WO2012017899A1 - 表示制御方法、表示制御装置、液晶表示装置、表示制御プログラムおよびコンピュータ読取可能な記録媒体 - Google Patents
表示制御方法、表示制御装置、液晶表示装置、表示制御プログラムおよびコンピュータ読取可能な記録媒体 Download PDFInfo
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- luminance
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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
- G09G3/36—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
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
- G09G3/2025—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
-
- 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
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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
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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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
- G09G2320/0613—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
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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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
Definitions
- the present invention relates to a liquid crystal display device provided with a backlight as a light source unit for image display, and the backlight luminance and the gradation distribution setting (gamma setting) of the liquid crystal display according to the gradation of the image to be displayed. Display control to be changed.
- the liquid crystal display device has an excellent characteristic that it is thin and lightweight and has low power consumption.
- user demands for high image quality and low power consumption are increasing.
- reducing power consumption in portable electronic devices such as mobile phones or PDAs (Personal Digital Assistants) increases the use time by one charge, which improves convenience for the user.
- the CABC Contents Adaptive Backlight Control
- the ratio of the backlight luminance to the maximum luminance and the gradation distribution setting of the display image are controlled in accordance with the characteristics (gradation distribution) of the image to be displayed.
- the backlight luminance and gradation distribution setting at the time of full screen white display are used as a reference.
- the reference backlight luminance is the maximum level, and the reference gradation distribution setting assumes that the output gradation and the input gradation have a directly proportional relationship.
- the gradation distribution setting is slightly lifted (that is, slightly higher than the reference). Set the backlight brightness down.
- FIGS. 13C and 13D as the image becomes darker, the gradation distribution setting is further floated to lower the backlight luminance accordingly.
- the power consumption of the backlight is significantly reduced while maintaining the same overall brightness and appearance. can do.
- Patent Document 1 listed below discloses a technique for solving the problem that flickering occurs as a result of the timing of switching the luminance of the backlight and the timing of image display being shifted due to temperature changes.
- FIG. 12 is a block diagram showing the configuration of the liquid crystal display device disclosed in Patent Document 1.
- the liquid crystal display device 100 includes an image feature determination circuit 101, an image data conversion circuit 102, a backlight control circuit 103, a luminance value setting circuit 104 and a timing setting circuit 105 that constitute the backlight control circuit 103, A liquid crystal panel 106, a backlight unit 107, and temperature measuring means 108 installed in the vicinity of the liquid crystal panel 106 are provided.
- Image data to be output to the liquid crystal panel 106 is first input to the image feature discrimination circuit 101 and the image data conversion circuit 102.
- the image feature discrimination circuit 101 extracts image features mainly centering on the maximum luminance value in the image, outputs the result to the luminance value setting circuit 104 as backlight luminance data, and outputs image data as image feature data. Output to the conversion circuit 102.
- the image data conversion circuit 102 converts the input image data into display image data based on the image feature data and outputs it to the liquid crystal panel 106.
- the luminance value setting circuit 104 sets a backlight luminance value based on the input backlight luminance data, generates a backlight control signal corresponding to the timing output by the timing setting circuit 105, and outputs the backlight control signal to the backlight unit 107. .
- Patent Document 1 describes that the timing of the display image change and the luminance change of the backlight can be matched.
- the backlight luminance change time is set to about 1 ms or less, which is a time sufficiently shorter than the response delay of the liquid crystal element (usually several ms to several tens of ms), and the liquid crystal transmittance change is completed. It is described that it is preferable in terms of image quality to change the backlight luminance at the previous timing.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device having a backlight as a light source unit for image display according to the characteristics of the image to be displayed.
- An object of the present invention is to provide a display control technique capable of suppressing deterioration of image quality as much as possible in the CABC technique for changing the luminance of light and the gradation distribution of a display image.
- a display control method provides: (1) A display control method for changing the luminance of a backlight that irradiates light to a liquid crystal display panel and the gradation distribution of an image displayed on the liquid crystal display panel according to the characteristics of the image to be displayed, (2) When changing the first image data in the first frame to the second image data in the second frame following the first frame, it takes a backlight luminance change time of a plurality of frame periods.
- the first gradation distribution setting corresponding to the first image data is set to the second gradation distribution setting corresponding to the second image data over the gradation distribution change time of a plurality of frame periods.
- the second dimming period including at least the start timing and the processing time of the second dimming process is controlled according to the temperature of the liquid crystal display panel.
- the luminance of the backlight is gradually changed over a plurality of frame periods instead of instantaneously changing the luminance of the backlight. That is, the point in time when the backlight luminance reaches the second backlight luminance is later than the second frame by a plurality of frame periods.
- the second dimming process for gradually changing the gradation distribution (for example, gamma setting) of the liquid crystal display panel over the gradation distribution change time of a plurality of frame periods is executed.
- the response of the liquid crystal changes.
- the dimming period including at least the start timing and processing time of the second dimming process is controlled according to the temperature, a high-quality image is always displayed on the liquid crystal display regardless of the responsiveness of the liquid crystal. Can be displayed on the panel.
- the processing time of the first dimming process is equal to a plurality of frame periods as the backlight luminance change time
- the processing time of the second dimming process is equal to the plurality of frame periods as the gradation distribution change time. This does not mean that the two or more frame periods have the same length.
- the display control device is: (1) A display control device that changes the luminance of a backlight that irradiates light on a liquid crystal display panel and the gradation distribution of an image displayed on the liquid crystal display panel in accordance with the characteristics of the image to be displayed, (2) When changing the first image data in the first frame to the second image data in the second frame following the first frame, it takes a backlight luminance change time of a plurality of frame periods. The first backlight luminance corresponding to the first image data is changed to the second backlight luminance corresponding to the second image data by the first dimming process for changing the luminance of the backlight.
- At least the second dimming processing unit transmits the dimming period including the start timing and processing time of the second dimming process via the temperature measurement unit, as described for the display control method. Therefore, it is possible to always display a high-quality image on the liquid crystal display panel regardless of the responsiveness of the liquid crystal.
- a liquid crystal display device provided with the display control device (for example, a mobile phone, a PDA, a personal computer provided with a display, a television of various sizes, a projector, etc.), and a computer with the first dimming process in the display control device
- a display control program that functions as a display unit and a second dimming processing unit, and a computer-readable recording medium that stores the display control program are also included in the scope of the present invention.
- the display control method and the display control apparatus when the gradation of an image to be displayed changes between two consecutive frames, changes from the first luminance to the second luminance according to each gradation before and after the change.
- the first dimming process for changing the brightness of the backlight and the second dimming process for changing the first gradation distribution setting to the second gradation distribution setting are performed over a plurality of frame periods, and at least The second dimming period including the start timing and processing time of the second dimming process is controlled according to the temperature of the liquid crystal display panel.
- FIG. 1 is an explanatory diagram showing a specific example of CABC (Contents Adaptive Backlight Control) technology according to the display control method of the present invention in the case of a low temperature.
- CABC Content Adaptive Backlight Control
- the luminance of the backlight hereinafter abbreviated as BL luminance
- BL luminance the luminance of the backlight
- this is a technique for controlling the backlight luminance and gradation distribution setting according to the display image.
- dimming processing when controlling to change the backlight luminance (hereinafter referred to as BL luminance) or the gradation distribution setting, multiplying a plurality of frame periods as a period required for the change (switching period) is called dimming processing.
- the “average gradation” referred to below is the gradation that is displayed on each pixel constituting the display screen of the liquid crystal display panel, the average of all the pixels, or when the display screen is divided into a plurality of regions. Means a gray scale averaged over a region of interest among a plurality of regions.
- the “average gradation” is a scale representing the gradation distribution of the display image.
- the tone distribution characteristics of the image are analyzed using a histogram analysis method that integrates the number of pixels that use each tone, but here, for convenience of explanation, the tone distribution of the image by the average tone The description will be made assuming that the characteristics can be expressed.
- the first average gradation (dark image A) in the frame n (first frame) is set to the second (n + 1) frame (second frame) following the frame n.
- the average gradation (bright image B) is changed, the luminance ⁇ 1 (first luminance) corresponding to the first average gradation is changed over the second average over a plurality of frame periods.
- the process of changing the BL brightness to the brightness ⁇ 2 (second brightness) corresponding to the average gradation will be referred to as a first dimming process.
- the bright image B is a full screen white display image for convenience of explanation.
- the luminance ⁇ 2 corresponds to the BL luminance level 4 (maximum) shown in FIG. 13A
- the level 2 which is the gradation distribution setting corresponding to the bright image B is shown in FIG. As shown, this corresponds to the basic gradation distribution setting in which the output gradation and the input gradation are in a directly proportional relationship.
- the gradation of the image is switched from the first average gradation to the second average gradation in one frame period.
- the luminance ⁇ 1 is maintained in the frame (n + 1), starts increasing from the frame (n + 2), and reaches the luminance ⁇ 2 in the frame (n + m), so the BL luminance is (m ⁇ 1)
- the luminance ⁇ 1 is switched to the luminance ⁇ 2. That is, the BL luminance change time is (m ⁇ 1) frame periods.
- the gradation distribution corresponding to the first average gradation is multiplied by the gradation distribution change time of a plurality of frame periods.
- the process of changing the setting level 1 (first gradation distribution setting) to the gradation distribution setting level 2 (second gradation distribution setting) corresponding to the second average gradation is the second. This will be referred to as a dimming process.
- the level 1 is maintained in the frame (n + 1), starts changing from the frame (n + 2), and reaches the level 2 in the frame (n + m ⁇ k + 1). Is a (m ⁇ k ⁇ 1) frame period.
- the display control method of the present invention is characterized by a first dimming period (hereinafter referred to as a BL luminance dimming period) including the start timing and processing time of the first dimming process, and the start of the second dimming process.
- a first dimming period hereinafter referred to as a BL luminance dimming period
- the second dimming period including timing and processing time hereinafter, referred to as a dimming period for gradation distribution setting
- at least the dimming period for gradation distribution setting is controlled according to the temperature of the liquid crystal display panel. is there.
- Responsiveness of the liquid crystal changes when the temperature of the liquid crystal display panel changes due to changes in geographical or seasonal environmental temperature or rises as the operation time of the liquid crystal display panel elapses. For example, when a user who has a mobile phone moves from a warm area to a cold area, the response speed of the liquid crystal slows down, so the image quality obtained at room temperature in the warm area remains unchanged in the cold area. You can't get it.
- the display control method of the present invention at least the dimming period of the gradation distribution setting is controlled according to the temperature. As a result, even if the temperature of the liquid crystal display panel changes, the correspondence between the BL luminance and the gradation distribution setting level can be brought close to or substantially equal to the correspondence at the normal temperature. Regardless of the responsiveness, a high-quality image can always be displayed on the liquid crystal display panel.
- the BL luminance dimming period may be maintained at room temperature without being controlled according to the temperature.
- FIG. 3 is a block diagram illustrating a configuration example of a display control apparatus that executes the display control method.
- the display control apparatus 1 changes the brightness of the BL unit (backlight) 2 that irradiates light to the liquid crystal display panel and the gradation distribution setting of the liquid crystal display panel in accordance with the gradation distribution of the image to be displayed. It has a configuration.
- the BL unit may include a backlight driver.
- the display control device 1 includes a first dimming processing unit 3 that controls the BL unit 2 by the first dimming process, and a floor of the liquid crystal display panel by the second dimming process.
- a second dimming processing unit 4 that determines the tone distribution setting is provided as a main configuration.
- a temperature measuring unit 5 for directly or indirectly measuring the surface temperature of the liquid crystal display panel is provided outside the display control device 1.
- Information on the temperature measured by the temperature measurement unit 5 is transmitted to the first dimming processing unit 3 and the second dimming processing unit 4 via the measured temperature information transmission unit 6.
- a configuration in which the output of the measured temperature information transmission unit 6 is connected only to the second dimming processing unit 4 is also an embodiment of the present invention.
- the temperature sensor which comprises the temperature measurement part 5 may be directly measured by installing the temperature sensor in the surface or inside of a liquid crystal display panel, or the temperature sensor of a liquid crystal display panel may be measured.
- the temperature of the liquid crystal display panel may be indirectly measured by installing it in a housing or the like and measuring the ambient temperature of the liquid crystal display panel.
- the first dimming processing unit 3 determines the BL luminance dimming period including the start timing and processing time of the first dimming process according to the temperature of the liquid crystal display panel acquired through the temperature measuring unit 5. Control.
- the second dimming processing unit 4 sets the tone distribution setting dimming period including the start timing and processing time of the second dimming process to the temperature of the liquid crystal display panel acquired through the temperature measuring unit 5. Control accordingly.
- the first dimming processing unit 3 includes a BL luminance dimming period determining unit 31 and a BL luminance control unit 32.
- the second dimming processing section 4 includes a gradation distribution setting dimming period determining section 41 and a gradation distribution setting control section 42.
- the display control device 1 includes an input image analysis unit 7, an input image determination unit 8, a BL luminance level determination unit 9, and a gradation distribution setting determination unit 10.
- the output of the BL luminance control unit 32 is connected to the BL unit 2, and the output of the gradation distribution setting control unit 42 is connected to the source driver output unit 11 that outputs a source signal to the liquid crystal display panel.
- image data for an image to be displayed on the liquid crystal display panel is input to the input image analysis unit 7.
- the input image analysis unit 7 calculates, for example, an integrated value of R (red), G (green), and B (blue) individual gradations for all pixels, or an average value of RGB individual gradations. , Analyze the input image data.
- the output of the input image analysis unit 7 is connected to the input image determination unit 8.
- the input image determination unit 8 determines what kind of image it is based on the result analyzed by the input image analysis unit 7.
- the output of the input image determination unit 8 is connected to a BL luminance level determination unit 9 and a gradation distribution setting determination unit 10.
- the output of the input image determination unit 8 is connected to the BL luminance dimming period determination unit 31 and the gradation distribution setting dimming period determination unit 41 in order to further improve the accuracy of the display control method of the present invention. May be. This improvement in accuracy will be described later.
- the BL luminance level determination unit 9 determines which level the BL luminance is set according to the input image data, that is, according to the gradation distribution of the image to be displayed. decide.
- the gradation distribution setting determination unit 10 determines which level the gradation distribution setting is to be set according to the gradation distribution of the image to be displayed based on the determination result of the input image determination unit 8.
- the BL luminance dimming period determining unit 31 sets the BL luminance dimming period according to the temperature measured by the temperature measuring unit 5 in the case of receiving the output of the measured temperature information transmitting unit 6.
- the BL brightness dimming period may be set according to the determination result of the input image determination unit 8, but can be set only according to the temperature regardless of the determination result. Or it can also set including both an image determination result and a temperature measurement result.
- the tone distribution setting dimming period determination unit 41 sets the tone distribution setting dimming period according to the temperature measured by the temperature measurement unit 5.
- the dimming period for gradation distribution setting may be set according to the determination result of the input image determination unit 8, but can be set according to only the temperature regardless of the determination result. Or it can also set including both an image determination result and a temperature measurement result.
- the outputs of the BL brightness level determination unit 9 and the BL brightness dimming period determination unit 31 are connected to the BL brightness control unit 32.
- the BL luminance control unit 32 actually controls the BL luminance level for each frame based on the information acquired from the BL luminance level determining unit 9 and the BL luminance dimming period determining unit 31.
- the BL luminance level determination unit 9 corresponds to the gradation distribution before and after the change, for example, the luminance from the luminance ⁇ 1 to the luminance ⁇ 2.
- Output change information in the BL luminance dimming period determined by the BL luminance dimming period determination unit 31, the BL luminance control unit 32 controls the level of the BL luminance for each frame so that the BL luminance changes from the luminance ⁇ 1 to the luminance ⁇ 2. To do.
- the BL unit 2 changes the luminance of the backlight composed of LED (Light Emitting Diode) or CCFL (Cold Cathode Fluorescent Lamp) according to the information of the BL luminance level sent from the BL luminance control unit 32.
- LED Light Emitting Diode
- CCFL Cold Cathode Fluorescent Lamp
- the outputs of the gradation distribution setting determining unit 10 and the gradation distribution setting dimming period determining unit 41 are connected to the gradation distribution setting control unit 42.
- the gradation distribution setting control unit 42 actually controls the gradation distribution setting (actual ⁇ ) for each frame based on the information acquired from the gradation distribution setting determining unit 10 and the dimming period determining unit 41 for gradation distribution setting. To do.
- the gradation distribution setting determination unit 10 corresponds to the gradation distribution before and after the change, for example, level 1 of the gradation distribution setting. Outputs information on change from to level 2. Further, in the dimming period for the tone distribution setting determined by the dimming period determining unit 41 for the tone distribution setting, the tone distribution setting control unit 42 sets the frame distribution so that the tone distribution setting changes from level 1 to level 2. Control gradation distribution setting for each.
- FIG. 4 shows, for reference, the configuration of a display control device 90 that does not perform display control based on temperature.
- the display control device 90 is different from the display control device 1 only in that the temperature measurement unit 5 and the measured temperature information transmission unit 6 are not provided.
- Example 1-1 (Diming period determination and display control) First, as shown in FIG. 1, image data of an image A (low gradation) to be displayed as a frame n on the liquid crystal display panel is input to the input image analysis unit 7.
- the input image analysis unit 7 analyzes the input image data as described above, and outputs the result to the input image determination unit 8.
- the input image determination unit 8 determines that the image A is a dark image based on the result analyzed by the input image analysis unit 7, and uses the determination result as a BL luminance level determination unit 9 and a gradation distribution setting determination unit. 10 is output.
- the BL luminance level determining unit 9 determines the luminance ⁇ 1 as the level of the BL luminance corresponding to the low gradation of the image A, and the gradation distribution setting determining unit 10 corresponds to the low gradation of the image A.
- the level 1 is determined as the level of gradation distribution setting.
- the determined luminance ⁇ 1 information is output to the BL luminance control unit 32, and the determined level 1 information is output to the gradation distribution setting control unit.
- the BL luminance level determination unit 9 performs the same operation as described above.
- the luminance ⁇ 2 is determined as the BL luminance level corresponding to the high gradation, and the gradation distribution setting determining unit 10 determines the level 2 as the gradation distribution setting level corresponding to the high gradation of the image B.
- the information on the new luminance ⁇ 2 is output to the BL luminance control unit 32, and the information on the new level 2 is output to the gradation distribution setting control unit 42.
- the BL luminance level and the gradation distribution setting level are associated in multiple stages as described with reference to FIG. Therefore, the associated BL luminance level and gradation distribution setting level are appropriately selected according to the brightness of the image data determined by the image analysis unit 7.
- the BL luminance dimming period determining unit 31 determines the BL luminance dimming period according to the current temperature. Request setting of. In the embodiment in which the BL luminance dimming period is not set according to the current temperature, the BL luminance dimming period is not changed for the normal temperature.
- the gradation distribution setting control unit 42 recognizes the change in the level of the gradation distribution setting accompanying the change in the gradation distribution as described above, the gradation distribution setting control unit 42 notifies the current dimming period setting unit 41 of the gradation distribution setting to the current level. Requests setting of a dimming period for gradation distribution setting according to temperature.
- the BL luminance dimming period determining unit 31 sets the BL luminance dimming period as the BL luminance dimming period according to the current temperature measured by the temperature measuring unit 5 in the example of FIG. Determine the frame period.
- the gradation distribution setting dimming period determination unit 41 determines the (m ⁇ k ⁇ 1) frame period as the gradation distribution setting dimming period according to the current temperature, as described above. This (m ⁇ k ⁇ 1) frame period is determined in accordance with the temperature at which the current temperature of the liquid crystal display panel is lower than the normal temperature, and is set shorter than the BL luminance dimming period.
- the BL luminance control unit 32 performs actual measurement based on the luminance ⁇ 1 and ⁇ 2 information acquired from the BL luminance level determination unit 9 and the (m ⁇ 1) frame period information acquired from the BL luminance dimming period determination unit 31.
- the level of BL brightness for each frame is controlled gradually or stepwise. That is, the BL luminance control unit 32 maintains the luminance of the BL unit 2 at the luminance ⁇ 1 in the frame (n + 1), starts increasing from the frame (n + 2), and reaches the luminance ⁇ 2 in the frame (n + m). 2 brightness is controlled.
- the gradation distribution setting control unit 42 acquires the level 1 and level 2 information acquired from the gradation distribution setting determination unit 10 and the dimming period determination unit 41 for gradation distribution setting (m ⁇ k ⁇ 1). ) The gradation distribution setting level for each frame is actually controlled gradually or stepwise based on the frame period information. That is, the gradation distribution setting control unit 42 maintains the gradation distribution setting at level 1 in the frame (n + 1), starts changing from the frame (n + 2), and reaches level 2 in the frame (n + m ⁇ k + 1). The image data conversion process in the source driver output unit 11 is controlled.
- the BL luminance dimming period determination unit 31 and the tone distribution setting dimming period determination unit 41 may set each dimming period according to the determination result of the input image determination unit 8. With this method, it is possible to perform dimming processing that finely corresponds to the amount of change before and after the change in the tone distribution.
- FIG. 2 is an explanatory diagram showing a specific example of the CABC technique in the case of room temperature.
- the BL luminance dimming period and the gradation distribution setting dimming period are set to (m ⁇ 1) frame periods. That is, at normal temperature, the dimming period for gradation distribution setting is adjusted so that the timing at which the change in the liquid crystal and the change in the luminance of the backlight are almost the same.
- the dimming period of the low temperature BL brightness is the same as that at the normal temperature, whereas The dimming period for gradation distribution setting is shorter than that at room temperature.
- the BL luminance level and the gradation distribution setting level before and after the dimming process do not change depending on the temperature, so that the rate at which the BL luminance is changed (change rate) is the same as that at normal temperature.
- the ratio at which the gradation distribution setting is changed (change rate) is set to be higher at a temperature lower than normal temperature than at normal temperature. The reason is as follows.
- the reason why the BL brightness dimming period at the low temperature is the same as that at the normal temperature is because the response of the liquid crystal becomes slower at the low temperature than at the normal temperature, so it is necessary to speed up the change of the gradation distribution setting at the low temperature.
- the change time of the backlight luminance hardly depends on the ambient temperature, it is not necessary to shorten the change time of the backlight luminance.
- the display change is terminated at the same timing as that at the normal temperature, basically it is not necessary to shorten the backlight luminance change time.
- the liquid crystal display panel since the response of the liquid crystal becomes slower than that at room temperature at low temperatures, the liquid crystal itself cannot completely change during the dimming period at room temperature. As a result, the change of the liquid crystal ends after the end of the dimming period. In other words, the end timings of the change in the brightness of the backlight and the change in the liquid crystal are different from those at room temperature, so that the image displayed on the liquid crystal display panel has an effect such as flickering or a change in brightness.
- the gradation distribution setting dimming period at a low temperature becomes shorter than the BL luminance dimming period.
- the dimming period of BL luminance and gradation distribution setting is made equal at low temperatures, the state in which the gradation distribution characteristics change after BL luminance changes can be seen as an appearance. As a result, the human eye perceives a difference between the change in BL luminance and the change in gradation distribution characteristics, and thus cannot feel the same image quality as that at room temperature.
- the dimming period for gradation distribution setting is controlled to be shorter than the dimming period for BL luminance at a temperature lower than room temperature, the change in the gradation distribution setting becomes faster than the change in the luminance of the backlight. Can be resolved.
- the lower limit of the dimming period for gradation distribution setting may be two frame periods.
- FIG. 5 is an explanatory diagram showing another specific example of the CABC technique according to the display control method of the present invention in the case of a low temperature.
- Example 1-1 attention was paid to the fact that the tone distribution setting dimming period at a low temperature is controlled to be shorter than the tone distribution setting dimming period at room temperature.
- This embodiment is further characterized in that the BL luminance dimming period at a low temperature is controlled to be longer than the BL luminance dimming period at a normal temperature.
- the BL luminance dimming period is made longer than that in FIG. 2, and is set to (m) frame period, so that, for example, one frame period than the BL luminance dimming period at room temperature. It is long.
- the dimming period for setting the tone distribution as in Example 1-1 is reduced. This is because the change in the liquid crystal may not be completed by the end of the BL brightness dimming period at room temperature, even if it is shorter than that at room temperature. Therefore, according to the control shown in FIG. 5, the change of the liquid crystal can be surely terminated before the BL luminance dimming period is completed, and high image quality can be ensured.
- the BL luminance dimming period be 1 to 5 frames longer than the BL luminance dimming period set at the normal temperature.
- the dimming period (m ⁇ k ⁇ 2) for gradation distribution setting is further shortened by one frame period as compared with the case of Example 1-1, but is merely an example, and if it is shorter than the BL luminance dimming period, Good.
- FIG. 6 is an explanatory diagram showing a specific example of the CABC technology according to the display control method of the present invention in the case of high temperature
- FIG. 7 is an explanatory diagram showing a specific example of the CABC technology in the case of normal temperature. 7 is the same as FIG. 2 in terms of content, but the length of the horizontal axis (time axis) is more compressed than that of FIG.
- the BL luminance As shown in FIG. 6, when the image is switched from the dark image A of the frame n to the bright image B of the frame (n + 1), when it is detected that the temperature of the liquid crystal display panel is higher than normal temperature, As for the BL luminance, as in the case of normal temperature, the luminance ⁇ 1 is maintained in the frame (n + 1), starts increasing from the frame (n + 2), and reaches the luminance ⁇ 2 in the frame (n + m + 1). Accordingly, the BL luminance is switched from the luminance ⁇ 1 to the luminance ⁇ 2 in the (m ⁇ 1) frame period as a BL luminance dimming period.
- the tone distribution setting dimming period is an (m + k ⁇ 2) frame period, which is set longer than the BL luminance dimming period.
- the ratio (change rate) for changing the gradation distribution setting is higher than the normal temperature than the normal temperature.
- the ratio at high temperature is reduced. The reason is as follows.
- the response of the liquid crystal is faster than at normal temperature, so that the change in the liquid crystal ends before the dimming period at normal temperature ends.
- the end timings of the change in the brightness of the backlight and the change in the liquid crystal are different from those at room temperature, so that the image displayed on the liquid crystal display panel has an effect such as flickering or a change in brightness.
- the response speed of the liquid crystal is about 1/2 to 1 / 2.5 times faster at high temperatures than at normal temperatures, so the upper limit of the dimming period for setting the gradation distribution at high temperatures is normal temperature. It is preferable to be within 3 times the dimming period of the gradation distribution setting that is sometimes set.
- the upper limit of the dimming period for gradation distribution setting at high temperature is the upper limit of the dimming period for BL luminance set at normal temperature. It can also be said that it is preferable to set it within 3 times.
- FIG. 8 is an explanatory diagram showing another specific example of the CABC technique according to the display control method of the present invention in the case of a high temperature.
- Example 1-3 attention is paid to the fact that the dimming period for setting the gradation distribution at high temperature is controlled to be longer than the dimming period for setting the gradation distribution at normal temperature.
- the dimming period for BL brightness at high temperature is controlled. It is further characterized in that it is controlled to be shorter than the BL brightness dimming period at room temperature.
- the BL luminance dimming period is made shorter than in the case of FIG.
- the frame period is shortened.
- the change in the tone distribution characteristics also increases as the response speed of the liquid crystal increases, particularly at high temperatures. This is because it is considered that the change in the liquid crystal may end before the dimming period of the BL luminance at the normal temperature ends even if it is longer than that at the normal temperature. Therefore, in such a case, by the control shown in FIG. 8, the end of the BL luminance dimming period and the end of the change of the liquid crystal can be matched almost at the same time as at room temperature, and high image quality is obtained. be able to.
- the BL luminance dimming period is preferably 1 to 5 frames shorter than the BL luminance dimming period set at room temperature.
- FIG. 9 is a block diagram showing another configuration example of the display control apparatus according to the present invention.
- the display control apparatus 21 of the present embodiment includes a first dimming processing unit 30 and a second dimming processing unit corresponding to the first dimming processing unit 3 and the second dimming processing unit 4.
- the display control device 1 is different from the display control device 1 in that 40 is provided.
- the first dimming processing unit 30 includes a first dimming processing unit 30 according to the temperature of the liquid crystal display panel acquired through the temperature measurement unit 5.
- a BL luminance dimming start timing setting unit (first start timing setting unit) 33 for setting the start timing of the dimming process is provided.
- the second dimming processing unit 40 is a gradation distribution setting dimming start timing setting unit that sets the start timing of the second dimming process in accordance with the temperature of the liquid crystal display panel acquired via the temperature measuring unit 5. (Second start timing setting unit) 43 is provided.
- the determination result of the input image determination unit 8 may be output to the dimming start timing setting units 33 and 43, and each start timing may be set according to the determination result. Accordingly, it is possible to perform a dimming process that finely corresponds to the amount of change before and after the change of the gradation distribution.
- FIG. 10 is an explanatory diagram illustrating a display control method for adjusting the start timings of the BL luminance dimming period and the gradation distribution setting dimming period.
- each of the dimming start timing setting units 33 and 43 shown in FIG. 9 determines the start timing of the dimming period for gradation distribution setting when the temperature of the liquid crystal display panel is lower than room temperature. Set earlier than the start timing of the period.
- the BL luminance dimming period is the same as that at room temperature, and is an (m ⁇ 1) frame period.
- the BL luminance dimming period may be set longer than that at room temperature.
- the gradation distribution setting is maintained at level 1 until the frame (n + 1), starts changing from the frame (n + 2) that is one frame period earlier than the BL luminance, and is earlier by k frame periods than the BL luminance.
- Level 2 is reached in frame (n + m ⁇ k + 1). Therefore, the tone distribution setting dimming period is an (m ⁇ k) frame period, which is shorter than that at room temperature.
- the rate of change of the tone distribution characteristic (the characteristic determined by the tone distribution setting and visually recognized by humans) shows temperature dependence, and the change in the tone distribution characteristic becomes slow at low temperatures. For this reason, if the start timings of the first dimming process and the second dimming process are aligned at the same time, the change in the tone distribution characteristics may not catch up with the change in the luminance of the backlight. As a result, it can be considered that the appearance is such that the BL brightness is switched quickly and the gradation distribution characteristics are switched with a delay.
- the start timing of the second dimming process be 1 to 5 frames earlier than the start timing of the first dimming process.
- the dimming start timing of the BL luminance is compared between FIG. 2 and FIG. 10, the start is slower at the low temperature in FIG. 10, but this point has no special meaning. For example, if dimming is started for both the BL brightness and gradation distribution setting at the (n + 5) frame at room temperature, the BL brightness starts at the (n + 5) frame at low temperature, and the gradation distribution setting is at the (n + 2) frame. You may start.
- display control may be performed so that the start timing of the dimming period for gradation distribution setting is delayed (for example, 1 to 5 frames later) than the start timing of the BL luminance dimming period. Good. Thereby, the end of the change of the BL luminance and the end of the response of the liquid crystal can be matched.
- the BL luminance dimming period it is preferable to set the BL luminance dimming period to be the same as or shorter than that at room temperature, and to set the gradation distribution setting dimming period longer than at room temperature.
- FIG. 11 is a block diagram schematically showing the overall configuration of the liquid crystal display device according to the present invention.
- the liquid crystal display device includes a CPU 50, an input / output interface 51, a ROM 52, a RAM 53, and a liquid crystal driver 54 in addition to the display control device 1 or 21, the temperature measuring unit 5, and the measured temperature information transmitting unit 6.
- the CPU 50 reads out a control program stored in the ROM 52 (computer-readable recording medium), and controls input / output of various data and various control signals in the liquid crystal display device according to the control program while using the RAM 53 as a work area. Control.
- the image data processing unit 58 When image data input via a TV tuner or a communication unit connected to the Internet is input, the image data processing unit 58 generates a synchronization signal, adjusts brightness and saturation, corrects gradation distribution, etc.
- the RGB signal is generated through various processes.
- the RGB signal generated by the image data processing unit 58 is input to the CPU 50 and is output to the display control device 1 or 21 through the input / output interface 51 together with a necessary synchronization signal.
- the display control device 1 or 21 performs the above-described RGB distribution signal dimming processing for gradation distribution setting, and supplies the RGB signal and the synchronization signal that have been subjected to the gradation distribution setting dimming processing to the liquid crystal driver 54. At the same time, the BL luminance data generated based on the RGB signals is supplied to the backlight driver 56 together with the synchronization signal.
- the liquid crystal driver 54 includes the source driver output unit 11 and the gate driver output unit, and drives each pixel of the liquid crystal display panel based on the RGB signal and the synchronization signal supplied from the display control device 1 or 21.
- the backlight driver 56 controls the luminance of the backlight 57 for each frame based on the BL luminance data supplied from the display control device 1 or 21.
- the current temperature of the liquid crystal display panel 55 measured by the temperature measuring unit 5 is transmitted from the measured temperature information transmitting unit 6 to the display control device 1 or 21.
- the liquid crystal display device does not necessarily include the CPU 50, the input / output interface 51, the ROM 52, and the RAM 53. That is, the liquid crystal display device according to the present invention includes a liquid crystal driver 54, a liquid crystal display panel 55, and the BL unit in addition to the display control device 1 or 21, the temperature measuring unit 5, and the measured temperature information transmitting unit 6. 2 may include a backlight driver 56, a backlight 57, and an image data processing unit 58.
- the luminance ⁇ 1 is changed according to each gradation before and after the change.
- the first dimming process for changing the luminance of the backlight to the luminance ⁇ 2 and the second dimming process for changing the gradation distribution setting from the level 1 to the level 2 are performed over a plurality of frame periods, and at least the second dimming process is performed.
- the second dimming period including the start timing and the processing time of the dimming process is controlled according to the temperature of the liquid crystal display panel.
- the processing time of the second dimming process it is preferable to control the processing time of the second dimming process so that the processing time at a temperature lower than normal temperature is shorter than the processing time at normal temperature.
- the rate at which the gradation distribution setting is changed (change rate) is larger than the rate at room temperature.
- the responsiveness of the liquid crystal is slower than at normal temperature, so that the liquid crystal itself cannot change during the gradation distribution change time at normal temperature.
- the luminance change period of the backlight unit using LEDs or the like does not depend on the temperature.
- the change of the liquid crystal ends after the backlight luminance change time ends.
- the end timings of the change in the brightness of the backlight and the change in the liquid crystal are different from those at room temperature, so that the image displayed on the liquid crystal display panel has an effect such as flickering or a change in brightness.
- the processing time of the second dimming process is controlled to be longer than the processing time at the normal temperature.
- the rate at which the gradation distribution setting is changed (change rate) be smaller than the rate at room temperature.
- the response of the liquid crystal is faster than at normal temperature, so the change of the liquid crystal with respect to the applied voltage is completed before the end of the gradation distribution change time at normal temperature. Then, since the change of the liquid crystal is finished before the end of the backlight brightness change time, the end timings of the change of the backlight brightness and the change of the liquid crystal are different from those at normal temperature. As a result, the image displayed on the liquid crystal display panel has an effect such as flickering or luminance change.
- the processing time of the second dimming process is set as described above. It is preferable to control the time shorter than the processing time of the first dimming process.
- the processing time of the second dimming process is set as described above. It is preferable to perform control longer than the processing time of the first dimming process.
- changing the gradation distribution setting means changing the transmittance of the pixel by adjusting the voltage applied to the pixel so that the output gradation changes with respect to a certain input gradation. Don't be. Then, since the change rate of the transmittance of the pixel with respect to the change of the voltage applied to the pixel (liquid crystal responsiveness) shows temperature dependency, the change rate of the gradation distribution characteristic by changing the gradation distribution setting is also temperature dependent. Showing gender. That is, the change rate of the gradation distribution characteristic is small at a low temperature, while the change rate of the gradation distribution characteristic is high at a high temperature.
- the change rate of the luminance of the backlight that does not exhibit temperature dependency and the change rate of the gradation distribution characteristic that exhibits temperature dependency are made the same, in other words, the first dimming process and the second dimming process. If the processing times are equal, the change in the tone distribution characteristics according to the tone distribution setting will be slow, and as a result, the human eye will see a change in the brightness of the backlight and a change in the tone distribution characteristics. Since the difference is felt, the same image quality as that at room temperature cannot be felt.
- the processing time of the second dimming process is controlled to be shorter than the processing time of the first dimming process (however, the processing time of the second dimming process is 2 frames or more), At a temperature higher than normal temperature, if the processing time of the second dimming process is controlled to be longer than the processing time of the first dimming process, the end of the change in the gradation distribution characteristic and the end of the change in the luminance of the backlight Can be adjusted to the same state as that at room temperature, so that the above problem can be solved.
- the start timing of the second dimming process when the temperature is lower than room temperature, the start timing of the second dimming process is It is preferable to perform control so as to be earlier than the start timing of the first dimming process.
- the change rate of the gradation distribution characteristic shows temperature dependence, and the change of the gradation distribution characteristic becomes slow at low temperatures.
- the start timing of the second dimming process when the temperature is higher than room temperature, the start timing of the second dimming process is It is preferable to perform control so as to be later than the start timing of the first dimming process.
- the processing time of the first dimming process it is preferable to control the processing time at a temperature lower than the normal temperature to be longer than the processing time at the normal temperature.
- the processing time of the first dimming process it is preferable to control the processing time at a temperature higher than the normal temperature to be equal to or lower than the processing time at the normal temperature.
- the processing time of the first dimming process basically does not need to change the processing time at normal temperature even if the temperature changes. .
- the processing time of the second dimming process it is preferable to control the processing time of the second dimming process to be shorter than the processing time of the first dimming process at a low temperature. Conversely, at high temperatures, it is preferable to control the processing time of the second dimming process to be longer than the processing time of the first dimming process.
- the processing time of the first dimming process may be set to be equal to or longer than the processing time at room temperature at a low temperature, and the processing time of the first dimming process at room temperature at a high temperature. What is necessary is just to set below processing time.
- the present invention can be suitably used for all types of display devices such as mobile phones, PDAs, personal computers equipped with displays, televisions of various sizes, projectors, and the like.
- Display control device 2 BL unit (backlight) DESCRIPTION OF SYMBOLS 3 1st dimming process part 4 2nd dimming process part 5 Temperature measurement part 21
- Display control apparatus 30 1st dimming process part 40 2nd dimming process part 52 ROM (computer-readable recording medium) 55 LCD panel n frame (first frame) n + 1 frame (second frame) ⁇ 1 brightness (first brightness) ⁇ 2 brightness (second brightness)
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Abstract
Description
(1)液晶表示パネルに光を照射するバックライトの輝度、および上記液晶表示パネルに表示する画像の階調分布を、表示すべき画像の特徴に対応して変化させる表示制御方法であって、
(2)第1のフレームにおける第1の画像データを、上記第1のフレームに続く第2のフレームにおける第2の画像データに変化させる場合に、複数フレーム期間のバックライト輝度変化時間をかけて、上記第1の画像データに対応する第1のバックライト輝度を、上記第2の画像データに対応する第2のバックライト輝度へ、上記バックライトの輝度を変化させる第1のディミング処理と、
(3)複数フレーム期間の階調分布変化時間をかけて、上記第1の画像データに対応する第1の階調分布設定を、上記第2の画像データに対応する第2の階調分布設定に変化させる第2のディミング処理とについて、
(4)少なくとも、上記第2のディミング処理の開始タイミングおよび処理時間を含む第2のディミング期間を、上記液晶表示パネルの温度に応じて制御することを特徴とする。
(1)液晶表示パネルに光を照射するバックライトの輝度、および上記液晶表示パネルに表示する画像の階調分布を、表示すべき画像の特徴に対応して変化させる表示制御装置であって、
(2)第1のフレームにおける第1の画像データを、上記第1のフレームに続く第2のフレームにおける第2の画像データに変化させる場合に、複数フレーム期間のバックライト輝度変化時間をかけて、上記第1の画像データに対応する第1のバックライト輝度を、上記第2の画像データに対応する第2のバックライト輝度へ、上記バックライトの輝度を変化させる第1のディミング処理によって、上記バックライトの輝度を制御する第1のディミング処理部と、
(3)複数フレーム期間の階調分布変化時間をかけて、上記第1の画像データに対応する第1の階調分布設定を、上記第2の画像データに対応する第2の階調分布設定に変化させる第2のディミング処理によって、上記液晶表示パネルの階調分布特性を制御する第2のディミング処理部とを備え、
(4)少なくとも上記第2のディミング処理部は、上記第2のディミング処理の開始タイミングおよび処理時間を含む第2のディミング期間を、上記液晶表示パネルの温度を直接的または間接的に測定する温度計測部を介して取得した上記液晶表示パネルの温度に応じて制御することを特徴とする。
図1は、本発明の表示制御方法に従ったCABC(Contents Adaptive Backlight Control)技術の具体例を低温の場合について示す説明図である。CABCとは、液晶表示パネルに光を照射するバックライトの輝度(以下、BL輝度と略称する)を、従来のように、表示する画像の階調分布特性によらず常時、最大輝度に制御するのではなく、その表示画像に応じてバックライト輝度と階調分布設定とを制御する技術である。
本発明の表示制御方法の特徴は、上記第1のディミング処理の開始タイミングおよび処理時間を含む第1のディミング期間(以下、BL輝度のディミング期間と呼ぶ)と、上記第2のディミング処理の開始タイミングおよび処理時間を含む第2のディミング期間(以下、階調分布設定のディミング期間と呼ぶ)とのうち、少なくとも階調分布設定のディミング期間を上記液晶表示パネルの温度に応じて制御することである。
(表示制御装置の主要構成)
図3は、上記表示制御方法を実行する表示制御装置の一構成例を示すブロック図である。
上記第1のディミング処理部3は、BL輝度のディミング期間決定部31およびBL輝度コントロール部32を備えている。
まず、液晶表示パネルに表示すべき画像のための画像データが、入力画像解析部7に入力される。入力画像解析部7は、例えば全画素について、R(赤)G(緑)B(青)個別の階調の積算値を求めたり、あるいはRGB個別の階調の平均値を求めたりすることによって、入力した画像データを解析する。
図4に、温度に基づく表示制御を行わない表示制御装置90の構成を参考までに示す。表示制御装置90における表示制御装置1との相違点は、温度計測部5および計測温度情報送信部6を備えていない点のみである。
(ディミング期間の決定および表示制御)
まず、図1に示すように、液晶表示パネルにフレームnとして表示すべき画像A(低階調)の画像データが、入力画像解析部7に入力される。入力画像解析部7は、前述したように入力した画像データを解析し、その結果を入力画像判定部8へ出力する。入力画像判定部8は、入力画像解析部7によって解析された結果を元に、画像Aが暗い画像であると判定し、その判定結果を、BL輝度レベル決定部9および階調分布設定決定部10へ出力する。
図2は、上記CABC技術の具体例を常温の場合について示す説明図である。図2に示すように、液晶表示パネルの現在温度が常温の場合、BL輝度のディミング期間および階調分布設定のディミング期間は、(m-1)フレーム期間に設定されている。つまり、常温では、液晶の変化とバックライトの輝度変化とが終了するタイミングがほぼ同じになるように、階調分布設定のディミング期間を調整している。
図5は、本発明の表示制御方法に従ったCABC技術の他の具体例を低温の場合について示す説明図である。
(高温におけるディミング期間)
図6は、本発明の表示制御方法に従ったCABC技術の具体例を高温の場合について示す説明図であり、図7は、上記CABC技術の具体例を常温の場合について示す説明図である。図7は、図2と内容的には同一であるが、横軸(時間軸)の長さが図2より圧縮されている。
図6に示す高温における階調分布設定のディミング期間と、図7に示す常温における階調分布設定のディミング期間とを比較すると、高温における階調分布設定のディミング期間は、常温の場合より長くなっている。
図8は、本発明の表示制御方法に従ったCABC技術の他の具体例を高温の場合について示す説明図である。
(表示制御方法の変更点)
前記実施例1-1~1-3では、BL輝度のディミング期間の開始タイミングと、階調分布設定のディミング期間の開始タイミングとを同時刻に揃えていた。これに対し、本実施例では、階調分布設定のディミング期間の開始タイミングをBL輝度のディミング期間の開始タイミングより早める表示制御について説明する。
図9は、本発明に係る表示制御装置の他の構成例を示すブロック図である。図9に示すように、本実施例の表示制御装置21は、上記第1のディミング処理部3および第2のディミング処理部4に対応する第1のディミング処理部30および第2のディミング処理部40を備えている点において、前記表示制御装置1と相違している。
図10は、BL輝度のディミング期間および階調分布設定のディミング期間のそれぞれの開始タイミングを調整する表示制御方法を示す説明図である。
最後に、表示制御プログラムに従って動作する表示制御装置を備えた液晶表示装置の構成を説明する。図11は、本発明に係る液晶表示装置の全体構成を概略的に示すブロック図である。
2 BLユニット(バックライト)
3 第1のディミング処理部
4 第2のディミング処理部
5 温度計測部
21 表示制御装置
30 第1のディミング処理部
40 第2のディミング処理部
52 ROM(コンピュータ読取可能な記録媒体)
55 液晶表示パネル
n フレーム(第1のフレーム)
n+1 フレーム(第2のフレーム)
Г1 輝度(第1の輝度)
Г2 輝度(第2の輝度)
Claims (13)
- 液晶表示パネルに光を照射するバックライトの輝度、および上記液晶表示パネルに表示する画像の階調分布を、表示すべき画像の特徴に対応して変化させる表示制御方法であって、
第1のフレームにおける第1の画像データを、上記第1のフレームに続く第2のフレームにおける第2の画像データに変化させる場合に、複数フレーム期間のバックライト輝度変化時間をかけて、上記第1の画像データに対応する第1のバックライト輝度を、上記第2の画像データに対応する第2のバックライト輝度へ、上記バックライトの輝度を変化させる第1のディミング処理と、
複数フレーム期間の階調分布変化時間をかけて、上記第1の画像データに対応する第1の階調分布設定を、上記第2の画像データに対応する第2の階調分布設定に変化させる第2のディミング処理とについて、
少なくとも、上記第2のディミング処理の開始タイミングおよび処理時間を含む第2のディミング期間を、上記液晶表示パネルの温度に応じて制御すること
を特徴とする表示制御方法。 - 上記第2のディミング処理の上記処理時間について、上記温度が常温における処理時間より、常温より低い温度での処理時間を短く制御することを特徴とする請求項1に記載の表示制御方法。
- 上記第2のディミング処理の上記処理時間について、上記温度が常温における処理時間より、常温より高い温度での処理時間を長く制御することを特徴とする請求項1または2に記載の表示制御方法。
- 上記第1のディミング処理および上記第2のディミング処理の上記処理時間について、上記温度が常温より低い温度では、上記第2のディミング処理の処理時間を、上記第1のディミング処理の処理時間より短く制御することを特徴とする請求項1から3のいずれか1項に記載の表示制御方法。
- 上記第1のディミング処理および上記第2のディミング処理の上記処理時間について、上記温度が常温より高い温度では、上記第2のディミング処理の処理時間を、上記第1のディミング処理の処理時間より長く制御することを特徴とする請求項1から4のいずれか1項に記載の表示制御方法。
- 上記第1のディミング処理および上記第2のディミング処理の上記開始タイミングについて、上記温度が常温より低い温度では、上記第2のディミング処理の開始タイミングを、上記第1のディミング処理の開始タイミングより早くするように制御することを特徴とする請求項1から5のいずれか1項に記載の表示制御方法。
- 上記第1のディミング処理および上記第2のディミング処理の上記開始タイミングについて、上記温度が常温より高い温度では、上記第2のディミング処理の開始タイミングを、上記第1のディミング処理の開始タイミングより遅くするように制御することを特徴とする請求項1から6のいずれか1項に記載の表示制御方法。
- 上記第1のディミング処理の処理時間について、上記温度が常温より低い温度での処理時間を、上記常温における処理時間以上に制御することを特徴とする請求項2から7のいずれか1項に記載の表示制御方法。
- 上記第1のディミング処理の処理時間について、上記温度が常温より高い温度での処理時間を、上記常温における処理時間以下に制御することを特徴とする請求項2から8のいずれか1項に記載の表示制御方法。
- 液晶表示パネルに光を照射するバックライトの輝度、および上記液晶表示パネルに表示する画像の階調分布を、表示すべき画像の特徴に対応して変化させる表示制御装置であって、
第1のフレームにおける第1の画像データを、上記第1のフレームに続く第2のフレームにおける第2の画像データに変化させる場合に、複数フレーム期間の輝度変化時間をかけて、上記第1の画像データに対応する第1の輝度を、上記第2の画像データに対応する第2の輝度へ、上記バックライトの輝度を変化させる第1のディミング処理によって、上記バックライトの輝度を制御する第1のディミング処理部と、
複数フレーム期間の階調分布変化時間をかけて、上記第1の画像データに対応する第1の階調分布設定を、上記第2の画像データに対応する第2の階調分布設定に変化させる第2のディミング処理によって、上記液晶表示パネルの階調分布設定を制御する第2のディミング処理部とを備え、
少なくとも上記第2のディミング処理部は、上記第2のディミング処理の開始タイミングおよび処理時間を含む第2のディミング期間を、上記液晶表示パネルの温度を直接的または間接的に測定する温度計測部を介して取得した上記液晶表示パネルの温度に応じて制御すること
を特徴とする表示制御装置。 - 請求項10に記載の表示制御装置を備えたことを特徴とする液晶表示装置。
- コンピュータを請求項10に記載の表示制御装置における上記第1のディミング処理部および第2のディミング処理部として機能させることを特徴とする表示制御プログラム。
- 請求項12に記載の表示制御プログラムを格納したことを特徴とするコンピュータ読取可能な記録媒体。
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CN201180029085.0A CN102959613B (zh) | 2010-08-03 | 2011-07-27 | 显示控制方法、显示控制装置及液晶显示装置 |
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