Time sequential lookup table method for a display

• US 6,744,443 B2
• Filed: 11/19/2001
• Issued: 06/01/2004
• Est. Priority Date: 12/19/1996
• Status: Expired due to Term

• Current Assignee: Emerson Radio Corporation (Nimble Holdings Co. Ltd.)
• Original Assignee: Brillian Corporation (Syntax-Brillian Corporation)
• Inventors: McKnight, Douglas J., Gorny, Douglas J., Bohn, Jr., Lowell F.
• Primary Examiner(s): Chauhan, Ulka J.
• Application Number:
  US09/989,764
• Publication Number:
  US 20020030691A1
• Time in Patent Office: 925 Days
• Field of Search: 345/519, 345/206, 345/204, 345/205, 345/88, 345/600-602, 345/605, 345/536
• US Class Current: 345/602
• CPC Class Codes: G06F 3/147 using display panels
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2330/04 Display protection
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables

Abstract

A method and apparatus employing lookup tables in a time sequential manner. A substrate has a display, a digital to analog converter, and a lookup table (LUT) formed thereon. The LUT is loaded with a LUT data set corresponding to an image subframe to be driven to the display. Successive LUT data sets corresponding to the next subframe are loaded after each subframe is driven to the display.

Claims

1. A method of forming a display having a lookup table (LUT), said method comprising:

forming a display on a first substrate;

forming a digital to analog converter (DAC) on the first substrate with the display, wherein the DAC is coupled to the display; and

forming a lookup table (LUT) on the first substrate, wherein the LUT is coupled to the DAC.

2. The method of claim 1, further comprising:

storing a plurality of LUT data sets in a storage device on a second substrate; and

selecting with a state machine which LUT data set of the plurality of LUT data sets are to be loaded into the LUT.

3. The method of claim 2, wherein the state machine cycles through a sequence of LUT data sets selected from the group consisting of R, G, B, {overscore (R)}, {overscore (G)} and {overscore (B)}.

4. The apparatus of claim 3 wherein the sequence includes the pattern R, {overscore (G)}, B, {overscore (R)}, G, {overscore (B)}.

5. The method of claim 3, where the sequence alternates between a data set for a color and a data set for an inverted color.

6. The method of claim 2 further comprising:

segregating incoming image data into monochrome subframes with a parser; and

storing the subframes in the storage device with a memory controller.

7. The method of claim 2, wherein the LUT data sets map an m-bit value into an n-bit value where n>

m.

8. The method of claim 2, wherein the LUT data sets adjust for non-linearity in the DAC and the display.

9. The method of claim 2, wherein the plurality of LUT data sets includes a data set corresponding to at least one of a temperature range, and a contrast control.

10. The method of claim 2, wherein the state machine cycles through R, G, B, LUT data sets and performs digital inversion of every second data set.

11. The method of claim 1, wherein the display has a data path, the data path having a width of r pixels wherein one LUT and one DAC are formed on the substrate for each of the r pixels of the data path, wherein r is a positive integer.

12. A method for a display system, said method comprising:

forming a display on a first substrate;

forming a lookup table (LUT) on the first substrate, wherein the LUT is coupled to the display;

generating image frames from an image source;

storing a plurality of subframes of the image frames;

generating a plurality of LUT data sets corresponding to the stored plurality of subframes;

storing the LUT data sets external to the first substrate; and

sequentially loading the LUT data sets into the lookup table on the first substrate with a state machine.

13. The method of claim 12, wherein the storage unit and the state machine are formed on a second substrate.

14. The method of claim 13, wherein the LUT data sets are stored on the second substrate prior to loading into the LUT.

15. The method of claim 12, wherein the subframes include a red (R) subframe, a green (G) subframe, and a blue (B) subframe.

16. The method of claim 12, wherein a sequence in which the LUT is loaded alternates between a subframe data set and an inverted subframe data set.

17. The method of claim 12, wherein the plurality of LUT data sets comprise sets corresponding to inverted subframes.