WO2017018261A1 - 表示制御装置、および表示制御方法 - Google Patents
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- WO2017018261A1 WO2017018261A1 PCT/JP2016/071058 JP2016071058W WO2017018261A1 WO 2017018261 A1 WO2017018261 A1 WO 2017018261A1 JP 2016071058 W JP2016071058 W JP 2016071058W WO 2017018261 A1 WO2017018261 A1 WO 2017018261A1
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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
- 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]
- G09G3/3225—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] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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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
- 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]
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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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
- G09G2330/045—Protection against panel overheating
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
Definitions
- the present disclosure relates to a display control device and a display control method, and particularly, for example, in a self-light display using an OLED (organic light emitting diode), high temperature due to partial high-brightness display on a screen is suppressed.
- the present invention relates to a display control device and a display control method.
- HDR High Dynamic Range
- OLED is a semiconductor component
- the deterioration of luminance characteristics accelerates, or the amount of correction from the deterioration prediction due to temperature nonuniformity shifts and color unevenness occurs. There is a possibility. Such a problem becomes particularly prominent when the pixel signal is converted to HDR.
- ABL Automatic Bright Limiter
- the present disclosure has been made in view of such a situation, and makes it possible to suppress an increase in the surface temperature of the display device by lowering the gain value in the high luminance region.
- the display control device is the display control device that locally corrects the luminance of a video signal and supplies the video signal having the locally corrected luminance to a self-luminous display panel.
- a high-luminance area detection unit configured to set a measurement area on a signal screen, calculate an APL value of the set measurement area, and detect a high-luminance area based on a comparison result between the calculated APL value and a threshold; Based on the APL value of the high brightness area, a control unit that inputs an APL value for each pixel and generates a LUT that outputs a gain value; and an APL value for each pixel based on the pixel value of the video signal An APL value calculation unit to calculate, and an LUT that generates the LUT according to control from the control unit and outputs the gain value corresponding to the calculated APL value for each pixel by referring to the generated LUT And the output And a multiplication unit for multiplying the emission value to the pixel value of the video signal.
- the high-intensity area detection unit sets a measurement area on the screen of the video signal, calculates an APL value of the set measurement area, and the threshold value set based on the calculated APL value and actual measurement Based on the comparison result, a high luminance region can be detected.
- the high brightness area detection unit sets a measurement area on the screen of the video signal, calculates an APL value of the set measurement area, and based on a comparison result between the calculated maximum value of the APL value and the threshold value A high luminance region can be detected.
- the high-intensity area detection unit sets measurement areas having different sizes on the screen of the video signal, calculates an APL value of the set measurement area, and based on a comparison result between the calculated APL value and the threshold value A high luminance region can be detected.
- the control unit can determine a gain value that can lower the detected APL value of the high luminance region to a predetermined value, and notify the determined gain value to the LUT unit.
- the control unit determines a gain value that can lower the detected APL value of the high luminance region to a predetermined value set based on actual measurement, and the determined gain value is stored in the LUT unit. You can be notified.
- control unit When the high-luminance region of the same size is continuously detected at the same position on the screen, the control unit inputs an APL value for each pixel based on the APL value of the detected high-luminance region, and gain The non-linear LUT that outputs a value can be generated.
- the control unit can generate a linear LUT that inputs an APL value for each pixel and outputs a gain value when the high-intensity region of the same size is not continuously detected at the same position on the screen.
- the display control device may further include the self-luminous display panel.
- the display control device may further include a notification unit that notifies a user of a position where local luminance correction is performed on the video signal.
- a display control method includes a display control method for a display control apparatus that locally corrects a luminance of a video signal and supplies the video signal with the locally corrected luminance to a self-luminous display panel.
- a measurement area is set on the screen of the video signal, an APL value of the set measurement area is calculated, and a high luminance region is calculated based on a comparison result between the calculated APL value and a threshold value.
- a detection step for detecting a high luminance region a control step for generating an LUT that inputs an APL value for each pixel and outputs a gain value based on the detected APL value of the high luminance region; and a pixel of the video signal
- An APL value calculating step for calculating an APL value for each pixel based on the value, a generating step for generating the LUT, and the calculated APL value for each pixel by referring to the generated LUT Comprising an output step of outputting the serial gain value, and a multiplication step of multiplying the outputted the gain value to the pixel value of the video signal.
- a measurement area is set on a screen of a video signal, an APL value of the set measurement area is calculated, and a high luminance region is calculated based on a comparison result of the calculated APL value and a threshold value Is detected. Further, based on the detected APL value of the high brightness region, an LUT is generated that inputs an APL value for each pixel and outputs a gain value, and the APL value for each pixel is determined based on the pixel value of the video signal. By referring to the calculated and generated LUT, the gain value corresponding to the calculated APL value for each pixel is output, and the output gain value is multiplied by the pixel value of the video signal. .
- an increase in the surface temperature of the display device can be suppressed.
- FIG. 28 is a block diagram illustrating another configuration example of a display device to which the present disclosure is applied.
- the ADP function detects a high-brightness region that can be estimated as a high-temperature region on the screen, and based on the APL value of the high-brightness region, the gain value for multiplying the high-brightness pixel signal is smaller than 1 and is not a high-brightness pixel This is a function of controlling the gain value to be multiplied by the signal to be 1, thereby lowering the luminance of the high luminance region and preventing the temperature of the region from rising.
- a measurement area is provided on the screen, an APL value of the measurement area is calculated, and a high luminance area is detected based on whether or not the maximum APL value exceeds a predetermined threshold value.
- the APL value is a value obtained by an existing calculation method also used in the conventional ABL function, and can be obtained by converting the luminance into a current value and averaging it.
- the time coefficient is determined based on the characteristic of temperature rise with time when the high luminance state is maintained, and may be considered as a function such as a capacitor charging characteristic.
- FIG. 1 shows a temperature rise characteristic when time is elapsed by performing a high luminance display in the center of the self-luminous display panel.
- Curves L1, L2,... L5 in the same figure have different areas of high brightness regions, the area corresponding to the curve L1 is the largest, and the area corresponding to the curve L5 is the smallest.
- the self-luminous display panel has a higher temperature if the area of the high luminance region is larger. Further, it can be seen that the temperature rise is in an equilibrium state after a certain time from the start of the display with high luminance. However, it can also be seen that the temperature and the rate of its rise are not proportional to the area of the high luminance region.
- the temperature is not necessarily obtained by calculation using the APL value, the area coefficient, and the time coefficient.
- the area coefficient instead of the area coefficient, the temperature of high-luminance regions of various sizes is measured, and the APL value when the temperature reaches a predetermined temperature is set as a threshold value. Then, when the APL value of a measurement area of a certain size exceeds a threshold corresponding to the size, it is determined that the measurement area has reached a predetermined temperature.
- the update of the gain value for decreasing the brightness is made to correspond to the change of the APL value at intervals of several tens of seconds.
- FIG. 2 illustrates a configuration example of the display device according to the embodiment of the present disclosure.
- the display device 10 includes a luminance correction unit 11 and a self-luminous display panel 12.
- the luminance correction unit 11 adjusts the luminance of the input video signal (RGB signal) and outputs the adjusted video signal to the self-luminous display panel 12.
- the self-luminous display panel 12 is a self-luminous display device such as an OLED, for example.
- the self-luminous display panel 12 displays an image corresponding to the video signal after the luminance adjustment.
- the luminance correction unit 11 includes an ABL unit 21, a control unit 22, and an ADP unit 23.
- the ABL unit 21 corrects the luminance values of all the pixels based on the APL value of the entire screen of the video signal input from the previous stage by the ABL function that is a conventional technique, and outputs the corrected video signal to the ADP unit 23. To do.
- the ABL unit 21 may be omitted.
- the control unit 22 controls the ADP unit 23. Specifically, based on the information notified from the high-intensity region detection unit 24 of the ADP unit 23, the LUT gain value of the LUT (Look Up Table) unit 27 of the ADP unit 23 is determined to generate the LUT. The R current ratio and the B current ratio used for calculating the APL value are supplied to the APL value conversion unit 26 of the ADP unit 23.
- the ADP unit 23 is a part that realizes the above-described ADP function, and includes a high luminance region detection unit 24, a delay adjustment unit 25, an APL value conversion unit 26, an LUT unit 27, and a multiplication unit 28. These components are realized by hardware or software.
- the high brightness area detection unit 24 calculates an APL value corresponding to the measurement area while moving the measurement area on the screen for each frame of the video signal input from the previous stage, and the maximum value of the calculated APL value is the measurement area. If the threshold value corresponding to the size of is exceeded, the size and position of the measurement area and the maximum APL value are registered. Then, by repeating this series of processing multiple times with the size of the measurement area being increased stepwise, the registered measurement area position is set as a high brightness area, and the maximum APL value that exceeds the size, position, and threshold is set. The value is notified to the control unit 22. Details of detection of the high luminance area by the high luminance area detection unit 24 will be described later.
- the delay adjustment unit 25 holds the video signal input from the previous stage, and in accordance with the timing at which the gain value for multiplying each pixel value of the video signal is output from the LUT unit 27 to the multiplication unit 28, The held video signal is output to the multiplier 28.
- the APL value conversion unit 26 uses the R current ratio and the B current ratio supplied from the control unit 22 to calculate the APL value for each pixel of the video signal input from the previous stage according to the following formula and outputs the APL value to the LUT unit 27. To do.
- APL value (G + R ⁇ R current ratio + B ⁇ B current ratio) / maximum value
- the R current ratio is a current value necessary for displaying R with the same luminance when a current value necessary for displaying G is 1.
- the B current ratio is a current value necessary for displaying B with the same luminance when the current value necessary for displaying G is 1, and these are the values of the self-luminous display panel 12. It is a fixed value based on the specification.
- the LUT unit 27 generates an LUT having an input as an APL value and an output as a gain value based on the gain value notified from the control unit 22.
- the generated LUT becomes a non-linear LUT with the gain value on the high-intensity side reduced, and the high-intensity area of the same size Does not exist, or exists but is not at the same position, the gain value is linear over the entire luminance range.
- the LUT unit 27 updates the LUT at time intervals based on the control from the control unit 22. However, when updating the LUT, in order to avoid an abrupt change in the image, the value is gradually changed to the target gain value by multiplying a predetermined number of frames. Further, the LUT unit 27 outputs a gain value corresponding to the APL value of each pixel input from the APL value conversion unit 26 to the multiplication unit 28 by referring to the generated LUT.
- the multiplication unit 28 multiplies each pixel value of the video signal output from the delay adjustment unit 25 by a gain value corresponding to the APL value of each pixel input from the LUT unit 27 and outputs the result to the subsequent stage.
- FIG. 3 shows a partition unit as a movement width when moving the measurement area on the image.
- the image has a so-called 4K size (4096 ⁇ 2160 pixels).
- the whole area 31 of the image is divided into partition units 32 having substantially the same number of vertical and horizontal pixels.
- the size of the partition unit 32 is about 1% of the entire area 31.
- an intersection of frame lines assumed to divide the partition unit 32 is referred to as a partition intersection 33.
- FIG. 4 shows the measurement area set on the image.
- the measurement area 41 has four or more partition units 32 and has a square shape.
- the shape of the measurement area 41 is not limited to a square.
- the measurement area 41 represents the position by the upper left vertex coordinates, and the initial value of the position is the origin of the entire area 31 (for example, the upper left).
- the measurement area 41 is moved from the upper left to the lower right of the entire area 31 with the width of the partition unit 32 so that the upper left vertex of the measurement area 41 overlaps the partition intersection 33.
- FIG. 5 specifically shows the measurement area 41 from the minimum size to the maximum size.
- FIG. 6 shows numerical values related to the size of the measurement area 41.
- the size of the measurement area 41 is equal to or more than four of the partition units 32. Therefore, as shown in FIG. 6, the initial value of the width of the measurement area 41 is 512 pixels. When the enlargement width of the measurement area 41 is 128 pixels and the number of enlargements is five, the maximum size width of the measurement area 41 is 1152 pixels.
- the areas of the measurement areas 41 0 , 41 1 , 41 2 , 41 3 , 41 4 , 41 5 are 3%, 5%, 7%, 9% of the area of the entire region 31, respectively. 12% and 15%.
- FIG. 7 shows measured values of the surface area of the self-luminous display panel 12 and the area of the high-luminance area when the self-luminous display panel 12 displays a high-luminance area with a fixed APL value.
- the horizontal axis of the figure shows the ratio of the area of the high luminance area to the entire area 31, and the vertical axis of the figure shows the surface temperature of the self-luminous display panel 12.
- a curve L11 in the figure corresponds to the case where the APL value is fixed to a maximum value
- the curve L12 corresponds to a case where the APL value is fixed to a value smaller than the maximum value. .
- the surface temperature of the self light emitting display panel 12 is lower than 60 ° C. (for example, 55 ° C. ),
- the intersection of the horizontal dotted line and the vertical dotted line size 0 to 5 in the figure is specified, and a fixed APL value corresponding to curves L11, L12, etc. (including those not shown) passing through the specified intersections
- the threshold for each size of the measurement area 41 may be set. That is, the threshold value for each size of the measurement area 41 is set in advance in the high luminance area detection unit 24 based on the actual measurement value.
- the control unit 22 determines a value notified from the high luminance region detection unit 24 so that the maximum value of the APL value exceeding the threshold value is equal to or less than the threshold value (APL value). Notify Therefore, the gain value is changed according to the input video signal.
- the LUT does not need to be updated sequentially, and may be updated at intervals of several tens of seconds. Also, in order to avoid a sudden change in the displayed image, the gain value is not changed from 1 to the target value immediately, but the gain value is interpolated in units of frames over a time corresponding to a predetermined number of frames. And gradually change it to the target value.
- FIG. 8 illustrates an example of the LUT generated by the LUT unit 27 based on the gain value notified from the control unit 22.
- the horizontal axis indicates the APL value (in the case of 10 bits) as the input of the LUT
- the vertical axis indicates the gain value as the output of the LUT.
- FIG. 9 shows the relationship between the input (pixel value before luminance correction) and the output (pixel value after luminance correction) of the multiplier 28 when the LUT of FIG. 8 is applied.
- a curve L21 shown in FIG. 8 is a linear LUT that is applied when there is no need to suppress high luminance and that has a constant gain value (1 in the case of FIG. 8) over the entire range of APL values to be input.
- the input and output of the multiplication unit 28 are a curve L31 shown in FIG.
- a curve L23 shown in FIG. 8 is a non-linear LUT in which the gain value is lowered in the high range of the input APL value, which is applied when high luminance is suppressed, and multiplication in the case where this LUT is applied.
- the input and output of the unit 28 is a curve L33 shown in FIG.
- the LUT unit 27 interpolates the gain value in units of frames over a time corresponding to a predetermined number of frames, and becomes a target through generation and application of the LUT corresponding to the curve L22 shown in FIG. A nonlinear LUT indicated by the curve L23 is generated and applied.
- FIG. 10 is a flowchart for explaining the high brightness area detection process.
- This high luminance area detection process is repeatedly executed with each frame of the video signal (RGB signal) input from the previous stage to the high luminance area detection unit 24 as a processing target.
- step S1 the high-intensity area detection unit 24 sets the size of the measurement area 41 to be moved on the screen of the video signal input from the previous stage to the size 0 which is the minimum size.
- step S2 the high brightness area detection unit 24 initializes the position of the measurement area 41.
- step S ⁇ b> 3 the high brightness area detection unit 24 calculates and stores the APL value of the current measurement area 41.
- step S4 the high brightness area detection unit 24 determines whether or not the measurement area 41 has been moved to the entire area 31 of the frame to be processed. If an area that is not the measurement area 41 remains, and the determination result is negative, the process proceeds to step S5. In step S ⁇ b> 5, the high brightness area detection unit 24 moves the position of the measurement area 41 by the partition unit 32. Thereafter, the process is returned to step S3, and steps S3 to S5 are repeated.
- step S4 If the determination result in step S4 is affirmative because the measurement area 41 has been moved to the entire region 31 of the frame to be processed, the process proceeds to step S6.
- step S ⁇ b> 6 the high luminance area detection unit 24 sets the maximum value of the APL value calculated from each moved measurement area 41 to the measurement area 41 of the current size (in this case, size 0) that is set in advance. It is determined whether or not the corresponding threshold is exceeded. If the determination result is affirmative, a high-luminance area that is equal to or larger than the size of the measurement area 41 exists on the screen, and the process proceeds to step S7.
- step S7 the high luminance area detection unit 24 registers (stores) the size and position of the measurement area 41 where the maximum value of the APL value is calculated, and the maximum value of the APL value exceeding the threshold value.
- step S6 when the determination result of step S6 is negative (when the maximum value of the APL value does not exceed the threshold value), there is no high-luminance region on the screen that is equal to or larger than the size of the measurement area 41.
- step S7 is skipped.
- step S8 the high brightness area detection unit 24 determines whether or not the current measurement area 41 is the maximum size (size 5). If this determination result is negative, the process proceeds to step S9. In step S ⁇ b> 9, the high brightness area detection unit 24 enlarges the size of the measurement area 41 by one step. Thereafter, the process returns to step S2, and steps S2 to S9 are repeated.
- step S7 while steps S2 to S9 are repeated, registration is performed when the position and size of the measurement area 41 to be registered include the position of the measurement area 41 of a smaller size that has already been registered. Overwrite existing ones and register them. As a result, the size, position, and size of the measurement area 41 corresponding to the high luminance region occupying the largest area on the frame, and the maximum value of the APL value exceeding the threshold value are registered.
- the size, position, and size of the measurement area 41 corresponding to the high luminance area occupying the largest area on the frame, and the maximum value of the APL value exceeding the threshold value are collectively referred to as high luminance area information.
- step S8 If the determination result in step S8 is affirmative because the measurement area 41 has been expanded to the maximum size (size 5), the process proceeds to step S10.
- step S10 the high brightness area detection unit 24 notifies the control unit 22 of the registered high brightness area information. If there is no registered high-luminance area information, that is, if no high-luminance area is detected from the currently processed frame, the process of step S10 is omitted.
- the high-intensity area detection unit 24 deletes the registered data and ends the high-intensity area detection process for the frame currently being processed.
- the high-luminance area detection unit 24 can notify the control unit 22 of the high-luminance area information when a high-luminance area is detected for each frame.
- FIG. 11 is a flowchart for explaining the LUT generation control process.
- step S21 the control unit 22 stands by until the high luminance region information is notified from the high luminance region detection unit 24.
- the process proceeds to step S22.
- step S22 the control unit 22 determines whether or not the same high-intensity area information is notified for a predetermined time (or a predetermined number of frames) continuously.
- step S22 If the determination result in step S22 is negative, a high-luminance area exists on the screen, but the high-luminance area moves on the screen or changes its size. There is no possibility of increasing the temperature. Therefore, in this case, the luminance in the high luminance region is not suppressed. Specifically, the process proceeds to step S23, and the control unit 22 causes the LUT unit 27 to generate a linear LUT.
- step S22 determines whether the high luminance area is continuously displayed on the screen without moving, and the surface temperature of the self-luminous display panel 12 may be increased. It is thought that there is sex. Therefore, in this case, the luminance of the high luminance region is suppressed.
- the process proceeds to step S24, and the control unit 22 specifies a gain value that lowers the maximum value of the APL value included in the high luminance region information to the APL value corresponding to the target temperature, and sets the LUT unit. 27 to generate a non-linear LUT. In accordance with this control, the LUT unit 27 generates an LUT. Thereafter, the process returns to step S21, and the subsequent steps are repeated.
- FIG. 12 is a flowchart for explaining the luminance correction processing. This luminance correction process is repeatedly executed on each frame of the video signal (RGB signal) input from the previous stage to the luminance correction unit 11 as a processing target.
- step S31 the APL value conversion unit 26 calculates an APL value for each pixel of each frame of the video signal input from the previous stage, and outputs the APL value to the LUT unit 27.
- step S ⁇ b> 32 the LUT unit 27 refers to the generated LUT and outputs a gain value corresponding to the APL value of each pixel input from the APL value conversion unit 26 to the multiplication unit 28.
- step S33 the multiplication unit 28 multiplies each pixel value of the video signal output from the delay adjustment unit 25 by the gain value corresponding to the APL value of each pixel input from the LUT unit 27, and outputs the result to the subsequent stage. To do. Thus, the luminance correction process for one frame of the video signal is completed.
- the luminance of only the high luminance area that can increase the surface temperature of the self-luminous display panel 12 is suppressed. can do. Therefore, an increase in the surface temperature of the self-luminous display panel 12 can be suppressed, and deterioration of luminance characteristics, which may occur when a local high temperature state continues in the self-luminous display panel 12, is accelerated, or temperature is not uniform. It is possible to suppress the occurrence of a situation in which color correction occurs due to a shift in the correction amount from the deterioration prediction due to conversion.
- the measurement area 41 is sequentially changed from size 0 to size 5 for each frame regardless of the size of the high brightness area detected in the previous frame. In this case, if the time required for one size of the measurement area 41 is T seconds, 6 T seconds are required for each frame.
- Modification 1 for example, when a high-luminance region of size 3 is detected in a certain frame, in subsequent frames, size 0, size 3, size 1, size 3, and size 3 with reference to size 3 of measurement area 41 The size is changed in the order of size 2, size 3, size 4, size 3, size 5, size 3. In this way, by changing the size of the measurement area 41, it is possible to confirm whether the high-luminance region of size 3 exists at the same position at intervals of 2T seconds.
- the time required for the processing of steps S21 and S22 of the LUT generation control processing can be shortened. For example, when the high-luminance area disappears from the screen, the linear LUT can be quickly changed. Can be returned.
- Modification 2 when a high-luminance area of size 3, for example, is detected in a certain frame, the size of the measurement area 41 is changed in parallel with executing the high-luminance area detection process in subsequent frames.
- the high-luminance area detection process is executed without fixing the size of the measurement area 41 and without increasing the size of the measurement area 41.
- the time required for the processes of steps S21 and S22 of the LUT generation control process can be shortened.
- FIG. 13 is a diagram for explaining a coping method for a 4K compatible video signal.
- the video signal is composed of a series of pixel signals of the entire frame.
- the 4K compatible video signal is divided into vertically long strip-shaped areas LL, LR, RL, and RR, and is configured as four data. By processing these four pieces of data in parallel, a 4K screen is displayed.
- a DE (Data Enable) signal may be output as shown.
- FIG. 14 shows an example of the shape of the measurement area 41.
- the shape of the measurement area 41 is a square as shown in FIG. A.
- the measurement area 41 is circular as shown in FIG. It is good.
- the shape of the measurement area 41 is a circle, a reduction in detection error in a high luminance region can be expected as compared to a square shape.
- FIG. 15 illustrates another configuration example of the display device 10 according to the embodiment of the present disclosure.
- the luminance correction notification unit 61 has a function of notifying the user of the position when the luminance correction unit 11 performs luminance correction on a high luminance area on the screen.
- the user can grasp whether or not the image displayed on the self-luminous display panel 12 is subjected to local brightness correction.
- the position can be easily confirmed.
- local luminance correction by the luminance correction unit 11 may be stopped according to an instruction from a user who has confirmed that local luminance correction has been performed.
- the display device 10 can be applied to, for example, a television receiver that displays video content such as a television program.
- a television receiver that displays video content
- video content such as a television program.
- a broadcast that produces or edits video content. It is suitable for a commercial video monitor used in a station or the like.
- the present disclosure can be configured as follows.
- a high-luminance area detector configured to set a measurement area on the screen of the video signal, calculate an APL value of the set measurement area, and detect a high-luminance area based on a comparison result between the calculated APL value and a threshold; , Based on the detected APL value of the high luminance region, a control unit that generates an LUT that inputs an APL value for each pixel and outputs a gain value; An APL value calculation unit for calculating an APL value for each pixel based on a pixel value of the video signal; A LUT unit that generates the LUT according to control from the control unit and outputs the gain value corresponding to the calculated APL value for each pixel by referring to the generated LUT;
- a display control device comprising: a multiplication unit that multiplies the pixel value of the video signal by the output
- the high-intensity area detection unit sets a measurement area on the screen of the video signal, calculates an APL value of the set measurement area, and the threshold value set based on the calculated APL value and actual measurement
- the display control apparatus according to (1), wherein a high-luminance region is detected based on a comparison result of (3)
- the high brightness area detection unit sets a measurement area on the screen of the video signal, calculates an APL value of the set measurement area, and based on a comparison result between the calculated maximum value of the APL value and the threshold value
- the display control device according to (1) or (2), wherein the display control device detects a high-luminance region.
- the high-intensity area detection unit sets measurement areas having different sizes on the screen of the video signal, calculates an APL value of the set measurement area, and based on a comparison result between the calculated APL value and the threshold value
- the display control device according to any one of (1) to (3), wherein a high-luminance region is detected.
- the control unit determines a gain value that can lower the detected APL value of the high luminance region to a predetermined value, and notifies the determined gain value to the LUT unit (1) to (4 The display control device according to any one of the above.
- the control unit determines a gain value that can lower the detected APL value of the high luminance region to a predetermined value set based on actual measurement, and the determined gain value is stored in the LUT unit.
- the display control device according to (5).
- the control unit inputs an APL value for each pixel based on the APL value of the detected high-luminance region, and gain
- the display control device according to any one of (1) to (6), wherein the nonlinear LUT that outputs a value is generated.
- the control unit generates a linear LUT that inputs an APL value for each pixel and outputs a gain value when the high-luminance region of the same size is not continuously detected at the same position on the screen.
- the display control apparatus according to any one of (1) to (8), further including the self-luminous display panel.
- a high luminance region detection step for setting a measurement area on the screen of the video signal, calculating an APL value of the set measurement area, and detecting a high luminance region based on a comparison result between the calculated APL value and a threshold; , Based on the detected APL value of the high brightness region, a control step for generating an LUT that inputs an APL value for each pixel and outputs a gain value; An APL value calculating step for calculating an APL value for each pixel based on a pixel value of the video signal; Generating step for generating the LUT; An output step of outputting the gain value corresponding to the calculated
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Abstract
Description
はじめに、本開示の実施の形態である表示装置に採用するADP機能について説明する。
温度∝APL値×面積係数×時間係数
次に、図2は、本開示の実施の形態である表示装置の構成例を示している。
APL値=(G+R×R電流比+B×B電流比)/最大値
次に、高輝度領域検出部24による高輝度領域検出処理について図3乃至図6を参照して説明する。
次に、APL値と比較する測定エリア41のサイズ毎に異なる閾値と、制御部22からLUT部27に通知するLUTの出力となるゲイン値の設定について説明する。
次に、図8は、制御部22から通知されるゲイン値に基づいてLUT部27で生成されるLUTの例を示している。同図において横軸はLUTの入力となるAPL値(10ビットの場合)、縦軸はLUTの出力となるゲイン値を示している。図9は、図8のLUTが適用された場合における、乗算部28の入力(輝度補正前の画素値)と、出力(輝度補正後の画素値)の関係を示している。
次に、表示装置10の動作について説明する。ただし、ABL部21における動作説明は省略する。
上述した高輝度領域検出処理では、前フレームで検出された高輝度領域のサイズに拘わらず、フレーム毎に測定エリア41をサイズ0からサイズ5まで順に変化させていた。この場合、測定エリア41の1種類のサイズに対して要する時間がT秒間であれば、フレーム毎に6T秒間を要することになる。
次に、図13は4K対応のビデオ信号に対する対処方法を説明するための図である。
図14は、測定エリア41の形状の例を示している。上述した実施の形態では、測定エリア41の形状を、同図Aに示されるように正方形としたが、自発光表示パネル12の温度放熱特性を考慮して、同図Bに示されるように円形としてもよい。測定エリア41の形状を円形とした場合、正方形とした場合に比較して、高輝度領域の検出誤差の低減が期待できる。
次に、図15は、本開示の実施の形態である表示装置10の他の構成例を示している。
本開示の実施の形態である表示装置10は、例えば、テレビジョン番組などの映像コンテンツを表示するテレビジョン受像機に適用できる他、特に、例えば、映像コンテンツを制作したり、編集したりする放送局などで使用される業務用のビデオモニタに好適である。
(1)
ビデオ信号に対して局所的に輝度を補正し、局所的に輝度を補正した前記ビデオ信号を自発光表示パネルに供給する表示制御装置において、
前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と閾値の比較結果に基づいて高輝度領域を検出する高輝度領域検出部と、
検出された前記高輝度領域の前記APL値に基づき、画素毎のAPL値を入力、ゲイン値を出力とするLUTを生成させる制御部と、
前記ビデオ信号の画素値に基づいて画素毎のAPL値を算出するAPL値算出部と、
前記制御部からの制御に従って前記LUTを生成し、生成した前記LUTを参照することにより、算出された前記画素毎のAPL値に対応する前記ゲイン値を出力するLUT部と、
出力された前記ゲイン値を前記ビデオ信号の画素値に乗算する乗算部と
を備える表示制御装置。
(2)
前記高輝度領域検出部は、前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と、実測に基づいて設定されている前記閾値の比較結果に基づいて高輝度領域を検出する
前記(1)に記載の表示制御装置。
(3)
前記高輝度領域検出部は、前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値の最大値と前記閾値の比較結果に基づいて高輝度領域を検出する
前記(1)または(2)に記載の表示制御装置。
(4)
前記高輝度領域検出部は、前記ビデオ信号の画面上にサイズの異なる測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と前記閾値の比較結果に基づいて高輝度領域を検出する
前記(1)から(3)のいずれかに記載の表示制御装置。
(5)
前記制御部は、検出された前記高輝度領域の前記APL値を所定の値まで下げることができるゲイン値を決定し、決定した前記ゲイン値を前記LUT部に通知する
前記(1)から(4)のいずれかに記載の表示制御装置。
(6)
前記制御部は、検出された前記高輝度領域の前記APL値を、実測に基づいて設定されている所定の値まで下げることができるゲイン値を決定し、決定した前記ゲイン値を前記LUT部に通知する
前記(5)に記載の表示制御装置。
(7)
前記制御部は、画面上の同じ位置に同じサイズの前記高輝度領域が継続して検出された場合、検出された前記高輝度領域の前記APL値に基づき、画素毎のAPL値を入力、ゲイン値を出力とする非線形の前記LUTを生成させる
前記(1)から(6)のいずれかに記載の表示制御装置。
(8)
前記制御部は、画面上の同じ位置に同じサイズの前記高輝度領域が継続して検出されない場合、画素毎のAPL値を入力、ゲイン値を出力とする線形のLUTを生成させる
前記(1)から(7)のいずれかに記載の表示制御装置。
(9)
前記自発光表示パネルをさらに備える
前記(1)から(8)のいずれかに記載の表示制御装置。
(10)
前記ビデオ信号に対して局所的な輝度補正が行われている位置をユーザに通知する通知部をさらに備える
前記(1)から(9)のいずれかに記載の表示制御装置。
(11)
ビデオ信号に対して局所的に輝度を補正し、局所的に輝度を補正した前記ビデオ信号を自発光表示パネルに供給する表示制御装置の表示制御方法において、
前記表示制御装置による、
前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と閾値の比較結果に基づいて高輝度領域を検出する高輝度領域検出ステップと、
検出された前記高輝度領域の前記APL値に基づき、画素毎のAPL値を入力、ゲイン値を出力とするLUTを生成させる制御ステップと、
前記ビデオ信号の画素値に基づいて画素毎のAPL値を算出するAPL値算出ステップと、
前記LUTを生成する生成ステップと、
生成された前記LUTを参照することにより、算出された前記画素毎のAPL値に対応する前記ゲイン値を出力する出力ステップと、
出力された前記ゲイン値を前記ビデオ信号の画素値に乗算する乗算ステップと
を含む表示制御方法。
Claims (11)
- ビデオ信号に対して局所的に輝度を補正し、局所的に輝度を補正した前記ビデオ信号を自発光表示パネルに供給する表示制御装置において、
前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と閾値の比較結果に基づいて高輝度領域を検出する高輝度領域検出部と、
検出された前記高輝度領域の前記APL値に基づき、画素毎のAPL値を入力、ゲイン値を出力とするLUTを生成させる制御部と、
前記ビデオ信号の画素値に基づいて画素毎のAPL値を算出するAPL値算出部と、
前記制御部からの制御に従って前記LUTを生成し、生成した前記LUTを参照することにより、算出された前記画素毎のAPL値に対応する前記ゲイン値を出力するLUT部と、
出力された前記ゲイン値を前記ビデオ信号の画素値に乗算する乗算部と
を備える表示制御装置。 - 前記高輝度領域検出部は、前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と、実測に基づいて設定されている前記閾値の比較結果に基づいて高輝度領域を検出する
請求項1に記載の表示制御装置。 - 前記高輝度領域検出部は、前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値の最大値と前記閾値の比較結果に基づいて高輝度領域を検出する
請求項2に記載の表示制御装置。 - 前記高輝度領域検出部は、前記ビデオ信号の画面上にサイズの異なる測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と前記閾値の比較結果に基づいて高輝度領域を検出する
請求項2に記載の表示制御装置。 - 前記制御部は、検出された前記高輝度領域の前記APL値を所定の値まで下げることができるゲイン値を決定し、決定した前記ゲイン値を前記LUT部に通知する
請求項2に記載の表示制御装置。 - 前記制御部は、検出された前記高輝度領域の前記APL値を、実測に基づいて設定されている所定の値まで下げることができるゲイン値を決定し、決定した前記ゲイン値を前記LUT部に通知する
請求項5に記載の表示制御装置。 - 前記制御部は、画面上の同じ位置に同じサイズの前記高輝度領域が継続して検出された場合、検出された前記高輝度領域の前記APL値に基づき、画素毎のAPL値を入力、ゲイン値を出力とする非線形の前記LUTを生成させる
請求項2に記載の表示制御装置。 - 前記制御部は、画面上の同じ位置に同じサイズの前記高輝度領域が継続して検出されない場合、画素毎のAPL値を入力、ゲイン値を出力とする線形のLUTを生成させる
請求項7に記載の表示制御装置。 - 前記自発光表示パネルをさらに
備える請求項2に記載の表示制御装置。 - 前記ビデオ信号に対して局所的な輝度補正が行われている位置をユーザに通知する通知部をさらに備える
請求項2に記載の表示制御装置。 - ビデオ信号に対して局所的に輝度を補正し、局所的に輝度を補正した前記ビデオ信号を自発光表示パネルに供給する表示制御装置の表示制御方法において、
前記表示制御装置による、
前記ビデオ信号の画面上に測定エリアを設定し、設定した前記測定エリアのAPL値を算出し、算出した前記APL値と閾値の比較結果に基づいて高輝度領域を検出する高輝度領域検出ステップと、
検出された前記高輝度領域の前記APL値に基づき、画素毎のAPL値を入力、ゲイン値を出力とするLUTを生成させる制御ステップと、
前記ビデオ信号の画素値に基づいて画素毎のAPL値を算出するAPL値算出ステップと、
前記LUTを生成する生成ステップと、
生成された前記LUTを参照することにより、算出された前記画素毎のAPL値に対応する前記ゲイン値を出力する出力ステップと、
出力された前記ゲイン値を前記ビデオ信号の画素値に乗算する乗算ステップと
を含む表示制御方法。
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US10504456B2 (en) | 2019-12-10 |
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JP6777080B2 (ja) | 2020-10-28 |
JPWO2017018261A1 (ja) | 2018-05-17 |
CN107851417B (zh) | 2021-06-11 |
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