Display device and video viewing system
View Patent ↗A display device includes: a liquid crystal panel including a display surface on which frame images are displayed; a conversion portion for converting a frame image signal into a first image signal representing an image having a lower resolution and a second image signal representing an image having a higher resolution; and a liquid crystal driver for driving the liquid crystal panel with performing first and second scanning operations of the first and second image signals over pixels of the entire display surface. The liquid crystal driver performs the second scanning operation with targeting a drive luminance value which is set in response to an expected value of an achieved luminance value during the first scanning operation for the pixel of the display surface before the second scanning operation commences, and target luminance value for the pixels defined by the frame image signal.
1. A display device comprising:
a liquid crystal panel including a display surface on which frame images are displayed;
a conversion portion configured to convert a frame image signal to display the frame image into a first image signal representing an image having a resolution lower than what the frame image signal represents and a second image signal representing an image having a resolution higher than what the first image signal represents; and
a liquid crystal driver configured to drive the liquid crystal panel with performing a first scanning operation of the first image signal and a second scanning operation of the second image signal over pixels of the entire display surface, wherein
the liquid crystal driver performs the second scanning operation with targeting a drive luminance value, which is determined in response to an expected value of an achieved luminance value during the first scanning operation for the pixel before the second scanning operation commences and a target luminance value defined for the pixel by the frame image signal.
2. The display device according to claim 1 , wherein
the frame images include a left frame image, which is viewed by a left eye, and a right frame image, which is viewed by a right eye, and
the liquid crystal panel alternately switches between the left and right frame images with time so as to make displayed images stereoscopically perceived on the display surface.
3. The display device according to claim 1 , wherein
the display surface has a pixel group including pixels aligned in a sub-scan direction,
the conversion portion generates an equalizing signal, which defines a common equalized luminance value to the pixel group, in response to the frame image signal, and
the liquid crystal driver simultaneously performs the first scanning operation for the pixels in the pixel group in response to the equalized luminance value.
4. The display device according to claim 3 , wherein
the equalizing signal defines an averaged luminance value over luminance values which the frame image signal defines for the pixels in the pixel group, respectively, to allocate the averaged luminance value to the pixels in the pixel group, respectively.
5. The display device according to claim 3 , wherein
the equalizing signal allocates a luminance value to the pixels in the pixel group so that the allocated luminance value is equivalent to a luminance value which the frame image signal defines for a pixel selected from the pixels in the pixel group.
6. The display device according to claim 1 , wherein
a first scanning period during which the first scanning operation is performed by means of the first image signal over the pixels of the entire display surface is shorter than a second scanning period during which the second scanning operation is performed by means of the second image signal over the pixels of the entire display surface.
7. The display device according to claim 3 , wherein
the conversion portion sets the expected value of the achieved luminance value in response to a current luminance value of the pixel defined by the equalizing signal corresponding to a frame image of ongoing display, and a preceding luminance value of the pixel defined by the equalizing signal corresponding to a preceding frame image which was displayed immediately before the frame image of the ongoing display.
8. The display device according to claim 7 , wherein
the conversion portion sets the expected values of the achieved luminance value in response to a sub-scan directional position of the pixel.
9. The display device according to claim 7 , wherein
the conversion portion sets the drive luminance value by means of a first table including first data to determine the drive luminance value in response to the current luminance value and the preceding luminance value.
10. The display device according to claim 1 , wherein
the conversion portion sets the drive luminance value so that a difference between the drive luminance value and the target luminance value increases as a difference between the expected value of the achieved luminance value and the target luminance value increases.
11. The display device according to claim 1 , wherein
the conversion portion sets the drive luminance value in response to a sub-scan directional position of the pixel.
12. The display device according to claim 1 , wherein
the conversion portion sets the drive luminance value in response to the target luminance value for the pixel defined by the frame image signal corresponding to a preceding frame image which was displayed immediately before a frame image of ongoing display.
13. The display device according to claim 12 , wherein
the second table includes an expected value table which stores expected value data about the expected value of the achieved luminance value, and a determination table to determine the drive luminance value in response to the expected value data and the target luminance value.
14. The display device according to claim 1 , wherein
the conversion portion sets the drive luminance value by means of a second table including second data to determine the drive luminance value in response to the expected value of the achieved luminance value and the target luminance value.
15. A video viewing system comprising:
a display device configured to display a left frame image, which is viewed by a left eye, and a right frame image, which is viewed by a right eye, so as to provide images which are stereoscopically perceived; and
an eyeglass device including a left filter, which adjusts a light amount that reaches the left eye so that the left frame image is viewed, and a right filter, which adjusts a light amount that reaches the right eye so that the right frame image is viewed, wherein
the display device includes
a liquid crystal panel which alternately displays the left and right frame images on a display surface with time,
a conversion portion configured to convert a frame image signal to display the left or right frame image into a first image signal representing an image having a resolution lower than what the frame image signal represents and a second image signal representing an image having a resolution higher than what the first image signal represents, and
a liquid crystal driver configured to drive the liquid crystal drive panel with performing a first scanning operation of the first image signal and a second scanning operation of the second image signal over pixels of the entire display surface, and
the liquid crystal driver performs the second scanning operation with targeting a drive luminance value, which is determined in response to an expected value of an achieved luminance value during the first scanning operation for the pixel before the second scanning operation commences and a target luminance value defined for the pixel by the frame image signal.