Display apparatus
First Claim
Patent Images
1. A display apparatus comprising:
- an image display panel that displays an image thereon;
a planar light source that is disposed on a back side of the image display panel and that includes a light guide plate having an incident surface and a plurality of light sources of sidelight type lights along a side of the light guide plate, the light sources irradiating a plurality of divided areas of the image display panel through the incident surface of the light guide plate; and
a signal processor that drives the light sources individually based on input signals of the image, the input signals being calculated using predetermined lookup tables each indicating a light intensity distribution of the divided areas when respective ones of the light sources irradiate the light guide plate and light travels therethrough, thereby to control brightness of the individual divided areas,wherein the signal processor performs image display on the image display panel using output signals obtained by lowering brightness of a dark region in the image represented by the input signals,wherein the signal processor performs a histogram analysis on the input signals and lowers the brightness of the dark region in accordance with characteristics corresponding to a result of the histogram analysis to obtain the output signals, andwherein, in accordance with the result of the histogram analysis, the signal processor performs image processing such that;
for a region in which brightness of an original image is equal to or higher than a certain brightness threshold, brightness of the original image is maintained; and
for a region in which brightness of the original image is lower than the certain brightness threshold, decrease in brightness after the image processing relative to decrease in brightness of the original image becomes gradually larger as the brightness of the original image decreases.
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Abstract
According to an aspect, a display apparatus includes: an image display panel that displays an image thereon; a planar light source that includes a plurality of light sources and irradiates a plurality of divided areas of the image display panel with light from the back side of the image display panel; and a signal processor that drives the light sources individually based on input signals of the image to control brightness of the individual divided areas. The signal processor performs image display on the image display panel using output signals obtained by lowering brightness of a dark region in the image represented by the input signals.
13 Citations
16 Claims
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1. A display apparatus comprising:
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an image display panel that displays an image thereon; a planar light source that is disposed on a back side of the image display panel and that includes a light guide plate having an incident surface and a plurality of light sources of sidelight type lights along a side of the light guide plate, the light sources irradiating a plurality of divided areas of the image display panel through the incident surface of the light guide plate; and a signal processor that drives the light sources individually based on input signals of the image, the input signals being calculated using predetermined lookup tables each indicating a light intensity distribution of the divided areas when respective ones of the light sources irradiate the light guide plate and light travels therethrough, thereby to control brightness of the individual divided areas, wherein the signal processor performs image display on the image display panel using output signals obtained by lowering brightness of a dark region in the image represented by the input signals, wherein the signal processor performs a histogram analysis on the input signals and lowers the brightness of the dark region in accordance with characteristics corresponding to a result of the histogram analysis to obtain the output signals, and wherein, in accordance with the result of the histogram analysis, the signal processor performs image processing such that; for a region in which brightness of an original image is equal to or higher than a certain brightness threshold, brightness of the original image is maintained; and for a region in which brightness of the original image is lower than the certain brightness threshold, decrease in brightness after the image processing relative to decrease in brightness of the original image becomes gradually larger as the brightness of the original image decreases. - View Dependent Claims (2, 3, 4, 5)
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6. A display apparatus comprising:
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an image display panel that displays an image thereon; a planar light source that is disposed on a back side of the image display panel and that includes a light guide plate having an incident surface and a plurality of light sources of sidelight type lights along a side of the light guide plate, the light sources irradiating a plurality of divided areas of the image display panel through the incident surface of the light guide plate; and a signal processor that controls brightness of the divided areas based on input signals of the image, the input signals being calculated using predetermined lookup tables each indicating a light intensity distribution of the divided areas when respective ones of the light sources irradiate the light guide plate and light travels therethrough, wherein the signal processor performs image display on the image display panel using output signals obtained by lowering brightness of a dark region in the image represented by the input signals, wherein the signal processor performs a histogram analysis on the input signals and lowers the brightness of the dark region in accordance with characteristics corresponding to a result of the histogram analysis to obtain the output signals, and wherein the signal processor lowers brightness of the dark region by; performing bit-length extension processing on the input signals, and performing image processing on the input signals subjected to the bit-length extension processing, using corrected expansion coefficients of respective pixels arranged in the image display panel, the corrected expansion coefficients being obtained by correcting expansion coefficients of the respective pixels using correction coefficients corresponding to the expansion coefficients. - View Dependent Claims (7, 8, 9, 10)
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11. A display apparatus comprising:
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an image display panel that displays an image thereon; a planar light source that is disposed on a back side of the image display panel and that includes a light guide plate having an incident surface and a plurality of light sources of sidelight type lights along a side of the light guide plate, the light sources irradiating a plurality of divided areas of the image display panel through the incident surface of the light guide plate; and a signal processor that controls brightness of the divided areas based on input signals of the image, the input signals being calculated using predetermined lookup tables each indicating a light intensity distribution of the divided areas when respective ones of the light sources irradiate the light guide plate and light travels therethrough, wherein the signal processor performs image display on the image display panel using output signals obtained by lowering brightness of a dark region in the image represented by the input signals, wherein the signal processor performs a histogram analysis on the input signals and lowers the brightness of the dark region in accordance with characteristics corresponding to a result of the histogram analysis to obtain the output signals, and wherein, in accordance with the result of the histogram analysis, the signal processor performs image processing such that; for a region in which brightness of an original image is equal to or higher than a certain brightness threshold, brightness of the original image is maintained; and for a region in which brightness of the original image is lower than the certain brightness threshold, decrease in brightness after the image processing relative to decrease in brightness of the original image becomes gradually larger as the brightness of the original image decreases. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification