WO2012137759A1 - 表示装置、及び、輝度制御信号の生成方法 - Google Patents
表示装置、及び、輝度制御信号の生成方法 Download PDFInfo
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- WO2012137759A1 WO2012137759A1 PCT/JP2012/059039 JP2012059039W WO2012137759A1 WO 2012137759 A1 WO2012137759 A1 WO 2012137759A1 JP 2012059039 W JP2012059039 W JP 2012059039W WO 2012137759 A1 WO2012137759 A1 WO 2012137759A1
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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
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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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
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0428—Gradation resolution change
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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
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
-
- 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
Definitions
- the present invention relates to display device, and more particularly, to backlight brightness control.
- brightness control of the backlight in the display device is performed.
- LABC Light Adaptive Backlight Control
- CABC Content Adaptive Backlight Control
- the LABC controls the luminance of the backlight according to the illuminance around the display device, as described in Patent Document 1 below.
- lighting / extinguishing of the backlight is controlled according to the illuminance level detected by the illuminance sensor.
- CABC controls the luminance of the backlight according to the displayed image, for example.
- the backlight brightness control may cause a problem when there are a plurality of factors to be considered in determining the brightness control factor, that is, the optimum brightness.
- FIG. 10 shows a conventional technique and is a block diagram showing an outline of luminance control.
- the display device 10 includes a BL (backlight: the same applies hereinafter) control block A110, a BL control block B120, a control signal synthesis unit 130, a BL unit control unit 140, and a backlight.
- a unit 150 is provided.
- the BL control block A110 and the BL control block B120 are connected to the control signal synthesis unit 130.
- a PWM (Pulse Width Modulation) signal A is input from the BL control block A110 to the control signal synthesis unit 130, and a PWM signal B is input from the BL control block B120 to the control signal synthesis unit 130.
- the control signal synthesis unit 130 synthesizes the PWM signal A ⁇ B by superimposing the input PWM signal A and the PWM signal B.
- the PWM signal A ⁇ B is input from the control signal synthesis unit 130 to the BL unit control unit 140 connected to the control signal synthesis unit 130.
- the BL unit controller 140 controls the luminance of the backlight unit 150 connected to the BL unit controller 140 based on the input PWM signal A ⁇ B.
- FIG. 11 shows a conventional technique and is a waveform diagram showing an outline of PWM signal superposition.
- the PWM signal A and the PWM signal B indicate two PWM signals whose phases are shifted by a half cycle, and the PWM signal A ⁇ B includes the PWM signal A and the PWM signal B.
- the superimposed PWM signal (duty: 0%) is shown.
- an object of the present invention is to provide a display device capable of appropriate brightness control when controlling the brightness of a backlight based on a plurality of factors. There is.
- the display device of the present invention provides A display device provided with a signal generation unit that generates a luminance control signal for controlling the luminance of a backlight, A plurality of parameters related to the brightness of the backlight are input to the signal generation unit, The signal generation unit performs a calculation process on the plurality of input parameters, and generates the luminance control signal based on a result of the calculation process.
- the luminance control signal generation method of the present invention provides A method of generating a brightness control signal for controlling the brightness of a backlight, A plurality of parameters relating to the luminance are previously calculated and a signal for controlling the luminance is generated based on the calculation result.
- a plurality of parameters relating to the brightness of the backlight are processed and a brightness control signal is generated based on the result. To do.
- the luminance control signal is not a desired signal, such as the duty in the PWM signal disappears, and problems such as the backlight turning off hardly occur.
- a plurality of parameters relating to the luminance of the backlight are input to the signal generation unit, and the signal generation unit performs arithmetic processing on the plurality of input parameters.
- a luminance control signal is generated based on the result of the arithmetic processing.
- the luminance control signal generation method of the present invention is a method for generating a signal for controlling the luminance based on the calculation result by previously calculating a plurality of luminance parameters as described above. is there.
- FIG. 1 showing an embodiment of the present invention, is a block diagram illustrating a schematic configuration of a display device.
- FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, showing an embodiment of the present invention, is a block diagram showing an outline of luminance control.
- the embodiment of the present invention is shown and is a diagram illustrating an example of parameter calculation.
- the embodiment of the present invention is shown and is a diagram illustrating another example of calculation of parameters.
- FIG. FIG. 5 is a diagram illustrating an embodiment of the present invention and illustrating a comparison table of luminance levels and duty ratios.
- FIG. 11 is a block diagram illustrating an outline of another luminance control according to an embodiment of the present invention.
- the embodiment of the present invention is shown and is a diagram illustrating another example of calculation of parameters.
- the other embodiment of this invention is shown and it is a block diagram which shows schematic structure of a display apparatus.
- the other embodiment of this invention is shown and it is a block diagram which shows schematic structure of a display apparatus.
- FIG. 1 is a block diagram illustrating a schematic configuration of the display device 10.
- the display device 10 mainly includes a timing control unit 40, a scanning line driving circuit 22, a signal line driving circuit 24, a display panel 20, a backlight unit 30, and a BL (Back Light, A backlight) unit controller 32 is provided.
- the scanning line driving circuit 22 and the signal line driving circuit 24 are circuits for outputting signals for image display to the display panel 20.
- the backlight unit (backlight) 30 irradiates the display panel 20 with light from the back, and the brightness and the like of the backlight unit 30 are controlled by the BL unit controller 32.
- Timing control part Next, the timing control unit 40 will be described.
- the timing control unit 40 of the present embodiment mainly includes a timing generation block 42, a CABC (Content Adaptive Backlight Control) block 50, a BL luminance control signal generation block 44 as a signal generation unit, and a LABC (Light Adaptive Backlight).
- a Control) block 70 is provided.
- Timing generation block 42 is a block that generates a scanning line driving circuit control signal and a signal line driving circuit control signal based on the input vertical / horizontal synchronization signal.
- a system side control unit 90 is connected to the timing generation block 42, and a vertical / horizontal synchronization signal output from the system side control unit 90 is input.
- the timing generation block 42 generates a scanning line drive circuit control signal and a signal line drive circuit control signal based on the input signals.
- the generated scanning line driving circuit control signal is input to the scanning line driving circuit 22 connected to the timing generation block 42.
- the generated signal line drive circuit control signal is input to the signal line drive circuit 24 connected to the timing generation block 42.
- CABC block The CABC (Content Adaptive Backlight Control) block 50 is a block that converts the gradation of an input image signal in accordance with the brightness of the input image and the like and outputs it to the signal line drive circuit 24 as an output image signal. In addition, the CABC block 50 calculates a parameter for controlling the luminance of the backlight unit 30 in accordance with the input image signal.
- the CABC block 50 is provided with an image analysis unit 52, a gradation conversion unit 54, a gradation characteristic determination unit 56, and a BL control parameter calculation unit 58.
- the vertical / horizontal synchronization signal and the input image signal output from the system-side control unit 90 are input to the CABC block 50. Specifically, the input image signal is input to the gradation conversion unit 54 and the image analysis unit 52.
- the input image signal is displayed without being subjected to special processing
- the input image signal is input to the gradation conversion unit 54, and after being subjected to gradation conversion as necessary, the output image is output.
- the signal is output to the signal line drive circuit 24 as a signal.
- the output image signal is created after performing image processing such as shifting the gradation value of the input image signal
- the input image signal is input to the image analysis unit 52.
- the gradation characteristic determination unit 56 determines the content of the image processing.
- the gradation conversion unit 54 creates an output image signal based on the determination by the gradation characteristic determination unit 56 and outputs the output image signal to the signal line driving circuit 24.
- a suitable luminance of the backlight unit 30 is determined according to the result of image analysis by the image analysis unit 52. Specifically, the image analysis result is output from the image analysis unit 52 to the BL control parameter calculation unit 58, and the BL control parameter calculation unit 58 calculates a BL control parameter for controlling the luminance of the backlight. Is done. The calculated BL control parameter is output to the BL brightness control signal generation block 44.
- the luminance of the backlight unit 30 is increased in order to display the image more clearly.
- the luminance of the backlight unit 30 is lowered in order to make black more black and increase the contrast.
- the processing when the input image is a dark image there is processing when the input image is a dark image.
- the gradation value of the image is shifted upward.
- the luminance of the backlight is shifted downward.
- the LABC block 70 is a block that determines a suitable luminance of the backlight unit 30 in accordance with the environmental illuminance of the display device 10, for example, the brightness of the surroundings.
- the LABC block 70 is provided with a filter unit 72 and a BL control parameter calculation unit 74.
- An illuminance detection unit 94 is connected to the filter unit 72.
- the illuminance detection unit 94 measures the brightness around the display device 10. Then, the measured brightness is output to the filter unit 72 as an illuminance information signal.
- the filter unit 72 removes the noise component of the illuminance information signal and converts it to a more stable illuminance information signal.
- the BL control parameter calculation unit 74 determines a suitable brightness of the backlight unit 30 based on the illuminance information signal received from the filter unit 72, and calculates a BL control parameter.
- the BL control parameter is output from the BL control parameter calculation unit 74 to the BL luminance control signal generation block 44.
- the position where the illuminance detection unit 94 is provided is not particularly limited, and may be provided in the display device 10 or separately from the display device 10, for example.
- the luminance of the backlight unit 30 is increased to suppress the deterioration of display quality due to the reflection of ambient light.
- the luminance of the backlight unit 30 can be lowered to prevent the display from becoming too dazzling.
- the RGBW block 80 is a block for converting the output image signal of RGB (Red, Green, Blue) three colors into an image signal of RGBW (Red, Green, Blue, White) four colors. Further, a suitable luminance of the backlight unit 30 is calculated according to the brightness of the W pixel.
- the position where the RGBW block 80 is provided is not particularly limited, but is provided in the signal line driving circuit 24 in the present embodiment.
- the RGBW block 80 includes an RGB data converter 82, an expansion coefficient calculator 84, and a BL control parameter calculator 86.
- the output image signal from the gradation conversion unit 54 described above is input to the RGB data conversion unit 82.
- the RGB data conversion unit 82 converts RGB image signals into RGBW image signals.
- the expansion coefficient calculation unit 84 connected to the RGB data conversion unit 82 calculates the luminance of the W pixel.
- the RGBW four-color output image signals converted by the RGBW block 80 are output to the display panel 20.
- the expansion coefficient calculation unit 84 outputs information on the luminance of the W pixel to the BL control parameter calculation unit 86.
- the BL control parameter calculation unit 86 calculates a BL control parameter based on the information regarding the luminance of the W pixel.
- the BL control parameter is output from the BL control parameter calculation unit 86 to the BL luminance control signal generation block 44.
- luminance control of the backlight unit 30 in the RGBW block 80 will be described.
- the luminance of the W pixel is high, the luminance of the backlight unit 30 is lowered to reduce power consumption.
- the color of the increasing pixel is not limited to W.
- various colors such as yellow and green can be used.
- the BL control parameter calculation unit 86 calculates the BL control parameter from the viewpoint of making display brightness appropriate, as in the case where the color of the increasing pixel is W.
- the user input unit 92 is a part where the user of the display device 10 inputs an arbitrary brightness setting for the brightness of the display image and the brightness of the backlight unit 30.
- the user input unit 92 calculates a BL control parameter.
- the calculated BL control parameter is input to the BL brightness control signal generation block 44.
- the position where the user input unit 92 is provided is not particularly limited.
- the user input unit 92 may be provided on the display device 10 or separately from the display device 10.
- the BL brightness control signal generation block 44 is a block that generates a BL brightness control signal (brightness control signal) and inputs the BL brightness control signal to the BL unit control unit 32.
- the BL brightness control signal generation block 44 is provided in the timing control unit 40.
- the position where the BL brightness control signal generation block 44 is provided is not particularly limited, and may be provided in the display device 10 separately from the timing control unit 40, for example.
- a plurality of BL control parameters are input to the BL brightness control signal generation block 44. That is, a BL control parameter based on CABC is input from the BL control parameter calculation unit 58 of the CABC block 50, and similarly, a BL control parameter based on LABC is input from the BL control parameter calculation unit 74 of the LABC block 70 to the RGBW block. 80 BL control parameter calculation unit 86 receives RGB control parameters by RGBW, and user input unit 92 receives BL control parameters by the user.
- the type and number of BL control parameters input to the BL brightness control signal generation block 44 are not particularly limited, and at least a plurality of BL control parameters may be input.
- the plurality of input BL control parameters are processed in advance, and the BL brightness control signal is generated based on the obtained parameters.
- the control signals are not processed, but the control-related parameters are processed, and then the control signals are generated based on the parameters obtained by the processing. Is generated.
- description will be given based on the drawings.
- FIG. 2 is a block diagram illustrating an outline of luminance control in the display device 10 according to the embodiment.
- FIG. 2 shows a case where the number of parameters (parameters related to backlight luminance) input to the BL luminance control signal generation block 44 is two for the sake of simplicity.
- the BL brightness control signal generation block 44 is connected to a BL control block A45 and a BL control block B46.
- the BL control block A45 and the BL control block B46 correspond to, for example, the LABC block 70 and the CABC block 50, respectively.
- parameters (parameters A and B) related to the brightness control of the backlight unit 30 are input to the BL brightness control signal generation block 44 instead of the BL brightness control signal.
- the BL brightness control signal generation block 44 calculates the parameters and then generates a BL brightness control signal based on the calculation processing result.
- FIG. 3 is a diagram illustrating an example of calculating parameters in the present embodiment.
- the parameter A is a duty ratio of 70/100
- the parameter B is a duty ratio of 30/100.
- a PWM signal as a BL brightness control signal is generated.
- the BL brightness control signal generation block 44 generates a PWM signal having a duty of 21% and outputs the PWM signal to the BL unit control unit 32.
- FIG. 4 is a diagram illustrating another calculation example of parameters in the present embodiment.
- the input parameter (BL control parameter) is the duty ratio
- the input parameter (BL control parameter) is the luminance level. Is different.
- the parameter A is a luminance level of 12/16
- the parameter B is a luminance level of 4/8.
- FIG. 5 is a diagram illustrating a comparison table between the luminance level and the duty ratio.
- the duty ratio is set to 55 with reference to the comparison table shown in FIG.
- the BL brightness control signal generation block 44 generates a 55% duty PWM signal as a BL brightness control signal and outputs the BL brightness control signal to the BL unit controller 32.
- the BL control parameter is the duty ratio and the case where it is the luminance level are exemplified.
- the types of BL control parameters are not limited to the above examples.
- the PWM signal is exemplified as the BL brightness control signal.
- the type of the BL luminance control signal is not limited to the above example, and may be an analog voltage signal or digital data, for example.
- the BL unit control unit 32 receives the digital data through an I / F such as SPI or I2C, and controls the luminance of the backlight unit 30.
- multiplication is exemplified as the arithmetic processing of the BL luminance control signal generation block 44.
- the type of arithmetic processing is not limited to the above example, and for example, addition, average, and combination table can be used.
- the use of the above combination table means that, for example, when the value of parameter A is 0 and the value of parameter B is 1, a table corresponding to the number of parameter combinations is prepared in advance, such as 25% PWM duty. It means that a BL brightness control signal is created based on the table.
- arithmetic processing is not limited to a kind, and several kinds of arithmetic can be combined.
- arithmetic mean value calculation arithmetic mean value calculation, weighted average value calculation (average value weighted with parameters), maximum value extraction, minimum value extraction, median value calculation, and the like can be exemplified.
- FIG. 6 is a block diagram showing an outline of another luminance control in the present embodiment.
- FIG. 7 is a diagram illustrating another example of calculation of parameters.
- Calculation example 3 and calculation example 1 are different in the number of parameters. That is, calculation example 1 is based on the premise that two BL control blocks (BL control block A45 and BL control block B46) are connected to BL brightness control signal generation block 44 as shown in FIG. It was. On the other hand, in the calculation example 3, as shown in FIG. 6, three BL control blocks (BL control block A45, BL control block B46, and BL control block C47) are connected to the BL luminance control signal generation block 44. It is assumed that the configuration is the same. That is, in the display device 10 shown in FIG. 6, in addition to the BL control block A45 and the BL control block B46, a BL control block C47 is connected to the BL luminance control signal generation block 44. The BL control block C47 corresponds to the RGBW block 80, for example.
- the BL brightness control signal generation block 44 receives the parameter C from the BL control block C47 in addition to the parameters A and B from the BL control block A45 and the BL control block B46.
- the BL luminance control signal generation block 44 calculates the three parameters, and then generates a BL luminance control signal based on the calculation processing result.
- Calculation example 3 and calculation example 1 differ in the number of parameters considered as described above.
- parameter A is a duty ratio of 80/100
- parameter B is a duty ratio of 60/100
- parameter C is a duty ratio of 50/100.
- a PWM signal as a BL brightness control signal is generated.
- the BL brightness control signal generation block 44 generates a PWM signal with a duty of 24% and outputs the PWM signal to the BL unit control unit 32.
- the parameter type is a type other than the duty ratio, such as the brightness level, the same calculation processing is possible.
- FIG. 8 shows an embodiment of the present invention and is a block diagram showing a schematic configuration of the display device 10.
- the display device 10 of the present embodiment is different from the display device 10 of the first embodiment in the position where the RGBW block 80 is provided. That is, in the display device 10 of the first embodiment, the RGBW block 80 is provided in the signal line driving circuit 24, whereas in the present embodiment, the RGBW block 80 is provided in the timing control unit 40. It has been.
- the display device 10 of the present embodiment has the following advantages because the RGBW block 80 is provided in the timing control unit 40.
- the RGBW image processing circuit provided in the RGBW block 80 has a relatively large circuit scale. For this reason, it is mounted on the set side rather than a circuit (IC or the like) whose size is severely limited because it is mounted on a frame portion of the display panel 20 (liquid crystal display panel or the like) such as a signal line driving circuit (LCD driver IC or the like) 24.
- the timing control unit 40 (LCD controller IC or the like) is relatively easy to mount.
- the signal line driving circuit 24 can be made smaller. Therefore, the frame portion of the display panel 20 (liquid crystal display panel or the like) can be made smaller, and the display panel 20 The design can be improved.
- FIG. 9 shows an embodiment of the present invention and is a block diagram showing a schematic configuration of the display device 10.
- the display device 10 of the present embodiment is different from the display device 10 of the first embodiment in the position where the LABC block 70 is provided.
- the LABC block 70 is provided in the display device 10
- the LABC block 70 is provided separately from the display device 10. It has been.
- the display device 10 of the present embodiment has the following advantages because the LABC block 70 is provided separately from the display device 10.
- the illuminance detection unit 94 (illuminance sensor or the like) is often mounted on a set-side substrate, not an image display device.
- the LABC block 70 is often implemented not by a display device but by a CPU or LSI on the set side.
- the function of the LABC provided on the set side can be effectively utilized, the structure is simplified, and the manufacturing is performed. It becomes easy, and it becomes possible to suppress cost.
- the configuration of the display panel 20 is not particularly limited.
- the display device 10 can be configured as a liquid crystal display device.
- Backlight unit In the above description, the configuration in which the backlight unit 30 and the BL unit control unit 32 are provided in the display device 10 has been described. However, the present invention is not limited to this configuration. For example, the backlight unit 30 and the BL unit control unit 32 can be provided separately from the display device 10.
- Timing control part In the above description, the configuration in which the timing control unit 40 is provided in the display device 10 has been described. However, the configuration is not limited to this configuration. For example, other than the BL luminance control signal generation block 44 can be provided separately from the display device 10.
- the display device of the present invention includes: A backlight unit is connected to the signal generation unit via a backlight unit control unit, The luminance control signal is input from the signal generation unit to the backlight unit control unit, The backlight unit control unit controls the luminance of the backlight unit according to the input luminance control signal.
- the display device of the present invention is The backlight unit control unit and the backlight unit are provided.
- the control of the backlight unit control unit by the luminance control signal generated by the signal generation unit can be easily configured. .
- the display device of the present invention is The parameter can be a duty ratio of the PWM signal.
- the display device of the present invention is The parameter can be the luminance level of the backlight.
- the display device of the present invention is
- the signal generation unit may generate the luminance control signal by multiplying a plurality of input parameters.
- the method for generating the luminance control signal of the present invention includes:
- the arithmetic processing is multiplication.
- the arithmetic processing is multiplication, the arithmetic processing can be performed with a simple circuit configuration. Further, by multiplying the parameters, it is possible to easily generate a luminance control signal in which each luminance control factor is favorably reflected.
- the display device of the present invention is
- the luminance control signal is a PWM signal.
- control signal is a PWM signal
- the display device of the present invention is The parameter is output from at least one of an image signal conversion unit, an external light illuminance processing unit, an image information processing unit, and a user input unit.
- the brightness of the backlight is determined based on various parameters related to the brightness of the backlight.
- the display device of the present invention is The display device is provided with a display panel,
- the display panel is a liquid crystal display panel.
- the method for generating the luminance control signal of the present invention includes:
- the arithmetic processing is at least one of arithmetic average value calculation, weighted average value calculation, maximum value extraction, minimum value extraction, and median value calculation.
- the method for generating the luminance control signal of the present invention includes:
- the calculation process is a process based on a combination table, which is a table in which signals for controlling the corresponding luminance for combinations of the plurality of parameter values are predetermined.
- the present invention can be suitably used for a display device that controls the luminance of a backlight unit based on a plurality of factors.
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Abstract
Description
図10に基づいて説明する。図10は、従来技術を示すものであり、輝度制御の概要を示すブロック図である。
つぎに、図11に基づいて、上記制御信号合成部130における、上記PWM信号Aと上記PWM信号Bとの合成について説明する。上記図11は、従来技術を示すものであり、PWM信号の重畳の概要を示す波形図である。
バックライトの輝度を制御するための輝度制御信号を生成する信号生成部が設けられている表示装置であって、
上記信号生成部には、バックライトの輝度に関する複数個のパラメーターが入力され、
上記信号生成部は、入力された複数個の上記パラメーターを演算処理し、該演算処理の結果に基づいて、上記輝度制御信号を生成することを特徴とする。
バックライトの輝度を制御するための輝度制御信号の生成方法であって、
上記輝度に関する複数個のパラメーターをあらかじめ演算処理し、その演算結果に基づいて、上記輝度を制御するための信号を生成することを特徴とする。
本発明の一実施の形態について図1から図7に基づいて説明すると以下の通りである。
本実施の形態の表示装置10の概略構成について、図1に基づいて説明する。図1は、表示装置10の概略構成を示すブロック図である。
つぎにタイミングコントロール部40について説明する。
上記タイミング生成ブロック42は、入力された垂直/水平同期信号に基づき、走査線駆動回路制御信号と信号線駆動回路制御信号とを生成するブロックである。
上記CABC(Content Adaptive Backlight Control)ブロック50は、入力された画像の明るさ等に応じて入力画像信号を階調変換し、出力画像信号として上記信号線駆動回路24に出力するするブロックである。併せて、上記CABCブロック50は、入力画像信号に応じて、バックライトユニット30の輝度を制御するためのパラメーターを算出する。
つぎに、LABC(Light Adaptive Backlight Control)ブロック70について説明する。このLABCブロック70は、表示装置10の環境照度、例えば周辺の明るさに応じて、上記バックライトユニット30の好適な輝度を決定するブロックである。
つぎに、RGBWブロック80について説明する。このRGBWブロック80は、RGB(Red、Green、Blue)3色の上記出力画像信号を、RGBW(Red、Green、Blue、White)4色の画像信号に変換するブロックである。また、Wの画素の明るさに応じて、バックライトユニット30の好適な輝度を算出する。
つぎにユーザー入力部92について説明する。このユーザー入力部92は、表示装置10のユーザーが、表示画像の明るさ・バックライトユニット30の明るさについて、任意の明るさ設定を入力する部分である。
つぎに、BL輝度制御信号生成ブロック44について説明する。このBL輝度制御信号生成ブロック44は、BL輝度制御信号(輝度制御信号)を生成し、上記BLユニット制御部32に入力するブロックである。
つぎに、BL輝度制御信号の生成について説明する。
つぎに、図3に基づいて、パラメーターの計算例について説明する。図3は、本実施の形態におけるパラメーターの計算例を示す図である。
つぎに、図4に基づいて、パラメーターの他の計算例について説明する。図4は、本実施の形態におけるパラメーターの他の計算例を示す図である。
つぎに、図6及び図7に基づいて、パラメーターの他の計算例について説明する。図6は、本実施の形態における他の輝度制御の概要を示すブロック図である。また、図7は、パラメーターの他の計算例を示す図である。
本発明の表示装置10に関するする他の実施の形態について、図8に基づいて説明すれば、以下の通りである。図8は、本発明の実施の形態を示すものであり、表示装置10の概略構成を示すブロック図である。
本発明の表示装置10に関するする他の実施の形態について、図8に基づいて説明すれば、以下の通りである。図9は、本発明の実施の形態を示すものであり、表示装置10の概略構成を示すブロック図である。
上記各実施の形態において、表示パネル20の構成は特には限定されない。
(バックライトユニット)
また、上記の説明ではバックライトユニット30及びBLユニット制御部32とが、表示装置10に設けられている構成について説明したが、この構成には限定されない。例えば、バックライトユニット30及びBLユニット制御部32を、表示装置10とは別個に設けることも可能である。
(タイミングコントロール部)
また、上記の説明では、タイミングコントロール部40が表示装置10に設けられている構成について説明したが、この構成には限定されない。例えば、上記BL輝度制御信号生成ブロック44以外を、表示装置10とは別個に設けることも可能である。
上記信号生成部には、バックライトユニット制御部を介してバックライトユニットが接続されており、
上記輝度制御信号は、上記信号生成部から上記バックライトユニット制御部に入力され、
上記バックライトユニット制御部は、入力された上記輝度制御信号に応じて上記バックライトユニットの輝度を制御することを特徴とする。
上記バックライトユニット制御部及びバックライトユニットが設けられていることを特徴とする。
上記パラメーターを、PWM信号のデューティー比とすることができる。
上記パラメーターを、バックライトの輝度レベルとすることができる。
上記信号生成部は、入力された複数個の上記パラメーターを互いに掛け合わせることで、上記輝度制御信号を生成することを特徴とする。
上記演算処理が掛け算であることを特徴とする。
上記輝度制御信号が、PWM信号であることを特徴とする。
上記パラメーターが、画像信号変換部,外光照度処理部,画像情報処理部,ユーザー入力部のうちの少なくとも1つから出力されていることを特徴とする。
上記表示装置には表示パネルが設けられており、
上記表示パネルが液晶表示パネルであることを特徴とする。
上記演算処理が、相加平均値算出,加重平均値算出,最大値抽出,最小値抽出,及び中央値算出の内の少なくとも1つであることを特徴とする。
上記演算処理が、上記複数個のパラメーターの値の組み合わせに対して、対応する上記輝度を制御するための信号があらかじめ定められているテーブルである組み合わせテーブルに基づく処理であることを特徴とする。
20 表示パネル
22 走査線駆動回路
24 信号線駆動回路
30 バックライトユニット
32 BLユニット制御部
40 タイミングコントロール部
42 タイミング生成ブロック
44 BL輝度制御信号生成ブロック
45 BL制御ブロックA
46 BL制御ブロックB
47 BL制御ブロックC
50 CABCブロック
52 画像解析部
54 階調変換部
56 階調特性決定部
58 BL制御パラメーター算出部
70 LABCブロック
72 フィルタ部
74 BL制御パラメーター算出部
80 RGBWブロック
82 RGBデータ変換部
84 拡張係数演算部
86 BL制御パラメーター算出部
90 システム側コントロール部
92 ユーザー入力部
94 照度検知部
100 表示装置
110 BL制御ブロックA
120 BL制御ブロックB
130 制御信号合成部
140 BLユニット制御部
150 バックライトユニット
Claims (13)
- バックライトの輝度を制御するための輝度制御信号を生成する信号生成部が設けられている表示装置であって、
上記信号生成部には、バックライトの輝度に関する複数個のパラメーターが入力され、
上記信号生成部は、入力された複数個の上記パラメーターを演算処理し、該演算処理の結果に基づいて、上記輝度制御信号を生成することを特徴とする表示装置。 - 上記信号生成部には、バックライトユニット制御部を介してバックライトユニットが接続されており、
上記輝度制御信号は、上記信号生成部から上記バックライトユニット制御部に入力され、
上記バックライトユニット制御部は、入力された上記輝度制御信号に応じて上記バックライトユニットの輝度を制御することを特徴とする請求項1に記載の表示装置。 - 上記バックライトユニット制御部及びバックライトユニットが設けられていることを特徴とする請求項2に記載の表示装置。
- 上記パラメーターが、PWM信号のデューティー比であることを特徴とする請求項1~3の何れか1項に記載の表示装置。
- 上記パラメーターが、上記バックライトの輝度レベルであることを特徴とする請求項1~3の何れか1項に記載の表示装置。
- 上記信号生成部は、入力された複数個の上記パラメーターを互いに掛け合わせることで、上記輝度制御信号を生成することを特徴とする請求項1~5の何れか1項に記載の表示装置。
- 上記輝度制御信号が、PWM信号であることを特徴とする請求項1~6の何れか1項に記載の表示装置。
- 上記パラメーターが、画像信号変換部,外光照度処理部,画像情報処理部,ユーザー入力部のうちの少なくとも1つから出力されていることを特徴とする請求項1~7の何れか1項に記載の表示装置。
- 請求項1から8の何れか1項に記載の表示装置には表示パネルが設けられており、
上記表示パネルが液晶表示パネルであることを特徴とする液晶表示装置。 - バックライトの輝度を制御するための輝度制御信号の生成方法であって、
上記輝度に関する複数個のパラメーターをあらかじめ演算処理し、その演算結果に基づいて、上記輝度を制御するための信号を生成することを特徴とする輝度制御信号の生成方法。 - 上記演算処理が掛け算であることを特徴とする請求項10に記載の輝度制御信号の生成方法。
- 上記演算処理が、相加平均値算出,加重平均値算出,最大値抽出,最小値抽出,及び中央値算出の内の少なくとも1つであることを特徴とする請求項10に記載の輝度制御信号の生成方法。
- 上記演算処理が、上記複数個のパラメーターの値の組み合わせに対して、対応する上記輝度を制御するための信号があらかじめ定められているテーブルである組み合わせテーブルに基づく処理であることを特徴とする請求項10に記載の輝度制御信号の生成方法。
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