Modular flat-screen television displays and modules and circuit drives therefor

• US 5,079,636 A
• Filed: 02/23/1990
• Issued: 01/07/1992
• Est. Priority Date: 07/21/1988
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Magnascreen Corporation
• Inventors: Brody, Thomas P.
• Primary Examiner(s): Chin, Tommy P.
• Application Number:
  US07/484,578
• Time in Patent Office: 683 Days
• Field of Search: 358/241, 358/230, 358/56, 358/59, 340/718, 340/719, 340/754, 340/758, 340/760, 340/781, 340/783, 340/784
• US Class Current: 348/383
• CPC Class Codes: G02F 1/13336 Combining plural substrates to produce large-area displays, e.g. tiled displays
• CPC Class Codes: G06F 3/147 using display panels
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: G09G 2300/026 Video wall, i.e. juxtaposition of a plurality of screens to create a display screen of bigger dimensions
• CPC Class Codes: G09G 2360/04 Display device controller operating with a plurality of display units
• CPC Class Codes: H04N 9/12 Picture reproducers H04N9/11 takes precedence
• CPC Class Codes: Y10S 345/903 Modular display

Abstract

A modular flat-screen television display having a large area image can be made using an array of modules of easily manufacturable size and preferably removable. The image on each module extends to the edge of the module so that when placed in the array there is no substantial interruption in the television image since the distance between modules is the same as the distance between picture elements within the modules. Control and drive circuitry enable each module to be driven at the same time, thereby decreasing the time it takes to refresh the entire display. The modules contain picture elements which may be emissive, reflective or transmissive.

Claims

1. A module for a flat-screen television display comprising:

A. a substrate with first and second major surfaces and edge surfaces;

B. a matrix of transparent conducive pads capable of defining picture elements and extending over the first major surface of the substrate in a regular pattern with boundary conductive pads adjacent the edge surfaces of the substrate to distances such that the regular pattern is capable of continuing substantially uninterrupted when a similar module is positioned adjacent said module;

C. a matrix of electrical switching elements extending over the first major surface of the substrate with each said switching element capable of activating one of said conductive pads upon receiving electrical signals through both row and column conductive strips;

D. said row and column conductive strips each extending over the first major surface from adjacent an edge surface to adjacent an opposite edge surface of the substrate such that each said switching element can be electrically activated by a row conductive strip and a column conductive strip;

E. an electrical drive circuit positioned adjacent the second major surface of the substrate an capable of electrically activating the switching elements in correspondence to desired visual images to be formed by the picture elements over the first major surface of said substrate; and

F. interconnecting conductors electrically connecting the drive circuit adjacent the second major surface of the substrate with the row and column conductive strips on the first major surface of said substrate and electrically insulated from similar interconnecting conductors of an adjacent module.

2. A module for a flat-screen television display as described in claim 1 wherein the conductive pads are transparent, and said module has a light modulating film positioned in contact with the matrix of conductive pads to form said picture elements.

3. A module for a flat-screen television display as described in claim 1 wherein at least one set of said row and one set of said column conductive strips are provided side-by-side while retaining the corresponding distance between said conductive pads of the regular pattern.

4. A module for a flat-screen television display as described in claim 1 wherein the first major surface of the substrate is a mirror surface adjacent which the conductive pads, switching elements and conductive strips are positioned.

5. A module for a flat-screen television as described in claim 1 wherein a color filter is positioned adjacent the first major surface of said substrate such that color television images can be displayed.

6. A module for a flat-screen television display as described in claim 1 wherein the interconnecting conductors connecting the drive circuit to the row and column conductive strips is positioned adjacent the edge surfaces of the substrate.

7. A module for a flat-screen television display as described in claim 1 wherein the desired visual image is simultaneously and sequentially presented by said electrical control circuit to the electrical drive circuit of said module and to the electrical drive circuit of each of the other adjacent modules.

8. A module for a flat-screen television display as described in claim 1 wherein that portion of the desired visual image corresponding to said module is fed sequentially to the electrical drive circuit of said module from said electrical control circuit while at the same time said module and the other adjacent modules are being driven in parallel.

9. A module for a flat-screen television display as described in claim 1 wherein said electrical control circuit comprises a decoder circuit and an image processor and wherein said electrical drive circuit comprises a plurality of analog and digital switches for activating the switching elements in response to sequential signals from the image processor simultaneously fed to said electrical drive circuit and to the electrical drive circuit of each of the other adjacent modules.

10. A module for a flat-screen television display as described in claim 1 wherein the image processor further comprises:

an analog-to-digital converter, for transferring an analog video signal to a digital signal which can be easily stored;

a memory for storing one frame of the video signal in digital form;

a digital-to-analog converter for generating an analog video signal for said module and for each of the other adjacent modules; and

a timing and control circuit for simultaneously directing different portions of the analog video signal to said module and each of the other adjacent modules.

11. A module for a flat-screen television display as described in claim 10 wherein the number of said analog-to-digital converters corresponds to the number of colors in the display and there are two memories for each color.

12. A module for a flat-screen television display as described in claim 10 wherein there is one said digital-to-analog converter for said module.

13. A module for a flat-screen television display as described in claim 10 wherein analog switches activate the column conductors and digital switches activate the row conductors of the switching elements.

14. A module for a flat-screen television display as described in claim 13 wherein there are three times as many digital switches as analog switches.

15. A module for a flat-screen television display as described in claim 13 wherein there are three times as many analog switches as digital switches.

16. A module for a flat-screen television display as described in claim 1 further comprising an electrical control circuit capable of categorizing incoming video signals corresponding to said module and to other similar modules positioned adjacent said module and directing the electrical signals to the drive circuit of said module and to an electrical drive circuit of each of the other adjacent modules according to the position of a television picture to be reproduced by the picture elements on said module and by picture elements on the other adjacent modules.