Method and apparatus for adjusting subpixel intensity values based upon luminance characteristics of the subpixels for improved viewing angle characteristics of liquid crystal displays
First Claim
1. A method for generating an image for display on a display device having a plurality of subpixels, the method comprising the steps of:
- Providing, in digital form, luminance data which associates intensity values with corresponding luminance values characterizing luminance of said subpixels in at least one viewing angle direction for a range of said intensity values;
providing a group of subpixel data elements representing color of a portion of said image, wherein each of said subpixel data elements comprises an intensity value;
modifying said intensity values for said subpixel data elements in said group based upon said luminance data to reduce the number of said subpixels that have a luminance value in a range of mid-tone luminance values between a bright luminance value and a dark luminance value; and
outputting said modified intensity values for said subpixel data elements of said group for display on said display device.
3 Assignments
0 Petitions
Accused Products
Abstract
Viewing angle characteristics of a liquid crystal display (LCD) are improved by reducing the number of subpixels in an image with mid-tone luminance values. In a preferred embodiment, a first table of entries associating subpixel intensity values and subpixel luminance values for a LCD in at least one viewing angle direction is provided. A target intensity value is determined from the first table, corresponding to the average subpixel luminance over a small number of adjacent subpixels. A second table of entries associates the target intensity values with intensity values above and below the target. The adjacent subpixel intensity values are modified according to the second table, thereby reducing the number of subpixels with mid-tone luminance values. The subpixel data is preferably processed within a portion of an application-specific integrated circuit (ASIC), contained within the display module.
-
Citations
36 Claims
-
1. A method for generating an image for display on a display device having a plurality of subpixels, the method comprising the steps of:
-
Providing, in digital form, luminance data which associates intensity values with corresponding luminance values characterizing luminance of said subpixels in at least one viewing angle direction for a range of said intensity values;
providing a group of subpixel data elements representing color of a portion of said image, wherein each of said subpixel data elements comprises an intensity value;
modifying said intensity values for said subpixel data elements in said group based upon said luminance data to reduce the number of said subpixels that have a luminance value in a range of mid-tone luminance values between a bright luminance value and a dark luminance value; and
outputting said modified intensity values for said subpixel data elements of said group for display on said display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20)
-
-
17. A programmable storage device readable by a digital processing apparatus and tangibly embodying a program of instructions executable by the digital processing apparatus to perform method steps for generating an image for display on a display device having a plurality of subpixels, the method steps comprising:
-
providing luminance data, in digital form, which associates intensity values with corresponding luminance values characterizing luminance of said subpixels in at least one viewing angle direction for a range of said intensity values;
providing a group of subpixel data elements representing color of a portion of said image, wherein each of said subpixel data elements comprises an intensity value;
modifying said intensity values for said subpixel data elements in said group based upon said luminance data to reduce the number of said subpixels that have a luminance value in a range of mid-tone luminance values between a bright luminance value and a dark luminance value; and
outputting said modified intensity values for said subpixel data elements of said group for display on said display device.
-
-
21. An apparatus for generating an image for display on a display device having a plurality of subpixels comprising:
-
a first memory wherein luminance data, in digital form, which associates intensity values with corresponding luminance values characterizing luminance of said subpixels in at least one viewing angle direction for a range of intensity values are stored;
a second memory wherein a group of subpixel data elements representing color of a portion of said image, wherein each of said subpixel data elements comprises an intensity value are stored; and
an intensity controller which modifies said intensity values for said subpixel data elements in said group based upon said luminance data to reduce the number of said subpixels that have a luminance value in a range of mid-tone luminance values between a bright luminance value and a dark luminance value.
-
-
22. A computer, comprising:
-
a display device which displays an image; and
a processor which provides data to said display device, wherein said data is configured to control said display device in order to display said image, and wherein said data is configured so that said image is displayed as;
a plurality of subpixels logically partitioned into a first category and a second category, wherein;
the first category of subpixels are supplied with a data signal of a first polarity, the second category of subpixels are supplied with a data signal of a second polarity opposite said first polarity, and the subpixels are partitioned to reduce perceived flicker in the displayed image;
and wherein;
the subpixels correspond to data elements representing color of at least a portion of said image, wherein each of said data elements comprises an intensity value, and wherein said intensity values have been modified to reduce the number of said data elements having a luminance value corresponding to said intensity value in a range of mid-tone luminance values between a bright luminance value and a dark luminance value. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
Specification