Stacked display panel construction and method of aligning pixel elements thereof

• US 5,299,039 A
• Filed: 03/08/1991
• Issued: 03/29/1994
• Est. Priority Date: 07/21/1988
• Status: Expired due to Fees

• Current Assignee: Proxima Corporation (Ask ASA)
• Original Assignee: Proxima Corporation (Ask ASA)
• Inventors: Bohannon, William K.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US07/667,039
• Time in Patent Office: 1,117 Days
• Field of Search: 359/48, 359/53, 359/54, 359/55, 359/87, 340/784, 353/122
• US Class Current: 349/6
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133533 Colour selective polarisers G02F1/1347 takes precedence
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
• CPC Class Codes: G02F 1/13473 for wavelength filtering or for colour display without the use of colour mosaic filters
• CPC Class Codes: G02F 1/1397 the twist being substantially higher than 90°, e.g. STN-, SBE-, OMI-LC cells
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• 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 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 5/028 Circuits for converting colour display signals into monochrome display signals
• CPC Class Codes: H04N 2005/745 Control circuits therefor
• CPC Class Codes: H04N 5/57 Control of contrast or brightness
• CPC Class Codes: H04N 9/12 Picture reproducers H04N9/11 takes precedence
• CPC Class Codes: H04N 9/3126 for spatial light modulators in series
• CPC Class Codes: H04N 9/64 Circuits for processing colour signals H04N9/77 takes precedence; camera processing pipelines for processing colour signals H04N23/84

Abstract

A stacked liquid crystal display panel construction and method of aligning its pixel elements includes a liquid crystal panel assembly having a plurality of programmable controlled pixel elements for adjusting the relative position of a light image transmitted by the assembly. The pixel elements are controlled programmably by a image control unit that enables the addressing of the pixel elements to be selectively shifted for aligning optically pixels and for causing the display image transmitted by the panel assembly to be scrolled.

Claims

1. A display apparatus comprising:

stacked liquid crystal display units, said stacked liquid crystal display units including top, intermediate and base liquid crystal display units, said base liquid crystal display unit having a base group of liquid crystal pixel elements arranged in rows and columns defining a base pixel element array;

said intermediate liquid crystal display unit having an intermediate group of liquid crystal pixel elements arranged in rows and columns defining an intermediate pixel element array;

said intermediate pixel element array including an intermediate central pixel array having a same number of rows and columns as said base group but occupying a substantially smaller area than either said base group or said intermediate group;

said top liquid crystal display unit having a top group of liquid crystal pixel elements arranged in rows and columns defining a top pixel element array;

said top pixel element array including a top central pixel array having a same number of rows and columns as said base group but occupying a substantially smaller area than said either base group or said intermediate group or said top group;

said base liquid crystal unit, said intermediate liquid crystal unit, and said top liquid crystal unit each having different pixel element sizes;

intermediate means for aligning optically a base group of pixel images produced by said base group of pixel elements with an intermediate group of pixel images produced by a selected group of the pixel elements in said intermediate pixel array to merge the base group of pixel images and said intermediate group of pixel images; and

top means for aligning optically said intermediate group of pixel images with a top group of pixel images produced by a selected group of the pixel elements in said top pixel array to merge the intermediate group of pixel images and said top group of pixel images.

2. A apparatus according to claim 1, further comprising:

means for generating signals indicative of adjusted image positions of the intermediate and top units; and

means for supplying said signals to said intermediate and top means to cause them to move adjustably the overall images of the intermediate and top images adjustably for optical alignment purposes.

3. A display apparatus according to claim 1, wherein said base pixel array produces a base image A, where A defines the area of said base image.

4. A display apparatus according to claim 3, wherein said intermediate pixel array produces an intermediate image having an area of about 0.9945A.

5. A display apparatus according to claim 3, wherein said top pixel array produces a top image having an area of about 0.9916A.

6. A display apparatus according to claim 1, wherein said base pixel array is a 720×

480 pixel array.

7. A display apparatus according to claim 6 wherein said intermediate pixel array is a 724 by 482 pixel array.

8. A display apparatus according to claim 7 wherein said top pixel array is a 726 by 484 pixel array.

9. A display apparatus according to claim 1 wherein the number of pixel elements in a horizontal row of said intermediate pixel array is greater than the number of horizontal pixel elements in said base pixel array.

10. A display apparatus according to claim 9 wherein said greater number of pixel elements is 2.

11. A display apparatus according to claim 9 wherein the number of pixel elements in a horizontal row of said top pixel array is greater than the number of horizontal pixel elements in said intermediate pixel array.

12. A display apparatus according to claim 11 wherein the greater number of pixel elements is 2.

13. A display apparatus according to claim 1 wherein the number of pixel elements in a vertical row of said intermediate pixel array is greater than the number of vertical pixel elements in said base pixel array.

14. A display apparatus according to claim 9 wherein said greater number of pixel elements is 2.

15. A display apparatus according to claim 9, wherein said number of pixel elements in a vertical row of said top pixel array is greater than the number of vertical pixel elements in said intermediate pixel array.

16. A display apparatus according to claim 11 wherein the greater number of pixel elements is 2.

17. A method for aligning pixel elements disposed in a group of stacked liquid crystal panels, comprising:

applying electrical power to the group of panels, said group having a base pixel array arranged in rows and columns in a bottom panel forming part of the group, an intermediate pixel array arranged in rows and columns in an intermediate panel forming part of the group, said intermediate array having a border array of pixel elements and a central array of pixel elements, a top pixel array arranged in rows and columns in a top panel forming part of the group, said top array having a border array of pixel elements and a central array of pixel elements;

energizing the base pixel array to form a base image;

energizing selected ones of the individual pixel elements in said intermediate pixel array to form an intermediate image;

adjusting electrically the position of said intermediate image until it aligns optically with said base image along electronically controlled optical paths;

energizing selected ones of the individual pixel elements in said top pixel array to form a top image; and

adjusting electrically the position of said top image until it aligns optically with said intermediate image and said base image along the electronically controlled optical paths.