Display device and support plate with transverse electrode arrangement

• US 5,353,138 A
• Filed: 10/18/1993
• Issued: 10/04/1994
• Est. Priority Date: 04/24/1991
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Van Winsum, Jacobus A.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): MAI, HUY KIM
• Application Number:
  US08/141,490
• Time in Patent Office: 351 Days
• Field of Search: 359/79, 359/54, 359/58, 359/60, 359/68, 340/718, 340/719, 340/784, 257/922
• US Class Current: 349/41
• CPC Class Codes: G02F 1/136254 Checking; Testing
• CPC Class Codes: G02F 1/1365 in which the switching element is a two-electrode device G02F1/136277 takes precedence

Abstract

Voltage lines (6) for the reference voltage running parallel to the row electrodes (7) in a display device of the reset type provide the possibility of separately testing and repairing the picture electrodes (4) and the associated switching units (5, 11) for each pixel before connection to the reference voltage. Moreover, the device thus obtained can be driven with single-row inversion, while a larger aperture is possible and the occurrence of artefacts can be reduced.

Claims

1. A display device comprising an electro-optical medium, disposed between first and second support plates, and a system of pixels arranged in rows and columns, said display device comprising:

a. opposing first and second systems of picture electrodes arranged on facing surfaces of the first and second support plates, respectively, for defining respective ones of the pixels;

b. a system of row electrodes arranged on the first support plate, each of said row electrodes being electrically connected to a multiplicity of the picture electrodes of the first system which define a common row of the pixels;

c. a system of column electrodes arranged on the second support plate, each of said column electrodes being electrically connected through respective switching elements on said second support plate to ones of the picture electrodes of the second system which define a common column of the pixels;

d. a system of reference electrodes arranged on the second support plate, said reference electrodes being arranged transversely of and crossing the column electrodes, each of said reference electrodes;

i. being electrically connected through respective switching elements on said second support plate to ones of the picture electrodes of the second system which define a common row of the pixels; and

ii. being separated from the crossed column conductors by nonconductive means.

2. A display device as in claim 1 where all of the picture electrodes of the second system represent a common color.

3. A display device as in claim 1 where ones of the picture electrodes on the second support plate defining alternate rows of the pixels are staggered relative to each other and where the column electrodes on said second support plate follow meandor patterns between said staggered picture electrodes.

4. A display device as in claim 1 where, on the second support plate, each of said pixels is defined by a group of the picture electrodes, the picture electrodes in each group representing different colors.

5. A picture display device as in claim 4 where, for each column of pixels, the groups of picture electrodes in said column are arranged such that all of said picture electrodes defining a common color are aligned with each other.

6. A picture display device as in claim 4 where each of the column electrodes is electrically connected to picture electrodes representing a single one of said colors.

7. A display device as in claim 1 where the nonconductive means comprises a semiconductor material.

8. A support plate for use in an active matrix display device having a system of pixels arranged in rows and columns, said support plate supporting:

a. a system of picture electrodes arranged for defining respective ones of the pixels;

b. a system of column electrodes, each being electrically connected through respective switching elements on said support plate to ones of the picture electrodes which define a common column of the pixels;

c. a system of reference electrodes arranged transversely of and crossing the column electrodes, each of said reference electrodes;

i. being electrically connected through respective switching elements on said support plate to ones of the picture electrodes of the second system which define a common row of the pixels; and

ii. being separated from the crossed column conductors by nonconductive means.

9. A support plate as in claim 8 where the nonconductive means comprises a semiconductor material.