IMAGE DISPLAY DEVICE

• US 20100265281A1
• Filed: 04/08/2010
• Published: 10/21/2010
• Est. Priority Date: 04/15/2009
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Asano, Mitsuyasu, FURUKAWA, Norimasa
• Application Number:
  US12/756,831
• Publication Number:
  US 20100265281A1
• Time in Patent Office: Days
• US Class Current: 345/691
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

The image display device includes a light source section having light emitting subsections; a display panel; and a display control section performing a control. An input frame image is decomposed into a plurality of field images and the field images are displayed in a field sequential manner. A differential image for each of the three primary-color components is obtained by subtracting a common luminance portion from the subsection-drive frame image. The differential image and a common image configured of the common luminance portion are sequentially outputted to the display panel in a time-divisional manner. In the first field period for outputting the differential image of a primary color component, corresponding primary color light is emitted, and in a second field period for outputting the common image, multiple kinds of primary color light, corresponding to the primary-color components configuring the common luminance portion, are emitted together.

Claims

1. An image display device comprising:

a light source section having a plurality of light emitting subsections configured to be controlled independently of each other, each of the light emitting subsections emitting multiple kinds of color light;

a display panel modulating color light emitted from the light source section based on an input picture signal; and

a display control section controlling the light emitting subsections of the light source section and the display panel, so that an input frame image configured of the input picture signal is decomposed into a plurality of field images, and so that the plurality of field images are time-divisionally displayed in a field sequential manner,

wherein the display control section includes

a subsection-drive processing section applying a predetermined resolution-lowering process on the input picture signal, thereby generating a light emission pattern based on a result of the resolution-lowering process, the light emission pattern being to be formed through selective light emitting operations of the plurality of light emitting subsections of the light source section, and then the subsection-drive processing section performing a dividing operation in which a signal level of each pixel signal in the input picture signal is divided by an emission-level of corresponding light emitting subsection in the light emission pattern, thereby generating a subsection-drive picture signal as a result of the dividing operation,

a signal analysis section analyzing color components of a subsection-drive frame image configured of the subsection-drive picture signal, to extract a first common luminance portion from the subsection-drive frame image, the first common luminance portion having a luminance magnitude common to two or more of three primary-color components configured of red, green, and blue components,

a signal output section obtaining a first differential image for each of the three primary-color components by subtracting the first common luminance portion from the subsection-drive frame image, and sequentially outputting, as the plurality of field images, the first differential images for the primary-color components and a first common image which is configured of the first common luminance portion to the display panel in a time-divisional manner, and

a color light selection section selecting color light to be emitted from the light source section based on the light emission pattern and the first common image, so that, in each of first field periods where the first differential images for the primary color components are outputted respectively, only corresponding primary color light is emitted, and in a second field period where the first common image is outputted, multiple kinds of primary color light, corresponding to the two or more primary-color components which configure the first common luminance portion, are emitted together.

2. The image display device according to claim 1, wherein

the first common luminance portion is a portion having a luminance magnitude common to any two of the three primary-color components, and

the color light selection section selecting the color light emitted from the light source section, so that two kinds of primary color light, which corresponds to the two of the three primary-color components respectively, are emitted together in the second field period.

3. The image display device according to claim 2, wherein

the first common luminance portion is a portion having a luminance magnitude common to red and green components, which corresponds to a yellow component, and

the color light selection section selecting the color light emitted from the light source section, so that red light and green light are emitted together in the second field period.

4. The image display device according to claim 2, wherein

the signal output section outputs, in another field period, a field image which corresponds to a primary color component other than the two of the three primary-color components, and

the color light selection section selects and controls all the light emitting subsections in the light source section to emit light in the another field period.

5. The image display device according to claim 1,

wherein the first common luminance portion is a portion having a luminance magnitude common to all the three primary-color components, which corresponds to a white component, and

the color light selection section selecting the color light emitted from the light source section, so that the three kinds of primary color light configured of red, green and blue light are emitted together in the second field period.

6. The image display device according to claim 1, wherein

the signal analysis section analyzes color components of the input frame image, thereby obtains a signal level of each of a plurality of color component images which are obtained through decomposing the input frame image into a plurality of color components,

the display control section further includes a fundamental-image determination section calculating a luminance level with consideration of a visibility characteristic for each of the color component images based on a signal level of each of the color component images obtained by the signal analysis section, and then determining a color component image, having the highest luminance level or the second highest luminance level, as a fundamental image,

the signal output section further performs processes of obtaining a second differential image for each of the plurality of color components by subtracting the fundamental image from the subsection-drive frame image, halving the second differential image obtained for each of the color components, and then sequentially outputting halved images for each of the color components as well as the fundamental image, as the plurality of field images, to the display panel in a time-divisional manner, and

the display control section further includes an output sequence determination section controlling output sequence in a frame of the plurality of field images outputted from the signal output section so that the fundamental image is displayed in a temporally central position within a frame period, and so that the halved images are displayed before and after the fundamental image in such a manner that a halved image having a higher luminance level with consideration of the visibility characteristic is located closer to the fundamental image.

7. The image display device according to claim 6, wherein

the fundamental image determination section determines a color component image as the fundamental image, which satisfies such a condition that, when the plurality of color component images corresponding to one frame are displayed on the display panel, composite luminance distribution on a retina of an observer has high luminance at center and low luminance in periphery, and a spreading range of the composite luminance distribution is minimized.

8. The image display device according to claim 6, wherein

the signal analysis section obtains a signal level of each of three primary-color components images which are obtained through decomposing the input frame image into only the three primary-color component, and signal levels of another color component images which are obtained through extracting another optional color components from the input frame image.

9. The image display device according to claim 8, wherein

the signal analysis section obtains at least signal levels of a white component image and a complementary color component image as the signal levels of another color component images, the white component image and the complementary color component being obtained through extracting a white component and a complementary color component from the input frame image, respectively.

10. The image display device according to claim 6, wherein

the fundamental-image determination section calculates the luminance level with use of luminance transformation expressions selected from a plurality of luminance transformation expressions.

11. The image display device according to claim 10, wherein

the fundamental-image determination section selectively uses at least two kinds of luminance transformation expressions applicable to photopic vision and scotopic vision, respectively, as the luminance transformation.

12. The image display device according to claim 10, wherein

the fundamental-image determination section selectively uses at least two kinds of luminance transformations expressions applicable to a person with normal color vision and a color deviant, respectively, as the luminance transformation.

13. The image display device according to claim 6, wherein

the display control section forms a composite field image from adjacent two field images, and displays the composite field image within a field period, one of the two field images belonging to a first frame and another belonging to second frame which is adjacent to first frame.

14. The image display device according to claim 6, wherein

the signal analysis section further extracts a second common luminance portion from the input frame image, the second common luminance portion having a luminance magnitude common to two or more of the three primary-color components, and

the fundamental-image determination section determines, as the fundamental image, a second common image configured of the second common luminance portion.