating an example of a luminance relationship according to the first embodiment.
  • FIG. 9 is a block diagram illustrating a configuration example of a display device according to the second embodiment.
  • 10 is a flowchart illustrating an operation example of the display device according to the second embodiment.
  • FIG. 10 is a diagram illustrating an example of a luminance histogram according to the second embodiment. The figure which shows an example of the various parameters which concern on Example 2.
  • FIG. 9 is a block diagram illustrating a configuration example of a display device according to a third embodiment.
  • FIG. 9 is a block diagram illustrating a configuration example of a display device according to a fourth embodiment. The figure which shows an example of the luminance relationship which concerns on Example 4.
  • FIG. The figure which shows an example of the graphic image
  • Embodiment 1 of the present invention will be described below.
  • the display device according to the present embodiment is not limited to a transmissive liquid crystal display device.
  • another display device having a light emitting unit and a display panel (modulation panel) that displays an image on a screen by modulating (transmitting) light emitted from the light emitting unit may be used.
  • a MEMS shutter-type display device having a MEMS (Micro Electro Mechanical System) shutter, a projector, or the like may be used as the display element.
  • a self-luminous display device such as an organic EL (Electro Luminescence) display device or a plasma display device may be used.
  • the light emitting unit backlight unit
  • the light emission luminance of each light source unit is individually controlled.
  • Such control is called “local deming control”.
  • local dimming control By performing local dimming control, the contrast of the display image (image displayed on the screen) can be improved.
  • FIG. 1 is a block diagram illustrating a configuration example of a display device according to the present embodiment.
  • the luminance relationship setting unit (conversion characteristic setting unit) 1 sets a luminance relationship (gradation conversion characteristic) that is a correspondence relationship between the data luminance of the input image data and the display luminance of the display device for the first correction unit 2.
  • the data brightness of the input image data is, for example, “display brightness defined by the standard of the input image data”, “brightness assumed in the input image data”, “brightness represented by the input image data”, “input image data” It can also be said that “the gradation value”.
  • the display brightness is the screen brightness. It can also be said that the luminance relationship setting unit 1 sets a gradation conversion characteristic representing a correspondence relationship between the input gradation value and the output gradation value of the correction processing by the first correction unit 2.
  • the luminance relationship setting unit 1 is based on input image data and a candidate relationship (gradation conversion characteristic candidate) that is a candidate for a luminance relationship (gradation conversion characteristic) used in the first correction unit 2. Then, a power related value that is a value related to the power consumption of the display device when the candidate relationship is used as the luminance relationship is acquired.
  • the backlight unit 5 emits light with the light emission luminance based on the input image data and the luminance relationship. In this case, a value based on the light emission luminance of the backlight unit 5 can be used as the power-related value.
  • each of the plurality of light source units included in the backlight unit 5 emits light with individual light emission luminance based on the input image data and the luminance relationship.
  • values based on a plurality of light emission luminances respectively corresponding to the plurality of light source units can be used as the power-related values.
  • the luminance relationship setting unit 1 acquires a value based on the total luminance of a plurality of light emission luminances as a power related value.
  • values based on other light emission luminances such as the average luminance of a plurality of light emission luminances respectively corresponding to a plurality of light source units may be acquired as power-related values.
  • the number of light source units, the arrangement of the light source units, and the like are not particularly limited.
  • the plurality of light source units may be arranged in a matrix or in a staggered pattern.
  • the backlight unit 5 may have one light source unit. In that case, a value based on the light emission luminance of the light source unit can be used as the power-related value.
  • the luminance relationship setting unit 1 sets the second power relationship based on the acquired power related value.
  • a candidate relationship (second gradation conversion characteristic candidate) is determined.
  • the correspondence relationship in the range of the data luminance (data luminance of the input image data) whose power consumption is equal to or less than the power threshold and equal to or less than the luminance threshold (gradation threshold) is substantially the same as the first candidate relationship.
  • This is a candidate relationship.
  • “Power consumption corresponding to candidate relationship (gradation conversion characteristic candidate)” is “candidate relationship (gradation conversion characteristic candidate) is used as a luminance relationship (gradation conversion characteristic) of correction processing by the first correction unit 2. It can be said that the power consumption of the display device in the case. “Substantially identical” includes “completely identical”.
  • the luminance relationship setting unit 1 when the power consumption corresponding to the first candidate relationship is equal to or less than the power threshold, the luminance relationship setting unit 1 sets the first candidate relationship as the luminance relationship used by the first correction unit 2. .
  • the luminance relationship setting unit 1 sets the second candidate relationship as the luminance relationship used by the first correction unit 2.
  • the luminance relationship setting unit 1 outputs a correction value that does not correct the first candidate relationship to the first correction unit 2. To do.
  • the luminance relationship setting unit 1 sets a correction value for correcting the first candidate relationship to the second candidate relationship as the first correction unit. Output to 2. Note that other information (table, function, etc.) indicating the candidate relationship used as the luminance relationship may be output to the first correction unit 2.
  • the luminance relationship (gradation conversion characteristics) and the correction value used in the luminance relationship setting unit 1 may be for the luminance signal of the image data, or the R (red) signal / G (green) of the image data. For each of the signal and B (blue) signal.
  • the luminance relationship setting unit 1 may be configured to store a plurality of LUTs (Look Up Tables) corresponding to a plurality of candidate relationships (gradation conversion characteristic candidates) in advance and select a LUT to be used. Further, the luminance relationship setting unit 1 may be configured to store a function corresponding to the luminance relationship (gradation conversion characteristics) in advance and appropriately change a coefficient used in the function.
  • the first correction unit 2, the feature amount acquisition unit 3, the BL control value determination unit 4, the backlight unit 5, the second correction unit 6, and the liquid crystal panel 7 allow an image to be displayed on the screen based on the input image data and the luminance relationship. Is displayed.
  • the first correction unit 2 generates corrected image data by correcting the input image data in accordance with the luminance relationship set by the luminance relationship setting unit 1. Specifically, the first correction unit 2 corrects the input image data so that display according to the luminance relationship is performed. In the present embodiment, the first correction unit 2 corrects the input image data based on the correction value output from the luminance relationship setting unit 1 and the first candidate relationship.
  • the correction performed by the first correction unit 2 is, for example, gamma correction. It can be said that the first correction unit 2 converts the gradation value of the pixel according to the set luminance relationship (gradation conversion characteristic) for each of the plurality of pixels (all pixels) included in the input image data. .
  • the feature amount acquisition unit 3 acquires the feature amount of the corrected image data generated by the first correction unit 2 for each of the plurality of light source units included in the backlight unit 5.
  • each of the plurality of light source units is associated with at least a partial area (corresponding area) of the screen.
  • the plurality of light source units are respectively associated with a plurality of divided areas constituting the entire screen area.
  • the feature-value acquisition part 3 acquires the feature-value of the correction
  • the maximum value of a plurality of pixel values (gradation values) in the divided area is acquired as the feature amount.
  • the arrangement of the corresponding areas, the number of corresponding areas, the shape of the corresponding areas, etc. are not particularly limited.
  • the plurality of corresponding regions may be arranged in a matrix or in a staggered pattern.
  • the arrangement of the corresponding area may be the same as or different from the arrangement of the light source units.
  • the corresponding area may not be a divided area.
  • the corresponding area may be separated from other corresponding areas, or at least a part of the corresponding area may overlap with at least a part of the other corresponding area.
  • the correspondence relationship between the corresponding region and the light source unit may not be a one-to-one correspondence relationship.
  • two or more light source units may be associated with one partial region.
  • the area of the entire screen may be associated with one light source unit.
  • the shape of the corresponding region may be a quadrangle, a triangle, a pentagon, a circle, or the like.
  • the feature amount is not limited to the maximum pixel value.
  • other representative values average value, minimum value, intermediate value, mode value, etc.
  • pixel value histograms representative values of luminance values, histograms of luminance values, etc. are acquired as feature quantities. Also good.
  • the BL control value determination unit 4 determines the BL control value for each of the plurality of light source units according to the feature amount acquired by the feature amount acquisition unit 3.
  • the BL control value is a control value corresponding to the light emission luminance of the light source unit.
  • the BL control value determination unit 4 sets the light emission luminance of the light source unit corresponding to the divided region where the bright image is displayed to be higher than the light emission luminance of the light source unit corresponding to the divided region where the dark image is displayed.
  • the BL control value of each light source unit is determined so as to be controlled.
  • the correspondence relationship between the BL control value and the light emission luminance is not particularly limited, but in this embodiment, the higher the light emission luminance, the larger the BL control value.
  • the backlight unit 5 has a plurality of light source units.
  • Each of the plurality of light source units has one or more light emitting elements.
  • a light emitting diode, an organic EL element, a plasma element, a laser light source, or the like is used as the light emitting element.
  • Each of the plurality of light source units emits light according to the BL control value determined by the BL control value determination unit 4. Specifically, each of the plurality of light source units emits light with light emission luminance corresponding to the BL control value.
  • the second correction unit 6 generates display image data by correcting the corrected image data based on each BL control value determined by the BL control value determination unit 4.
  • the second correction unit 6 corrects the corrected image data so that a change in display luminance due to a change in the emission luminance of each light source unit from a predetermined reference luminance is suppressed.
  • the second correction unit 6 reduces the pixel value of the corrected image data (compression processing) for a region where the light emission luminance of the light source unit is increased from a predetermined reference luminance, and the light emission luminance of the light source unit is changed from the predetermined reference luminance.
  • the pixel value of the corrected image data is increased (decompression process).
  • the liquid crystal panel 7 displays an image on the screen by transmitting the light emitted from the backlight unit 5 according to the display image data generated by the second correction unit 6.
  • the liquid crystal panel 7 includes a liquid crystal driver, a control substrate, and a plurality of liquid crystal elements.
  • the control board controls the processing of the liquid crystal driver according to the display image data.
  • the liquid crystal driver drives each liquid crystal element in accordance with an instruction from the control board. Thereby, the transmittance (aperture ratio; modulation factor) of each liquid crystal element is controlled to a value corresponding to the display image data.
  • the light emitted from the backlight unit 5 passes through each liquid crystal element, whereby an image is displayed on the screen.
  • the first correction unit 2 corrects the input image data according to the luminance relationship set by the luminance relationship setting unit 1, thereby generating corrected image data. Specifically, the first correction unit 2 corrects each pixel value of the input image data using the following equations 1-1 and 1-2.
  • “Lin” is the data luminance of the input image data.
  • “Lout” is the data luminance of the corrected image data, and is the display luminance corresponding to the luminance relationship.
  • “Lmax” is the upper limit of the data luminance of the input image data.
  • the data luminance Lin below Lmax-CG is not converted.
  • the data luminance Lin below Lmax ⁇ CG is converted into a data luminance Lout equal to the data luminance Lin.
  • the data luminance Lin higher than Lmax-CG is converted into a data luminance Lout equal to Lmax-CG.
  • the data luminance Lout is substantially equal to the data luminance Lin corresponding to the data luminance Lout. “Substantially equal” includes “perfectly equal”.
  • the data luminance Lin is converted into the data luminance Lout according to the conversion characteristic of FIG.
  • the conversion characteristic in the range of the data luminance Lin below Lmax-CG is completely the same (substantially the same) as the conversion characteristic of FIG. Therefore, it can be said that “Lmax-CG” is the above-described “luminance threshold (tone threshold)”.
  • a conversion process (clip process) for clipping the output value Lout to a constant value Lmax-CG is performed on the range of the data luminance Lin that is greater than Lmax-CG.
  • the output value Lout in the range (gradation range) of the data luminance Lin larger than Lmax-CG is reduced to a value (gradation value) lower than the conversion characteristic of FIG. ing.
  • the first candidate relationship is not limited to the conversion characteristics shown in FIG.
  • the display brightness data brightness Lout
  • the first candidate relation other candidate relations for realizing display at a suitable display brightness regardless of the data brightness Lin may be used.
  • the correction value CG> 0, the correspondence relationship (conversion characteristics) in the range of the data luminance Lin below Lmax ⁇ CG is not completely the same as the first candidate relationship (conversion characteristics in FIG. 3A). May be.
  • the luminance relationship setting unit 1 acquires the feature amount of the corrected image data generated in S202 for each of the plurality of light source units.
  • the luminance relationship setting unit 1 has a feature amount acquisition function for executing processing similar to the processing of the feature amount acquisition unit 3.
  • the process of S203 is realized by the feature amount acquisition function of the luminance relationship setting unit 1.
  • the process executed by the feature amount acquisition function of the luminance relationship setting unit 1 may or may not be completely the same as the process of the feature amount acquisition unit 3.
  • a process that simplifies the process of the feature quantity acquisition unit 3 may be executed by the feature quantity acquisition function of the luminance relationship setting unit 1.
  • the luminance relationship setting unit 1 may acquire the feature amount from the input image data.
  • the luminance relationship setting unit 1 determines a BL control value for each of the plurality of light source units according to the feature amount acquired in S203.
  • the luminance relationship setting unit 1 has a control value determination function for executing the same processing as that of the BL control value determination unit 4.
  • the process of S204 is realized by the control value determination function of the luminance relationship setting unit 1.
  • the process executed by the control value determination function of the luminance relationship setting unit 1 may or may not be completely equal to the process of the BL control value determination unit 4.
  • a process that simplifies the process of the BL control value determination unit 4 may be executed by the control value determination function of the luminance relationship setting unit 1.
  • the luminance relationship setting unit 1 acquires a power-related value based on the plurality of BL control values determined in S204. Specifically, the luminance relationship setting unit 1 calculates the sum of a plurality of BL control values as a power related value.
  • the luminance relationship setting unit 1 determines whether or not the power consumption of the display device is greater than the power threshold based on the power-related value calculated in S205.
  • the luminance relationship setting unit 1 determines that the power consumption of the display device is larger than the power threshold value.
  • the luminance relationship setting unit 1 determines that the power consumption of the display device does not become larger than the power threshold value.
  • the luminance relationship setting unit 1 sets the luminance relationship to the second candidate relationship in which the correspondence relationship in the range of the data luminance Lin that is equal to or lower than the luminance threshold (less than the gradation threshold) is substantially the same as the first candidate relationship.
  • Update. Specifically, the luminance relationship setting unit 1 updates the correction value CG by adding the offset value ⁇ CG to the correction value CG. Then, the process returns to S202.
  • the conversion characteristic as shown in FIG. 3B is used in S202, and the power-related value corresponding to the second candidate relationship is acquired in S205. Then, the processes of S202 to S207 are repeated until it is determined that the power consumption of the display device does not exceed the power threshold.
  • the “power-related value corresponding to the candidate relationship (gradation conversion characteristic candidate)” is the “candidate relationship (gradation conversion characteristic candidate) used as the luminance relationship (gradation conversion characteristic) of correction processing by the first correction unit 2. It can also be said to be a value relating to power consumption of the display device in the case of “The process of adding the offset value ⁇ CG to the correction value CG” can be said to be “a process of reducing the luminance threshold (tone threshold)”.
  • the process proceeds to S207 and the display is performed using the first candidate relationship as the luminance relationship. Done. If the power consumption corresponding to the first candidate relationship is larger than the power threshold, the process proceeds to S207, the second candidate relationship is determined, and the display is performed using the second candidate relationship as the luminance relationship. Is called.
  • the second candidate relationship is determined as the first correction unit 2. It is determined as the luminance relationship used in.
  • the “power-related value below the threshold Wth” can be said to be “the power-related value related to power consumption below the power threshold”.
  • the luminance threshold value is set so that a power-related value equal to or lower than the threshold value Wth is acquired. Further, the updated second candidate relationship is updated.
  • the process of updating the second candidate relationship is repeated so that the luminance threshold is reduced until a power-related value equal to or lower than the threshold Wth is acquired. It can be said that “a power-related value larger than the threshold value Wth” is “a power-related value related to power consumption larger than the power threshold value”.
  • the subsequent stage of the first correction unit 2 (the feature amount acquisition unit 3 and the second correction unit 6). ) Is not output. Thereby, it is possible to perform display with power consumption equal to or lower than the power threshold. However, if display with power consumption equal to or greater than the power threshold is temporarily allowed, output to the subsequent stage may be performed when the second candidate relationship is updated. In this case, the flowchart of FIG. 2 is not applied to a single input image, but is applied to a plurality of temporally continuous input images. When the process proceeds from S207 to S202, the generation of the corrected image in S202 is applied to an input image that is later in time.
  • the luminance relationship setting unit 1 may be configured not to have a feature amount acquisition function and a control value determination function.
  • the second candidate relationship is determined when the power consumption corresponding to the first candidate relationship is larger than the power threshold.
  • the correspondence relationship in the range of the data luminance Lin that is equal to or lower than the luminance threshold is substantially the same as the first candidate relationship. Therefore, not only can the power consumption be reduced by using the second candidate relationship, but also the display luminance that is substantially the same as when the first candidate relationship is used in an area where the data luminance Lin is less than or equal to the luminance threshold. Display with can be realized. For example, in a region where the data luminance Lin is less than or equal to the luminance threshold, it is possible to realize a display that faithfully reproduces the display luminance defined by the input image data standard.
  • the offset value ⁇ CG may or may not be a fixed value.
  • the offset value ⁇ CG may be changed according to the difference between the power-related value and the threshold value Wth. Specifically, the larger the difference between the power-related value and the threshold value Wth, the larger the offset value ⁇ CG is set, so that the power consumption of the display device is less than or equal to the power threshold value by performing the processing of S202 to S207 only once. You may make it reduce to.
  • the offset value ⁇ CG may be changed according to a user operation on the display device. The offset value ⁇ CG may be determined so that the second correction relationship is determined only by performing the process of S207 once. In such a case, the luminance relationship setting unit 1 may acquire the feature amount from the input image data instead of from the corrected image data generated by the first correction unit 2.
  • the second candidate relationship is determined by determining the smaller luminance threshold as the power consumption corresponding to the first candidate relationship is larger.
  • the method for determining the second candidate relationship is not limited to the above method.
  • the second candidate is determined by determining the smaller inclination as the power consumption corresponding to the first candidate relationship is larger as the inclination of the display luminance change with respect to the change in the data luminance Lin that is greater than or equal to the luminance threshold (more than the gradation threshold).
  • a relationship may be determined.
  • the second candidate relationship may be determined by determining both the brightness threshold value and the slope, or the second candidate relationship may be determined by determining only one of the brightness threshold value and the slope.
  • the data luminance Lin is converted into the data luminance Lout according to the conversion characteristics of FIG. 3C (gradation compression processing).
  • the first correction unit 2 corrects each pixel value of the input image data using the following equations 2-1 and 2-2.
  • “Lth” is a luminance threshold value.
  • the correction value CG is the above inclination.
  • the luminance relationship setting unit 1 determines a value between 0 and 1 as the correction value CG. For example, when the power consumption corresponding to the first candidate relationship is larger than the power threshold, the luminance relationship setting unit 1 determines a smaller value as the power consumption corresponding to the first candidate relationship as the correction value CG. To do.
  • the slope is a slope of a change in an output value (output gradation value) with respect to a change in an input value (input gradation value) that is equal to or greater than a luminance threshold (tone threshold).
  • the data luminance Lout increases as the data luminance Lin increases. Therefore, for a region where the data luminance Lin is higher than the luminance threshold value, a luminance distribution expressing a difference (change) in the data luminance Lin can be obtained as a luminance distribution in the region, instead of a uniform luminance distribution.
  • the first candidate relationship is not limited to the candidate relationship (conversion characteristics) in FIG.
  • the display brightness (data brightness Lout) may increase linearly with an increase in data brightness Lin, or the display brightness (data brightness Lout) may increase non-linearly with an increase in data brightness Lin.
  • Both a linear portion where the display luminance increases linearly with respect to the increase in the data luminance Lin and a non-linear portion where the display luminance increases nonlinearly with respect to the increase in the data luminance Lin may be included.
  • the second candidate relationship is not limited to the candidate relationship (conversion characteristics) shown in FIGS. 3 (B) and 3 (C).
  • the second candidate relationship may be a candidate relationship in which the power consumption of the display device is equal to or lower than the power threshold value and the correspondence relationship in the range of the data luminance Lin equal to or lower than the luminance threshold value is substantially the same as the first candidate relationship.
  • a value larger than that when the power consumption corresponding to the first candidate relationship is small may be used as the luminance threshold.
  • a larger gradient may be used as the gradient than when the power consumption corresponding to the first candidate relationship is small.
  • the same display brightness as that of the first candidate relationship may be used.
  • the display luminance may increase linearly with respect to the increase in the data luminance Lin, or the display luminance may increase nonlinearly with respect to the increase in the data luminance Lin.
  • the display luminance may increase linearly with respect to the increase of the data luminance Lin, or the display luminance may increase nonlinearly with respect to the increase of the data luminance Lin.
  • the range of the data luminance Lin below the luminance threshold may include both a linear portion and a non-linear portion.
  • the range of the data luminance Lin that is higher than the luminance threshold may include both a linear portion and a non-linear portion.
  • FIG. 4 is a block diagram illustrating a configuration example of the display device according to the present embodiment. 4, the same reference numerals as those in the first embodiment are assigned to the same functional units as those in the first embodiment (FIG. 1).
  • the corrected image data generated by the first correction unit 2 is used as display image data.
  • the first correction unit 2 outputs display image data (corrected image data) to the organic EL panel 8.
  • the organic EL panel 8 is a self-luminous display panel that displays an image on a screen according to display image data.
  • the processing of the luminance relationship setting unit (conversion characteristic setting unit) 1 is different from that of the first embodiment.
  • the power consumption of the display device is approximately proportional to the display brightness.
  • a self-luminous display panel When a self-luminous display panel is used, a plurality of data luminances Lin corresponding to a plurality of pixels (all pixels) of the input image data are converted according to a candidate relationship (gradation conversion characteristic candidate).
  • a value based on a plurality of display luminances (data luminance Lout) obtained in this manner can be used as the power related value.
  • the luminance relationship setting unit 1 sets a value based on the total luminance of a plurality of data luminances Lout (a plurality of data luminances Lout corresponding to a plurality of pixels (all pixels)) according to the candidate relationship as a power related value. Get as.
  • the first correction unit 2 converts the data luminance Lin included in the pixel into display luminance according to the set luminance relationship (gradation conversion characteristics). Conversion into (data luminance Lout). It can be said that the first correction unit 2 converts the gradation value of the pixel according to the set luminance relationship (gradation conversion characteristic) for each of the plurality of pixels (all pixels) included in the input image data. . Then, the luminance relationship setting unit 1 acquires the data luminance Lout of each pixel, and acquires (generates) a luminance histogram based on the data luminance Lout of each pixel.
  • a plurality of luminance category values respectively corresponding to a plurality of ranges constituting a predetermined range of the data luminance Lout are predetermined.
  • n integers from 1 to n are determined in advance as the plurality of luminance category values, and the luminance category value increases as the data luminance Lout increases.
  • the process of acquiring the brightness histogram is a process of counting the number of pixels (frequency) having the data brightness Lout of the brightness category value for each of the plurality of brightness category values.
  • the luminance relationship setting unit 1 calculates the power-related value TW using the following Expression 3.
  • Ct (x) is the frequency Ct of the luminance category value x (x is an integer greater than or equal to 1 and less than or equal to n).
  • the sum of a plurality of frequencies Ct (x) respectively corresponding to the plurality of luminance category values x is calculated as the power-related value TW.
  • TW 1 ⁇ Ct (1) + 2 ⁇ Ct (2). + (N ⁇ 1) ⁇ Ct (n ⁇ 1) + n ⁇ Ct (n) ... (Formula 3)
  • the number of luminance category values is not particularly limited.
  • the correspondence relationship between the luminance category value and the data luminance Lout is not particularly limited.
  • the luminance category value may be smaller as the data luminance Lout is higher.
  • a plurality of data luminances Lout may or may not belong to the range corresponding to the luminance category value.
  • One data luminance Lout may belong to the range corresponding to the luminance category value.
  • the data luminance Lout may be used as the luminance category value.
  • the predetermined range is not particularly limited. For example, the range of the data luminance Lout obtained by the first candidate relationship is used as the predetermined range.
  • a value based on another display luminance such as an average luminance of a plurality of display luminances according to the candidate relationship may be acquired as the power-related value.
  • An average luminance level (APL: Average Pixel Level) of image data may be acquired as a power-related value.
  • the luminance relationship setting unit 1 determines, for each of the plurality of luminance category values x, a power-related value tW (x) related to the power consumption required for displaying the pixel corresponding to the luminance category value x. To do. Specifically, the luminance relationship setting unit 1 calculates the power-related value tW (x) by multiplying the luminance category value x by the frequency Ct (x). The power related value tW (x) is a value tW corresponding to the luminance category value x. The power-related value tW (x) is also a value when the first candidate relationship is used as the luminance relationship.
  • the luminance relationship setting unit 1 calculates, for each of the plurality of luminance category values x, the total sum WUsum (x) of the power related values tW of the luminance category values smaller than the luminance category value x. Specifically, the luminance relationship setting unit 1 calculates a power-related value (total) WUsum (x) using the following equations 4-1 and 4-2.
  • the power related value WUsum (x) is a value WUsum corresponding to the luminance category value x. “Power-related value WUsum (x)” can also be said to be “power consumption required for display of pixels corresponding to a luminance category value smaller than luminance category value x”.
  • the power related value WUsum (x) is also a value when the first candidate relationship is used as the luminance relationship.
  • the luminance relationship setting unit 1 assumes that the luminance category value larger than the luminance category value x is equal to the luminance category value x for each of the plurality of luminance category values x. x) is determined.
  • the power related value Wasum (x) is a value Wasum related to the power consumption required for displaying the pixel corresponding to the luminance category value x.
  • the luminance relationship setting unit 1 calculates the sum tTW (x) of the power related value WUsum (x) and the power related value Wasum (x) for each of the plurality of luminance category values x.
  • the power related value (sum) tTW (x) is a value tTW corresponding to the luminance category value x.
  • Ask. the plurality of power related values TW respectively corresponding to the plurality of candidate relationships are obtained as the plurality of power related values tTW (x).
  • the correspondence relationship in the range of the data luminance Lin that is equal to or less than the luminance threshold is substantially the same as the first candidate relationship.
  • the luminance threshold corresponds to the luminance category value x.
  • the luminance threshold is equal to the data luminance Lout of the luminance category value x.
  • the luminance relationship setting unit 1 determines, based on the plurality of power related values tTW (x), one of the plurality of candidate relationships respectively corresponding to the plurality of power related values tTW (x) as the luminance. Determine as a relationship. Specifically, the luminance relationship setting unit 1 determines the correction value CG so that the luminance threshold value corresponding to the luminance category value x of the power related value tTW (x) equal to or less than the threshold value Wth is set. When two or more power related values tTW (x) less than or equal to the threshold Wth are obtained, the brightness relationship setting unit 1 determines the brightness category of the maximum value of the two or more power related values tTW (x). The correction value CG is determined so that a luminance threshold value corresponding to the value x is set.
  • the power consumption value of the display device can be reduced below the power threshold value by using the candidate relationship whose power related value tTW (x) is equal to or less than the threshold value Wth as the luminance relationship. Therefore, according to the above processing in S506, a candidate relationship in which the power consumption related to the power related value tTW (x) is equal to or less than the power threshold is determined as the luminance relationship.
  • the power related value tTW (x) related to the power consumption below the power threshold may be acquired for two or more candidate relationships among a plurality of candidate relationships. In that case, the candidate relationship having the largest power consumption related to the power related value tTW (x) among the two or more candidate relationships is determined as the luminance relationship.
  • the first candidate relationship as shown in FIG. 3A is determined as the luminance relationship.
  • the second candidate relationship as shown in FIG. 3B is determined as the luminance relationship.
  • the luminance category value x is a five-level value from 1 to 5, and the input image data has a total of 50 pixels of 10 pixels in the horizontal direction and 5 pixels in the vertical direction.
  • the power consumption of the display device is maximized.
  • the power-related value TW power consumption of the display device
  • the luminance histogram of FIG. 6 is acquired. Specifically, the frequency Ct (x) in FIG. 7 is acquired.
  • the power related values tW (1), tW (2), tW (4), and tW (5) are calculated in the same manner.
  • the power related value Wasum (x) in FIG. 7 is calculated.
  • “UpCt (x)” is the number (frequency) of pixels corresponding to a luminance category value equal to or higher than the luminance category value x.
  • the power related values Wasum (1), Wasum (2), Wasum (4), and Wasum (5) are calculated in the same manner.
  • the power related value tTW (x) in FIG. 7 is calculated.
  • the power related values tTW (1), tTW (2), tTW (3), and tTW (4) are similarly calculated.
  • the maximum value of the luminance category value x corresponding to the power related value tTW (x) equal to or less than the threshold value Wth is detected.
  • the second candidate relationship corresponding to the power related value tTW (3) is used as the luminance relationship.
  • output to the subsequent stage (organic EL panel 8) of the first correction unit 2 is not performed until the correction value CG is determined in S506. Thereby, it is possible to perform display with power consumption equal to or lower than the power threshold.
  • the second candidate relationship is determined when the power consumption corresponding to the first candidate relationship is larger than the power threshold.
  • the method for determining the luminance relationship is not limited to the above method.
  • the luminance relationship setting unit 1 sets a luminance threshold value corresponding to the luminance category value x of the power-related value tTW (x) that is not the maximum value among two or more power-related values tTW (x) that are equal to or less than the threshold value Wth. May be.
  • the luminance relationship setting unit 1 may acquire a plurality of luminance histograms respectively corresponding to the plurality of candidate relationships by setting each of the plurality of candidate relationships as a luminance relationship. Then, the luminance relationship setting unit 1 may acquire a plurality of power related values tTW (x) using a plurality of luminance histograms.
  • the luminance relationship setting unit 1 may acquire the power related value tTW (x) for each of the plurality of candidate relationships by the method of the first embodiment. Further, the luminance relationship setting unit 1 may acquire the feature amount from the input image data instead of from the data luminance Lout obtained by the first correction unit 2.
  • FIG. 8 is a block diagram illustrating a configuration example of the display device according to the present embodiment.
  • the same reference numerals as those in the first embodiment are assigned to the same functional units as those in the first embodiment (FIG. 1).
  • the threshold setting unit 9 sets a threshold Wth according to a user operation on the display device. Specifically, the threshold setting unit 9 outputs a threshold Wth corresponding to the user operation to the luminance relationship setting unit (conversion characteristic setting unit) 1.
  • the luminance relationship setting unit 1 stores and uses the threshold value Wth output from the threshold value setting unit 9. As described above, in this embodiment, the threshold value Wth is appropriately changed according to the user operation.
  • the threshold value Wth (power threshold value) is appropriately changed according to the user operation. Thereby, the power consumption of the display device can be reliably reduced to the power consumption desired by the user.
  • the configuration of this embodiment is preferable, for example, when it is desired to extend the usable time of a battery-powered display device.
  • a user operation for reducing the threshold value Wth (power threshold value) can extend the usable time of the battery-powered display device.
  • FIG. 9 is a block diagram illustrating a configuration example of the display device according to the present embodiment. 9, the same reference numerals as those in the first embodiment are assigned to the same functional units as those in the first embodiment (FIG. 1).
  • the first correction unit 2 uses a candidate relationship (gradation conversion characteristic candidate) according to a user operation on the display device as a luminance relationship (gradation conversion characteristic) of correction processing by the first correction unit 2.
  • a candidate relationship luminance relationship (gradation conversion characteristic) of correction processing by the first correction unit 2.
  • the power limiting unit 11 is configured so that the power consumption is equal to or lower than the power threshold. Processing for display in which display luminance is reduced at substantially the same ratio over the entire screen is performed.
  • “restricted display” a display in which the display luminance is reduced at substantially the same ratio over the entire screen so that the power consumption is equal to or less than the power threshold value
  • the power limiting unit 11 determines the power consumption corresponding to the current luminance relationship used in the first correction unit 2 based on the plurality of BL control values output from the BL control value determination unit 4. To do. When the determined power consumption is larger than the power threshold, the power limiting unit 11 reduces the plurality of BL control values at the same ratio so that the power consumption is equal to or less than the threshold. Then, the power limiting unit 11 outputs the reduced BL control value to the backlight unit 5. As a result, the light source unit of the backlight unit 5 emits light with the light emission luminance corresponding to the BL control value after reduction, and the limited display is performed. In the present embodiment, the higher the emission luminance, the larger the BL control value.
  • BL control value reduction is “reduction of emission luminance”.
  • the limited display can be realized by reducing each pixel value of the display image data at the same ratio. If the determined power consumption is less than or equal to the power threshold, the power limiting unit 11 outputs the plurality of BL control values output from the BL control value determining unit 4 to the backlight unit 5. As a result, the light source unit emits light with a light emission luminance corresponding to the BL control value output from the BL control value determination unit 4.
  • the power limiting unit 11 corresponds to the current luminance relationship used in the first correction unit 2. It is determined that the power consumption is greater than the power threshold.
  • the power limiting unit 11 corresponds to the current luminance relationship used in the first correction unit 2 when the sum of the plurality of BL control values output from the BL control value determination unit 4 is equal to or less than the threshold value Wth. It is determined that the power consumption is below the power threshold.
  • the actual luminance relationship is a correspondence relationship between the data luminance Lin and the actual display luminance confirmed by the user.
  • Reference numeral 101 indicates a candidate relationship corresponding to a user operation, that is, a luminance relationship used in the first correction unit 2.
  • the limited display is not performed and the luminance relationship 101 becomes the actual luminance relationship.
  • pixels having a data luminance Lin that is equal to or lower than the luminance threshold (tone threshold) of the luminance relationship 101 can be displayed with substantially the same display luminance as when the first candidate relationship is used.
  • the luminance relationship 102 obtained by reducing each display luminance in the luminance relationship 101 becomes the actual luminance relationship.
  • a pixel having a data luminance Lin equal to or lower than the luminance threshold value of the luminance relationship 101 cannot be displayed with substantially the same display luminance as when the first candidate relationship is used.
  • the difference in the data luminance Lin can be displayed for the range of the data luminance Lin that is equal to or lower than the luminance threshold value of the luminance relationship 101.
  • the parameter display / setting unit 10 determines a candidate relationship according to a user operation on the display device, and outputs information on the determined candidate relationship to the luminance relationship setting unit (conversion characteristic setting unit) 1.
  • the luminance relationship setting unit 1 determines a candidate relationship according to the user operation from the information output from the parameter display / setting unit 10. Then, the luminance relationship setting unit 1 sets the determined candidate relationship as the luminance relationship for the first correction unit 2.
  • the parameter display / setting unit 10 determines a luminance threshold according to a user operation, and outputs the determined luminance threshold to the luminance relationship setting unit 1. Then, the luminance relationship setting unit 1 sets the luminance threshold output from the parameter display / setting unit 10 for the first correction unit 2.
  • the data luminance Lin that is equal to the data luminance Lin is associated with the data luminance Lin that is equal to or lower than the luminance threshold
  • the data luminance Lin that is equal to the luminance threshold is associated with the data luminance Lin that is higher than the luminance threshold.
  • the relationship is used in the first correction unit 2.
  • the method for determining the candidate relationship according to the user operation is not particularly limited.
  • other parameters such as a slope of a change in display luminance with respect to a change in data luminance Lin that is equal to or higher than the luminance threshold may be determined according to a user operation.
  • the parameter display / setting unit 10 notifies the user of information regarding candidate relationships in which the power consumption of the display device is equal to or less than the power threshold. Thereby, the user can easily grasp a candidate relationship in which power consumption is equal to or less than the power threshold, and can easily perform an operation for setting a candidate relationship in which power consumption is equal to or less than the power threshold.
  • a candidate relationship in which the power consumption of the display device is less than or equal to the power threshold can be determined from, for example, a power-related value, a correction value CG, and the like.
  • the upper limit Lmax of the data luminance Lin is 2000 cd / m 2 .
  • parameter display / setting unit 10 for example, information indicating a 0 cd / m 2 or more and 2000 cd / m 2 or less of the range, and notifies the user.
  • the user can easily grasp the range of the luminance threshold value where the power consumption is equal to or less than the power threshold value, and can easily perform an operation for setting the luminance threshold value where the power consumption is equal to or less than the power threshold value. it can.
  • the parameter display / setting unit 10 further notifies the user of information regarding the current luminance relationship used in the first correction unit 2. Thereby, the user can easily grasp the current luminance relationship used in the first correction unit 2, and can easily perform an operation for updating the actual luminance relationship to a desired candidate relationship. it can.
  • the notification of information to the user is realized by, for example, image display, audio output, lamp lighting, and the like.
  • information is notified to the user by displaying graphic images as shown in FIGS. 11 (A) to 11 (C).
  • a line 111 indicates a luminance threshold corresponding to a user operation, that is, a luminance-related luminance threshold used in the first correction unit 2.
  • the bar 112 indicates the range of the brightness threshold where the power consumption is equal to or less than the power threshold.
  • the line 111 represents the 1500 cd / m 2
  • bar 112 represents the 2000 cd / m 2 or less.
  • the candidate relation corresponding to the user operation is the actual luminance relationship.
  • the luminance relationship 101 in FIG. 10A is an actual luminance relationship.
  • the bar 112 does not mean that there is a pixel having a data luminance Lin of 2000 cd / m 2 or less. Therefore, the user may be further notified of the maximum brightness of the data brightness Lin that the input image data has.
  • line 111 represents the 1500 cd / m 2
  • bar 112 represents the 1000 cd / m 2 or less.
  • 1500 cd / m 2 is higher than 1000 cd / m 2
  • limited display is performed, the luminance relationship with reduced each display luminance of the candidate relations in accordance with the user operation is the actual luminance relationship.
  • the luminance relationship 102 in FIG. 10A is an actual luminance relationship.
  • the user can easily grasp that the restriction display is not performed if a luminance threshold value of 1000 cd / m 2 or less is set.
  • the brightness-related brightness threshold used in the first correction unit 2 is updated to 1000 cd / m 2 .
  • the restriction display is not performed, and the candidate relationship according to the user operation becomes the actual luminance relationship.
  • the luminance relationship 103 in FIG. 10B is an actual luminance relationship.
  • the range of data luminance Lin to show the differences in data luminance Lin is from 1500 cd / m 2 or less in the range, in the range of 1000 cd / m 2 or less It narrows.
  • a pixel having a data luminance Lin of 1000 cd / m 2 or less can be displayed with substantially the same display luminance as when the first candidate relationship is used.
  • the user performs an operation to update the brightness threshold value, so that the display with a wide range of data brightness Lin that can display the difference in the data brightness Lin and the display that is substantially the same as when the first candidate relationship is used. Display with brightness can be selected.
  • the graphic image is updated from the graphic image in FIG. 11B to the graphic image in FIG. Thereby, the user can easily grasp that the restriction display is not performed.
  • the user is notified of information on candidate relationships in which the power consumption of the display device is equal to or less than the power threshold.
  • the convenience of the display device can be improved.
  • the user can easily perform an operation for obtaining various desired luminance relationships as actual luminance relationships.
  • various luminance relationships for example, a luminance relationship with a wide range of data luminance Lin that can display a difference in data luminance Lin, a luminance relationship that can realize display with substantially the same display luminance as when the first candidate relationship is used, Etc.
  • the graphic image for notification is not limited to the graphic images of FIGS. 11 (A) to 11 (C).
  • an icon, a text image, or the like may be used instead of at least one of the line 111 and the bar 112
  • an icon, a text image, or the like may be used. More specifically, the "current brightness threshold is 1000cd / m 2", "1500cd / when m 2 high brightness threshold than has been set brightness of the entire screen will decrease”, text image etc. is displayed May be.
  • each functional unit in the first to fourth embodiments may or may not be a separate hardware.
  • the functions of two or more functional units may be realized by common hardware.
  • Each of a plurality of functions of one functional unit may be realized by individual hardware.
  • Two or more functions of one functional unit may be realized by common hardware.
  • Each functional unit may be realized by hardware or not.
  • the apparatus may include a processor and a memory in which a control program is stored. The functions of at least some of the functional units included in the apparatus may be realized by the processor reading and executing the control program from the memory.
  • the first to fourth embodiments are merely examples, and the present invention includes configurations obtained by appropriately modifying or changing the configurations of the first to fourth embodiments within the scope of the present invention. Configurations obtained by appropriately combining the configurations of Examples 1 to 4 are also included in the present invention.
  • the present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
  • a circuit for example, ASIC

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Abstract

La présente invention concerne un dispositif d'affichage qui comprend un moyen de réglage pour établir des caractéristiques de conversion de gradation pour des données d'image d'entrée, un moyen de correction pour corriger les données d'image d'entrée conformément aux caractéristiques de conversion de gradation établies afin de générer ainsi des données d'image corrigées, et un moyen d'affichage pour amener une partie électroluminescente à émettre de la lumière au niveau d'une luminance d'émission sur la base des données d'image corrigées générées afin d'afficher ainsi une image sur la base des données d'image corrigées. Le moyen de réglage acquiert une valeur d'association de puissance associée à la consommation d'énergie du dispositif d'affichage sur la base des données d'image d'entrée et des premières caractéristiques de conversion de gradation établies. Lorsque la valeur d'association de puissance acquise est supérieure à un seuil de puissance, le moyen de réglage change les caractéristiques établies en secondes caractéristiques de conversion de gradation qui réduisent une valeur de gradation supérieure à un seuil de gradation pour les données d'image d'entrée par comparaison avec les autres cas.
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JP2006106495A (ja) * 2004-10-07 2006-04-20 Sharp Corp 画像表示装置および携帯型端末装置
US20070091019A1 (en) * 2005-10-20 2007-04-26 Samsung Electronics Co., Ltd. Display apparatus and control method thereof
JP2008070496A (ja) * 2006-09-13 2008-03-27 Sony Corp 消費電力削減装置、視認性向上装置、自発光表示装置、画像処理装置、電子機器、消費電力削減方法、視認性向上方法及びコンピュータプログラム
JP2010537221A (ja) * 2007-12-26 2010-12-02 シャープ株式会社 画像特性マッピングによるバックライト変調の為の方法
JP2014142480A (ja) * 2013-01-24 2014-08-07 Mitsubishi Electric Corp 映像表示装置およびマルチ画面表示装置

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