WO2011021663A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2011021663A1 WO2011021663A1 PCT/JP2010/064000 JP2010064000W WO2011021663A1 WO 2011021663 A1 WO2011021663 A1 WO 2011021663A1 JP 2010064000 W JP2010064000 W JP 2010064000W WO 2011021663 A1 WO2011021663 A1 WO 2011021663A1
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- video display
- liquid crystal
- display area
- control unit
- light emitting
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0232—Special driving of display border areas
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- 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
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/02—Graphics controller able to handle multiple formats, e.g. input or output formats
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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
Definitions
- the present invention relates to a liquid crystal display device that variably controls an image display area of a liquid crystal panel and displays an image in the image display area.
- liquid crystal display devices that variably control the image display area of a liquid crystal panel have been proposed in order to save power and to view images comfortably.
- a user wants to enjoy a realistic video, for example, when watching a sports program or a movie, the viewer displays the video on the entire liquid crystal panel of the large-screen liquid crystal display device.
- the video is displayed as a sub-screen in a limited video display area of the liquid crystal panel to save power.
- a light emitting element such as an LED (Light Emitting Diode) is used as a backlight light source for illuminating the liquid crystal panel, as in the image display device disclosed in Patent Document 1.
- the LED of the backlight source corresponding to the video display area is turned on so as to illuminate the changed video display area. It has a so-called local dimming function that turns off the LED of the backlight source corresponding to the outside of the video display area.
- FIG. 10 is a diagram for explaining a problem in displaying an image on a limited image display area of a liquid crystal panel provided in a conventional liquid crystal display device.
- FIG. 10A is a diagram showing a state where an image related to the input image data is displayed in the limited image display area 101 of the liquid crystal panel 100.
- a liquid crystal drive control unit (not shown) of the liquid crystal display device controls the voltage applied to the liquid crystal pixels in the video display area 101 so that the video is displayed in the video display area 101.
- the liquid crystal drive control unit controls the voltage applied to the liquid crystal pixels outside the video display area 102 so that a black image is displayed outside the small-screen video display area (hereinafter referred to as the video display area) 102. Yes.
- FIG. 10B is a diagram showing a light emission state of the backlight unit 110 that illuminates the liquid crystal panel 100 displaying an image.
- the backlight unit 110 includes a plurality of light-emitting elements indicated by circles C that illuminate the liquid crystal panel 100, and these light-emitting elements are arranged in a matrix immediately below the liquid crystal panel 100.
- the backlight unit 110 is a so-called direct backlight that is disposed so as to overlap the back surface of the liquid crystal panel 100.
- a state where the light emitting element is turned on is indicated by a white circle, and a state where the light emitting element is turned off is indicated by a gray circle.
- the light emission control unit (not shown) of the backlight unit 110 can individually control the luminance value of each light emitting element.
- the light emission control unit controls the luminance value of the light emitting element of the backlight unit 110 so that only the video display area 101 is illuminated.
- the vertical width L1 and the horizontal width W1 of the video display area 101 and the illumination area of the light emitting element (white circle) that illuminates the video display area 101 in the backlight unit 110 are equal, and the video display area 101 and the illumination area 111 overlap without protruding.
- FIG. 10C is a graph of the apparent brightness (luminance, illuminance) of the liquid crystal panel 100 displaying an image, and the aperture ratio of the liquid crystal pixel (dotted line P) in FIG.
- the transmittance graph and the luminance value graph of the light emitting element of the backlight unit 110 are shown, and the lower part of the luminance value graph shows the lighting state of the light emitting element.
- the aperture ratio of the liquid crystal pixels outside the video display area 102 is set to zero.
- the light from the light emitting element emitting light corresponds to the light emitting element being turned off. So-called light leakage that leaks into the region occurs.
- the light transmittance cannot be reduced from the liquid crystal characteristics, that is, the light cannot be completely blocked. A part of the light due to the light leakage is transmitted from the liquid crystal pixels outside the image display area 102.
- the illumination area of the backlight unit 110 that illuminates the video display area 101 is wider than the video display area 101, and the outside of the video display area 101 may be illuminated.
- a plurality of adjacent light emitting elements are collectively controlled to emit light (block light emission control). This may occur when the number of light emitting elements of the backlight unit 110 is small.
- FIG. 12A is a diagram illustrating a light emission state of the backlight unit 120 when the illumination area of the backlight unit 120 is wider than the video display area 101. Assume that a video display area 101 having a vertical width L1 and a horizontal width W1 is displayed at the center of the liquid crystal panel 100 as shown in FIG.
- FIG. 12B is a diagram showing a light emission state of the backlight unit 120 that illuminates the liquid crystal panel 100.
- FIG. 12C shows from the top a graph of the apparent brightness of the liquid crystal panel 100 displaying an image, a graph of the aperture ratio of the liquid crystal pixel, and the backlight along the one-dot chain line P in FIG.
- the graph of the luminance value of the light emitting element of the unit 120 is shown, and the lower portion of the luminance value graph shows the lighting state of the light emitting element.
- the vertical width L2 and the horizontal width W2 of the illumination area 121 of the light emitting element that illuminates the video display area 101 are larger than the vertical width L1 and the horizontal width W1 of the video display area 101. Not only the area 101 but also the area near the outside of the video display area is illuminated.
- the light emitting element also illuminates the outside of the video display area 101, and further light leakage occurs, so that the dark surrounding area 104 becomes blurry and the viewer is likely to have the above-mentioned uncomfortable feeling.
- the present invention has been made in view of such circumstances, and an object of the present invention is to reduce a viewer's discomfort due to light leakage in a liquid crystal display device having a local dimming function.
- the first technical means includes a liquid crystal panel for displaying video data, a backlight unit provided with a plurality of light emitting elements for illuminating the liquid crystal panel, and a video as a sub-screen in a limited video display area of the liquid crystal panel.
- the liquid crystal display device comprising: a video display control unit that displays a light source; and a backlight control unit that controls a light emission luminance of a light emitting element of the backlight unit corresponding to the control of the video display control unit.
- the control unit controls the aperture ratio of the liquid crystal pixels outside the sub-screen video display area to a predetermined value, and the backlight control unit controls the outside of the sub-screen video display area in response to the control of the video display control unit.
- the luminance value of the light emitting element to illuminate is controlled to a predetermined value, the aperture ratio of the liquid crystal pixels outside the sub-screen video display area by the video display control unit, and the sub-unit by the backlight control unit.
- the correlation between the luminance values of the light-emitting element that illuminates the face image display area outside, a liquid crystal display device and controls the brightness outside the child screen video display area to a predetermined value.
- the brightness outside the small-screen video display area is controlled only by controlling the aperture ratio of the liquid crystal pixels outside the small-screen video display area by the video display control unit.
- the control is performed only by controlling the luminance value of the light emitting element that illuminates the outside of the small-screen image display area by the backlight control unit.
- a third technical means is the first or second technical means, wherein the control of the aperture ratio of the liquid crystal pixels outside the sub-screen video display area by the video display control unit is to illuminate the outside of the sub-screen video display area.
- the brightness value of the light emitting element and / or the brightness value of the light leakage of light emitted by the light emitting element for illuminating the display image in the video display area is controlled.
- the control of the aperture ratio of the portion of the liquid crystal pixel corresponding to the area illuminated by the light leakage is gradually performed as the distance from the video display area increases at least for a certain interval. Contrary to the decreasing brightness value change of the light leakage, the control is performed so as to gradually increase as the distance from the video display area increases.
- the luminance outside the small-screen video display area of the liquid crystal panel is a constant value or the luminance is from the video display area for at least a certain interval. Control of the aperture ratio of the liquid crystal pixel by the video display control unit and / or control of the luminance value of the light emitting element by the backlight control unit is performed so as to gradually decrease as the distance increases.
- the backlight control unit controls a luminance value of the light emitting element.
- a seventh technical means is the first or second technical means, wherein the backlight control unit emits a light emitting element corresponding to the video display area to illuminate a display video of the video display area, or The light emitting element corresponding to the video display area and the light emitting element corresponding to the outer vicinity area of the video display area emit light.
- the backlight control unit emits light emitting elements corresponding to the inner area of the video display area in order to illuminate the display video of the video display area. It is characterized by doing.
- a ninth technical means includes a storage unit that stores background image data to be displayed outside the small-screen video display area in the first or second technical means, and the video display control unit includes the small-screen video display The background image data of the storage unit is displayed outside the area.
- the present invention in a liquid crystal display device having a local dimming function, by controlling the aperture ratio of the liquid crystal pixel and the luminance value of the light emitting element, it is possible to reduce the viewer's uncomfortable feeling due to light leakage.
- FIG. 1 is an example of a functional block diagram of a liquid crystal display device according to the present invention.
- the liquid crystal display device 1 includes a video processing unit 11, a video display control unit 12, a liquid crystal drive unit 13, a backlight control unit 14, a backlight drive unit 15, a liquid crystal panel 16, a backlight unit 17, a control unit 18, and a memory 19. Composed.
- the video processing unit 11 performs various video processes such as a color space conversion process, a ⁇ correction process, and a color correction process on the input video data, and outputs the video data subjected to the various video processes to the video display control unit 12. To do. Further, as described above, when displaying a video as a sub-screen in a limited video display area (hereinafter referred to as a video display area) of the liquid crystal panel 16, video data corresponding to the video display area is generated, The generated video data is output to the video display control unit 12.
- a video display area a limited video display area
- the video display control unit 12 generates a control signal (image signal) for controlling the liquid crystal driving unit 13 and the backlight control unit 14 so that the video related to the video data from the video processing unit 11 is displayed on the liquid crystal panel 16.
- the generated control signal is output to the liquid crystal drive unit 13 and the backlight control unit 14.
- the video display control unit 12 controls the liquid crystal driving unit 13 and the backlight control unit 14 so that the video is displayed in the video display area when the video is displayed in the video display area of the liquid crystal panel 16.
- a signal is generated, and the generated control signal is output to the liquid crystal drive unit 13 and the backlight control unit 14.
- the video display control unit 12 generates a control signal (image signal) for controlling the aperture ratio of the liquid crystal pixels outside the video display area for displaying the video (hereinafter referred to as the outside of the video display area) to a predetermined value.
- the generated control signal is output to the liquid crystal drive unit 13. Details will be described later.
- the liquid crystal drive unit 13 outputs the gradation data and signal line control signal output to the source driver (not shown) and the gate driver (not shown) based on the control signal output from the video display control unit 12.
- a scanning line control signal is generated, the aperture ratio of the liquid crystal pixels of the liquid crystal panel 16 is controlled, and an image is displayed on the liquid crystal panel 16.
- the backlight control unit 14 outputs a backlight drive signal for controlling the luminance value of the light emitting element of the backlight unit 17 to the backlight drive unit 15 in response to the control signal output by the video display control unit 12.
- the backlight control unit 14 displays an image on the image display area of the liquid crystal panel 16
- the backlight control unit 14 sets the luminance value of the light emitting element that illuminates the outside of the image display area to a predetermined value corresponding to the control of the image display control unit 12.
- a backlight drive signal to be controlled is generated and output to the backlight drive unit 15. Details will be described later.
- the backlight drive unit 15 controls the luminance value of each light emitting element of the backlight unit 17 based on the backlight drive signal.
- the liquid crystal panel 16 includes an upper glass substrate, a lower glass substrate, a liquid crystal layer sandwiched between these glass substrates, a polarizing plate for polarizing light, and the like.
- a polarizing plate for polarizing light and the like.
- R (red), G (green), and B (blue) color filters are arranged, and various shades are expressed by combinations of color shades according to the amount of light transmitted through each liquid crystal pixel. be able to.
- the backlight unit 17 includes a plurality of light emitting elements that illuminate the liquid crystal panel 16, and these light emitting elements are arranged in a matrix form immediately below the liquid crystal panel 16.
- the backlight unit 17 is a so-called direct-type backlight disposed so as to overlap the back surface of the liquid crystal panel 16, but may be a backlight that is not a direct-type.
- a diffusion plate and a prism sheet (not shown) are provided between the liquid crystal panel 16 and the backlight unit 17. The diffusion plate scatters and diffuses the illumination light from the backlight unit 17 to make the entire display region uniform brightness.
- the prism sheet improves the luminance of the illumination light from the backlight unit 17.
- the control unit 18 controls each functional block, and the memory 19 stores various control information.
- the liquid crystal display device 1 has an aperture ratio of liquid crystal pixels outside the video display area controlled by the video display control unit 12 and a luminance value of a light emitting element that illuminates the outside of the video display area controlled by the backlight control unit 14.
- the luminance outside the video display area is controlled to a predetermined value by the mutual relationship.
- the video display area is controlled only by the control of the aperture ratio of the liquid crystal pixels outside the video display area by the video display control section 12 or the control of the luminance value of the light emitting element that illuminates the outside of the video display area by the backlight control section 14.
- the external brightness can be controlled to a predetermined value.
- the video display control unit 12 controls the aperture ratio of the liquid crystal pixels outside the video display area corresponding to the luminance value of light leakage of light emitted from the light emitting element for illuminating the display video in the video display area. And / or the aperture ratio of the liquid crystal pixels outside the video display area may be controlled corresponding to the luminance value of the light emitting element that illuminates the outside of the video display area.
- the image display control unit 12 displays the aperture ratio of the liquid crystal pixels in the portion of the liquid crystal panel 16 (hereinafter referred to as a light leakage corresponding region) corresponding to the region illuminated by the light leakage for at least a certain interval.
- a light leakage corresponding region the aperture ratio of the liquid crystal pixels in the portion of the liquid crystal panel 16 (hereinafter referred to as a light leakage corresponding region) corresponding to the region illuminated by the light leakage for at least a certain interval.
- control is performed such that the distance gradually increases as the distance from the image display area increases.
- FIG. 2A is a diagram showing a state in which an image related to input video data is displayed in the video display area 51 of the liquid crystal panel 16 when the present invention is applied, and 52 is an area side of the video display area 51. 53 indicates the outside of the video display area.
- FIG. 2B is a graph of the apparent brightness (luminance, illuminance) of the liquid crystal panel 16 displaying an image and the aperture ratio of the liquid crystal pixel on the alternate long and short dash line P in FIG.
- the luminance value graph of the light emitting element of the backlight unit 17 and the luminance value graph, the lighting state of the light emitting element is shown.
- the dot D shown in the luminance value graph of the light emitting element indicates light leakage, and the luminance value of the light leakage changes so as to gradually decrease as the distance from the image display area increases. Note that the graph and the like illustrated in FIG. 2C are the same as the graph and the like illustrated in FIG.
- the video display control unit 12 controls the aperture ratio of the liquid crystal pixels on the area side 52 of the video display area 51 to a first predetermined aperture ratio (for example, 0), as indicated by reference numeral X11 in FIG. Further, the video display control unit 12, as indicated by reference numeral X 12 in the figure, the brightness of the light leakage that gradually decreases as the distance from the video display region 51 increases the aperture ratio of the liquid crystal pixels in the light leakage corresponding region 53 outside the video display region 53. Contrary to the value change (see dot D), the distance is gradually increased until the second predetermined aperture ratio (for example, A1) is reached as the distance from the video display area 51 increases. Then, the video display control unit 12 controls the aperture ratio of the liquid crystal pixels in a region other than the light leakage corresponding region outside the video display region 53 to be constant as indicated by reference numeral X13 in FIG.
- a first predetermined aperture ratio for example, 0
- the video display control unit 12 controls the aperture ratio of the liquid crystal pixels on the area side 52 of the video display
- the backlight control unit 14 also sets the luminance value of the light emitting element R11 that illuminates the outside of the video display area 53 and the luminance value of the light emitting element R12 that illuminates the video display area 51, as indicated by reference numeral X14 in FIG. Control to a third predetermined luminance value (for example, B1) equal to or less than the value.
- a third predetermined luminance value for example, B1
- the apparent brightness (luminance) outside the video display area 53 becomes a constant value. As a result, it appears as if a uniform gray image is displayed, so that light leakage is not noticeable.
- the apparent brightness outside the video display area 53 can be made constant.
- the video display control unit 12 first sets the aperture ratio of the liquid crystal pixels in the region side 52 of the video display area 51 and the aperture ratio of the liquid crystal pixels outside the video display area 53, as indicated by reference numeral X15 in FIG.
- the aperture ratio (for example, 0) is controlled.
- the backlight control unit 14 sets the luminance value of the outer light emitting element R13 of the light emitting element R12 that illuminates the video display region 51 to a fourth predetermined luminance that is equal to or lower than the luminance value of the light emitting element R12. Control to a value (eg, 0). Further, as indicated by the same symbol X17, the backlight control unit 14 sets the luminance value of the light emitting element R14 outside the outer light emitting element R13 to a third predetermined luminance value (for example, higher than the fourth predetermined luminance value). B1).
- the apparent brightness outside the video display area 53 can be made constant, and light leakage can be made inconspicuous.
- FIG. 3A is a diagram showing a state in which an image that borders the peripheral area of the video display area 51 (hereinafter referred to as a border image) is displayed on the liquid crystal panel 16, and reference numeral 54 denotes the border image display area.
- FIG. 3B shows an apparent brightness graph, an aperture ratio graph of a liquid crystal pixel, a luminance value graph of a light emitting element, and a lighting state of the light emitting element, similarly to the graph of FIG. 2B. .
- the video display control unit 12 controls the aperture ratio of the liquid crystal pixels on the area side 52 of the video display area 51 to a first predetermined aperture ratio (for example, 0), as indicated by reference numeral X21 in FIG. . Further, the video display control unit 12 reverses the aperture ratio of the liquid crystal pixel in the light leakage corresponding area outside the video display area 53 to the luminance value change of the light leakage (see dot D), as indicated by reference numeral X22 in FIG. In addition, as the distance from the video display area 51 increases, the second predetermined aperture ratio (for example, A1) is gradually increased. Then, the video display control section 12 controls the aperture ratio of the liquid crystal pixels in the area other than the light leakage corresponding area outside the video display area 53 to the first predetermined aperture ratio as indicated by reference numeral X23 in FIG. .
- a first predetermined aperture ratio for example, 0
- the video display control unit 12 reverses the aperture ratio of the liquid crystal pixel in the light leakage corresponding area outside the video display area 53 to the lumina
- the backlight control unit 14 sets the luminance value of the light emitting element R21 that illuminates the outside of the video display area 53 to a fourth value that is lower than the luminance value of the light emitting element R22 that illuminates the video display area 51. Control to a predetermined luminance value (for example, 0). Since the luminance value of light leakage indicated by the dot D ′ corresponding to the outside 53 of the video display area is very small (below natural light), it is blocked by controlling the aperture ratio of the liquid crystal pixels of the liquid crystal panel 16 and affects the apparent brightness. Does not reach.
- FIG. 3 (B) shows the correlation between the aperture ratio of the liquid crystal pixels outside the video display area controlled by the video display control unit 12 and the luminance value of the light emitting element that illuminates the outside of the video display area controlled by the backlight control unit 14. ),
- the brightness (luminance) of the border image display area 54 becomes a constant value.
- the peripheral area of the video display area 51 appears to be bordered, so that light leakage becomes inconspicuous.
- FIG. 4A is a diagram showing a state in which a gradation image appears to be displayed outside the video display area 53
- FIG. 4B is an apparent brightness as in the graph of FIG. 2B. The graph of this, the graph of the aperture ratio of a liquid crystal pixel, the graph of the luminance value of a light emitting element, and the lighting state of the light emitting element are shown.
- the video display control unit 12 controls the aperture ratio of the liquid crystal pixels on the area side 52 of the video display area 51 to a first predetermined aperture ratio (for example, 0), as indicated by reference numeral X31 in FIG. . Further, the video display control unit 12 reverses the aperture ratio of the liquid crystal pixel in the light leakage corresponding area outside the video display area 53 to the luminance value change of light leakage (see dot D), as indicated by reference numeral X32 in FIG. In addition, as the distance from the video display area 51 increases, the second predetermined aperture ratio (for example, A1) is gradually increased.
- a first predetermined aperture ratio for example, 0
- the video display control unit 12 reverses the aperture ratio of the liquid crystal pixel in the light leakage corresponding area outside the video display area 53 to the luminance value change of light leakage (see dot D), as indicated by reference numeral X32 in FIG.
- the second predetermined aperture ratio for example, A1
- the video display control unit 12 then increases the aperture ratio of the liquid crystal pixels in the area other than the light leakage corresponding area 53 outside the video display area 53 as the distance from the video display area 51 increases as shown in FIG. Control is performed so as to gradually decrease from a predetermined aperture ratio.
- the backlight control unit 14 sets the luminance value of the light emitting element R31 that illuminates the outside of the video display area 53 and the luminance value of the light emitting element R32 that illuminates the video display area 51, as indicated by reference numeral X34 in FIG. Control to a third predetermined luminance value (for example, B1) equal to or less than the value.
- a third predetermined luminance value for example, B1
- the backlight control unit 14 uses the luminance value of each light emitting element R31 that illuminates the outside of the video display area 53 and the light emitting element that illuminates the video display area 51, as indicated by reference numeral X35 in FIG. You may control so that it may reduce gradually as it distances from R32.
- FIG. 5 is another functional block diagram of the liquid crystal display device according to the present invention.
- the same blocks as those in the functional block diagram of FIG. The description is omitted.
- the backlight control unit 14 ′ inevitably displays the image, for example, the light emission control is block control or the number of light emitting elements is small.
- the liquid crystal aperture ratio and the luminance value that makes the light leakage inconspicuous when the area near the outside of the area is also illuminated will be described.
- FIG. 6A is a diagram showing a state in which an image related to the input image data is displayed in the image display area 51 of the liquid crystal panel 16.
- Reference numeral 55 denotes a region near the outside of the video display region 51 (hereinafter referred to as an illumination region) that is illuminated by the light emitting element R41 (see FIG. 6B) that illuminates the video display region 51.
- Reference numeral 56 denotes an area outside the video display area 53 that is not illuminated by the light emitting element R41 that illuminates the video display area 51 (hereinafter referred to as an illumination area outside).
- the video display area outside 53 is a combination of the illumination area 55 and the illumination area outside 56.
- 6B and 6C are similar to the graph of FIG. 2B, the apparent brightness graph, the aperture ratio graph of the liquid crystal pixel, the luminance value graph of the light-emitting element, Indicates the lighting state.
- the video display control unit 12 ′ as indicated by reference numeral X41 in FIG. 6B, the aperture ratio of the liquid crystal pixels in the region side 52 of the video display region 51 and the aperture of the liquid crystal pixels in the illumination region 55 outside the video display region 53.
- the rate is controlled to a first predetermined aperture ratio (for example, 0).
- the video display control unit 12 ′ reverses the aperture ratio of the liquid crystal pixel in the light leakage corresponding area outside the illumination area 56 to the luminance value change of the light leakage (see dot D), as indicated by reference numeral X42 in FIG.
- the second predetermined aperture ratio for example, A1
- the image display control unit 12 ′ controls the aperture ratio of the liquid crystal pixels in the area other than the light leakage corresponding area outside the illumination area 56 to a second predetermined aperture ratio as indicated by reference numeral X43 in FIG. .
- the control unit 18 calculates the coordinate value of the illumination area 55 outside the video display area 53 based on the coordinate value of the video display area 51 and the coordinate value of the illumination range of the light emitting element that irradiates the video display area 51. May be.
- the coordinate value of the illumination area 55 outside the video display area 53 may be stored in the memory 19 in advance.
- the video display control unit 12 ′ refers to the coordinate value of the illumination area 55 and identifies the liquid crystal pixel that controls the aperture ratio.
- the backlight control unit 14 ′ sets the luminance value of the light emitting element R42 that illuminates the illumination area outside 56 outside the image display area 53, the image display area 51, and the illumination, as indicated by reference numeral X44 in FIG. It controls to the 3rd predetermined
- B1 3rd predetermined
- the apparent brightness outside the video display area 53 can be made constant.
- the video display control unit 12 ′ first sets the aperture ratio of the liquid crystal pixels on the area side 52 of the video display area 51 and the aperture ratio of the liquid crystal pixels outside the video display area 53 as indicated by reference numeral X45 in FIG. Control to a predetermined aperture ratio (for example, 0).
- the backlight control unit 14 ′ sets the luminance value of the outer light emitting element R43 of the light emitting element R41 that illuminates the video display area 51 and the illumination area 55 to be equal to or lower than the luminance value of the light emitting element R41. Control to a fourth predetermined luminance value (for example, 0). Further, as indicated by the same reference numeral X47, the backlight control unit 14 ′ sets the luminance value of the light emitting element R44 outside the outer light emitting element R43 to a third predetermined luminance value (for example, higher than the fourth predetermined luminance value). , B1).
- FIG. 7A shows a state in which a border image is displayed on the liquid crystal panel 16, and a gray border image display region 54 is provided outside the video display region 51.
- FIG. 7B shows an apparent brightness graph, an aperture ratio graph of a liquid crystal pixel, a luminance value graph of a light emitting element, and a lighting state of the light emitting element, similarly to the graph of FIG. .
- the video display control unit 12 ′ as indicated by reference numeral X51 in FIG. 7B, the aperture ratio of the liquid crystal pixels in the region side 52 of the video display region 51 and the aperture of the liquid crystal pixels in the illumination region 55 outside the video display region 53.
- the rate is controlled to a first predetermined aperture ratio (for example, 0).
- the video display control unit 12 ′ reverses the aperture ratio of the liquid crystal pixels in the light leakage corresponding area outside the illumination area 56 to the luminance value change of the light leakage (see dot D), as indicated by reference numeral X52 in FIG.
- the second predetermined aperture ratio for example, A1
- the video display control unit 12 ′ controls the aperture ratio of the liquid crystal pixels in the area other than the light leakage corresponding area outside the illumination area 56 to a first predetermined aperture ratio as indicated by reference numeral X 53 in FIG. .
- the backlight control unit 14 ′ uses the luminance value of the light emitting element R 52 that illuminates the outside of the illumination area 56, and the light emission that illuminates the video display area 51 and the illumination area 55, as indicated by reference numeral X 54 in FIG.
- the fourth predetermined luminance value (for example, 0) is controlled to be equal to or lower than the luminance value of the element R51.
- the brightness of the border image display area 54 is constant, and an image bordering the peripheral area of the video display area 51 is displayed.
- the light leakage is less noticeable.
- FIG. 8A is a diagram showing a state in which a gradation image appears to be displayed outside the video display area 53
- FIG. 8B is an apparent brightness as in the graph of FIG. The graph of this, the graph of the aperture ratio of a liquid crystal pixel, the graph of the luminance value of a light emitting element, and the lighting state of the light emitting element are shown.
- the video display control unit 12 ′ as indicated by reference numeral X61 in FIG. 8B, the aperture ratio of the liquid crystal pixels in the region side 52 of the video display region 51 and the aperture of the liquid crystal pixels in the illumination region 55 outside the video display region 53.
- the rate is controlled to a first predetermined aperture ratio (for example, 0).
- the video display control unit 12 ′ reverses the aperture ratio of the liquid crystal pixels in the light leakage corresponding area outside the illumination area 56 to the luminance value change of the light leakage (see dot D), as indicated by reference numeral X62 in FIG.
- the second predetermined aperture ratio for example, A1 is gradually increased.
- the video display control unit 12 ′ increases the aperture ratio of the liquid crystal pixels in the area other than the light leakage corresponding area outside the illumination area 56 as the distance from the video display area 51 increases, as indicated by reference numeral X 63 in FIG. Control is performed so as to gradually decrease from a predetermined aperture ratio.
- the backlight control unit 14 ′ sets the luminance value of the light emitting element R62 that illuminates the illumination area outside 56 outside the image display area 53, the image display area 51, and the illumination, as indicated by reference numeral X64 in FIG. It controls to the 3rd predetermined
- B1 3rd predetermined
- the backlight control unit 14 ′ uses the luminance value of each light emitting element that illuminates the illumination area outside 56 outside the image display area 53, as indicated by reference numeral X 65 in FIG. It may be controlled to gradually decrease as the distance from the light emitting element R61 that illuminates is increased.
- FIG. 9A is a diagram illustrating a state in which an image displayed on the liquid crystal panel 16 is displayed when the illumination area is smaller than the image display area 51.
- 9B and 9C are similar to the graph of FIG. 2B, the apparent brightness graph, the aperture ratio graph of the liquid crystal pixel, the luminance value graph of the light-emitting element, Indicates the lighting state.
- the video display control unit 12 (or the video display control unit 12 ′), as indicated by reference numeral X71 in FIG. 9B, the aperture ratio of the liquid crystal pixels on the region side 52 of the video display region 51 and the outside of the video display region 53.
- the aperture ratio of the liquid crystal pixel is controlled to a first predetermined aperture ratio (for example, 0).
- the backlight control unit 14 corresponds to the inner area of the video display area 51 in order to illuminate the display video of the video display area 51 as indicated by reference numeral X72 in FIG.
- the light emitting element R71 to emit light is caused to emit light.
- the backlight control unit 14 sets the luminance value of the light emitting element R72 corresponding to the region other than the inner region of the video display region 51 to a fourth predetermined luminance value (for example, 0). ) To control.
- the backlight control unit 14 controls the luminance value of the light emitting element R72 to a third predetermined luminance value (for example, B1) as indicated by reference numeral X73 in FIG. May be.
- the size of the video display area 51 may be controlled so that the area side 52 of the video display area 51 is located between the light emitting elements.
- the above control is particularly effective when the number of light emitting elements is small and the space between the light emitting elements is wide, as shown in the lighting state of the light emitting elements in FIG.
- the video display control unit 12 is arranged between the light emitting element R73 that illuminates the video display area 51 and the outer light emitting element R74 of the light emitting element R73. The size of the video display area 51 is changed so that 52 is located.
- the aperture ratio A1 and the backlight luminance value B1 of the liquid crystal pixel can be adjusted, and the backlight luminance value B1 may be decreased and the aperture ratio A1 of the liquid crystal pixel may be increased for energy saving.
- a white LED optimal for liquid crystal panel illumination can be used.
- background image data to be displayed outside the video display area 53 (border image display area 54) is stored in the memory 19 (storage section), and the video display control section 12 stores the background image data in the memory 19 outside the video display area 53.
- the background image data may be displayed.
- a border image may be displayed (see FIG. 3) together with a gray image (see FIG. 2) or a gradation image (see FIG. 4).
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Abstract
Description
図10(A)は、液晶パネル100の限定された映像表示領域101に入力映像データに係る映像を表示している状態を示した図である。液晶表示装置の液晶駆動制御部(図示せず)は、映像表示領域101に映像が表示されるように映像表示領域101の液晶画素に印可する電圧を制御している。また、液晶駆動制御部は、子画面映像表示領域外(以下、映像表示領域外と記す)102に黒画像が表示されるように映像表示領域外102の液晶画素に印可する電圧を制御している。
バックライトユニット110は、液晶パネル100を照明する複数の丸Cで示す発光素子を有し、これらの発光素子は液晶パネル100の直下にマトリクス状に配設されている。バックライトユニット110は、液晶パネル100の背面に重なるように配設される、いわゆる直下式バックライトである。なお、発光素子が点灯している状態を白丸で示し、消灯している状態をグレイ丸で示す。
図1は、本発明に係る液晶表示装置の機能ブロック図の一例である。
液晶表示装置1は、映像処理部11、映像表示制御部12、液晶駆動部13、バックライト制御部14、バックライト駆動部15、液晶パネル16、バックライトユニット17、制御部18、メモリ19から構成される。
また、映像表示制御部12は、液晶パネル16の映像表示領域に映像を表示する場合、映像がこの映像表示領域に表示されるように、液晶駆動部13及びバックライト制御部14を制御する制御信号を生成し、生成した制御信号を液晶駆動部13及びバックライト制御部14に出力する。このとき、映像表示制御部12は、映像を表示する映像表示領域の外側(以下、映像表示領域外と記す)の液晶画素の開口率を所定値に制御する制御信号(画像信号)を生成し、生成した制御信号を液晶駆動部13に出力する。なお、詳細については後述する。
また、バックライト制御部14は、液晶パネル16の映像表示領域に映像を表示する場合、映像表示制御部12の制御に対応して、映像表示領域外を照明する発光素子の輝度値を所定値に制御するバックライト駆動信号を生成し、バックライト駆動部15に出力する。なお、詳細については後述する。
なお、液晶パネル16とバックライトユニット17との間には、図示しない拡散板とプリズムシートが設けられる。拡散板は、バックライトユニット17からの照明光を散乱、拡散させ、表示領域全体を均一な明るさにする。プリズムシートは、バックライトユニット17からの照明光の輝度を向上させる。
実施例1では、まず、図10に示したように、バックライト制御部14が、映像表示領域の表示映像を照明するために、当該映像表示領域に対応する発光素子を発光する場合を例示して説明する。
図3(A)は、液晶パネル16に、映像表示領域51の周辺領域を縁取る画像(以下、縁取画像と記す)を表示している状態を示す図で、54は縁取画像表示領域を示している。
図3(B)は、図2(B)のグラフと同様に、見た目の明るさのグラフ、液晶画素の開口率のグラフ、発光素子の輝度値のグラフ、発光素子の点灯状態を示している。
なお、映像表示領域外53に対応する、ドットD’に示す光漏れの輝度値は微少(自然光以下)なので、液晶パネル16の液晶画素の開口率制御により遮断され、見た目の明るさに影響を及ぼさない。
図4(A)は、映像表示領域外53にグラデーション画像が表示されているように見える状態を示す図で、図4(B)は、図2(B)のグラフと同様に、見た目の明るさのグラフ、液晶画素の開口率のグラフ、発光素子の輝度値のグラフ、発光素子の点灯状態を示している。
図5は、本発明に係る液晶表示装置の他の機能ブロック図で、同液晶表示装置1’の機能ブロックのうち、図1の機能ブロック図と同じブロックについては、同一の符号を付してその説明を省略する。
映像表示制御部12’は、図6(C)の符号X45に示すように、映像表示領域51の領域辺52の液晶画素の開口率及び映像表示領域外53の液晶画素の開口率を第1所定の開口率(例えば、0)に制御する。
図7(A)は、液晶パネル16に、縁取画像を表示している状態を示す図で、映像表示領域51の外側にグレイ色の縁取画像表示領域54がある。
図7(B)は、図2(B)のグラフと同様に、見た目の明るさのグラフ、液晶画素の開口率のグラフ、発光素子の輝度値のグラフ、発光素子の点灯状態を示している。
他にも、液晶パネル16の映像表示領域51を照明するバックライトユニット17の照明領域を、映像表示領域51よりも小さくして、光漏れを目立たなくしてもよい。
図9(A)は、照明領域を映像表示領域51よりも小さくした場合に、液晶パネル16に表示される映像を表示している状態を示す図である。図9(B)、図9(C)は、図2(B)のグラフと同様に、見た目の明るさのグラフ、液晶画素の開口率のグラフ、発光素子の輝度値のグラフ、発光素子の点灯状態を示している。
なお、バックライト制御部14(又は、バックライト制御部14’)は、同図符号X73に示すように、発光素子R72の輝度値を、第3所定の輝度値(例えば、B1)に制御してもよい。
上記の制御は、特に、図9(C)の発光素子の点灯状態に示しているように、発光素子の数が少なく、発光素子間が広い場合に有効である。
映像表示制御部12は、図9(C)に示すように、映像表示領域51を照明する発光素子R73と、この発光素子R73の外側発光素子R74との間に、映像表示領域51の領域辺52が位置するように映像表示領域51の大きさを変更する。
液晶画素の開口率A1、バックライト輝度値B1の値は調整可能であり、省エネのためバックライト輝度値B1を下げ、液晶画素の開口率A1を上げても良い。
発光素子として、液晶パネル照明に最適な白色LED等を利用することができる。
映像表示領域外53や縁取画像表示領域54に、装飾画像が表示されるように、各領域の液晶画素の開口率を制御してもよい。具体的には、映像表示領域外53(縁取画像表示領域54)に表示する背景画像データをメモリ19(記憶部)に記憶し、映像表示制御部12が、映像表示領域外53にメモリ19の前記背景画像データを表示すればよい。
グレイ色画像の表示(図2参照)、又は、グラデーション画像の表示(図4参照)と共に、縁取画像を表示してもよい(図3参照)。
Claims (9)
- 映像データを表示する液晶パネルと、当該液晶パネルを照明する複数の発光素子を配設したバックライトユニットと、前記液晶パネルの限定された映像表示領域に子画面として映像を表示する映像表示制御部と、当該映像表示制御部の制御に対応して、前記バックライトユニットの発光素子の発光輝度を制御するバックライト制御部とを備えた液晶表示装置において、
前記映像表示制御部は、子画面映像表示領域外の液晶画素の開口率を所定値に制御し、
前記バックライト制御部は、前記映像表示制御部の制御に対応して、前記子画面映像表示領域外を照明する発光素子の輝度値を所定値に制御し、
前記映像表示制御部による前記子画面映像表示領域外の前記液晶画素の開口率と、前記バックライト制御部による前記子画面映像表示領域外を照明する前記発光素子の輝度値との相互関係により、前記子画面映像表示領域外の輝度を所定値に制御することを特徴とする液晶表示装置。 - 前記子画面映像表示領域外の輝度の制御は、前記映像表示制御部による前記子画面映像表示領域外の前記液晶画素の開口率の制御のみ、又は、前記バックライト制御部による前記子画面映像表示領域外を照明する前記発光素子の輝度値の制御のみによって行うことを特徴とする請求項1に記載の液晶表示装置。
- 前記映像表示制御部による前記子画面映像表示領域外の前記液晶画素の開口率の制御は、前記子画面映像表示領域外を照明する前記発光素子の輝度値、及び/又は、前記映像表示領域の表示映像を照明するための発光素子による発光の光漏れの輝度値に対応して制御することを特徴とする請求項1又は2に記載の液晶表示装置。
- 前記光漏れにより照明される領域に対応する部分の液晶画素の開口率の制御は、少なくとも一定区間の間、前記映像表示領域から遠ざかるにつれて漸次減少する前記光漏れの輝度値変化とは逆に、前記映像表示領域から遠ざかるにつれて漸次増加するように制御することを特徴とする請求項3に記載の液晶表示装置。
- 前記液晶パネルの前記子画面映像表示領域外の輝度が少なくとも一定区間の間、一定値、又は、当該輝度が前記映像表示領域から遠ざかるにつれて漸次減少するように、前記映像表示制御部による前記液晶画素の開口率の制御、及び/又は、前記バックライト制御部による前記発光素子の輝度値の制御を実行することを特徴とする請求項1又は2に記載の液晶表示装置。
- 前記液晶パネルの前記映像表示領域の周辺領域が縁取られるように、前記映像表示制御部による前記液晶画素の開口率の制御と、前記バックライト制御部による前記発光素子の輝度値の制御をすることを特徴とする請求項1又は2に記載の液晶表示装置。
- 前記バックライト制御部は、前記映像表示領域の表示映像を照明するために、当該映像表示領域に対応する発光素子を発光、又は、当該映像表示領域に対応する発光素子及び当該映像表示領域の外側近傍領域に対応する発光素子を発光することを特徴とする請求項1又は2に記載の液晶表示装置。
- 前記バックライト制御部は、前記映像表示領域の表示映像を照明するために、当該映像表示領域の内側領域に対応する発光素子を発光することを特徴とする請求項1又は2に記載の液晶表示装置。
- 前記子画面映像表示領域外に表示する背景画像データを記憶する記憶部を備え、前記映像表示制御部は、前記子画面映像表示領域外に前記記憶部の背景画像データを表示することを特徴とする請求項1又は2に記載の液晶表示装置。
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- 2010-08-19 US US13/391,532 patent/US8797254B2/en not_active Expired - Fee Related
- 2010-08-19 WO PCT/JP2010/064000 patent/WO2011021663A1/ja active Application Filing
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JP2013205763A (ja) * | 2012-03-29 | 2013-10-07 | Canon Inc | 表示装置及びその制御方法 |
JP2014059546A (ja) * | 2012-08-23 | 2014-04-03 | Canon Inc | 表示装置及びその制御方法 |
JP2017199009A (ja) * | 2017-06-12 | 2017-11-02 | シャープ株式会社 | 表示装置、表示方法及びプログラム |
WO2019176788A1 (ja) * | 2018-03-13 | 2019-09-19 | 日本精機株式会社 | 表示装置 |
JPWO2019176788A1 (ja) * | 2018-03-13 | 2021-03-25 | 日本精機株式会社 | 表示装置 |
US11170722B2 (en) | 2018-03-13 | 2021-11-09 | Nippon Seiki Co., Ltd. | Display device with a backlight |
JP7265716B2 (ja) | 2018-03-13 | 2023-04-27 | 日本精機株式会社 | 表示装置 |
EP4098470A1 (en) * | 2021-06-02 | 2022-12-07 | InnoLux Corporation | Operating method of optical system in vehicle |
US11970116B2 (en) | 2021-06-02 | 2024-04-30 | Innolux Corporation | Operating method of optical system in vehicle |
Also Published As
Publication number | Publication date |
---|---|
JPWO2011021663A1 (ja) | 2013-01-24 |
JP5092053B2 (ja) | 2012-12-05 |
CN102483902A (zh) | 2012-05-30 |
US8797254B2 (en) | 2014-08-05 |
MX2012002096A (es) | 2012-04-10 |
CN102483902B (zh) | 2014-07-16 |
US20120200485A1 (en) | 2012-08-09 |
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