# US 5,706,020 A · Plasma addressed display

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,706,020 A
- Document ID: US5706020A
- Status: Granted
- Kind: A
- Application number: 08/644,960
- Filed: 1996-05-13
- Granted: 1998-01-06
- Earliest claimed: 1995-05-12
- Assignees: Sony Corporation
- Inventors: Jun Iwama
- Web page: https://patentgrep.com/patent/US5706020A

## CPC

- G09G 3/3662: {using plasma-addressed liquid crystal displays}
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

To optimize a discharge current flowing in each of discharge channels for performing linear sequential scan of a display cell, a panel 0 has a laminated structure in which a display cell having signal electrodes D arranged in columns and a plasma cell having discharge channels (K,A) arranged in rows are laminated to each other. Pixels 1 are defined in a matrix at positions where the signal electrodes D cross the discharge channels (K,A). A vertical drive circuit 2 repeatedly performs field scans in each of which pixels 1 are selected in a row-sequential manner by sequentially applying drive pulses each to the signal channels (K,A) for generating plasma discharges. A horizontal drive circuit 3 applies image signals each to the signal electrodes D, to write the image signals in the selected pixels 1. The vertical drive circuit 2 includes a detecting resistance 14 for detecting a discharge state of each discharge channel (K,A) for each field scan. The vertical drive circuit 2 also includes a control means having a comparator 17, a memory 19, a flip-flop 13 and the like for controlling, on the basis of a detected result obtained in the previous field scan, a width of each of the drive pulses Q1 to Qn to be applied in the next field scan for each discharge channel.

## Claims

### Claim 1

A plasma addressed electro-optical display device, comprising:
a flat panel having:
an electro-optical cell including signal electrodes, and
a plasma discharge cell having plasma discharge channels arranged in rows to define pixels by intersections of the signal electrodes and the plasma discharge channels;
a vertical drive circuit for scanning each of said pixels in a field scan by sequentially applying drive
pulses to said discharge channels for generating plasma discharges, said vertical drive circuit including:
a detecting means for detecting a discharge state of each of said discharge channels for each field scan, and
a control means for controlling, on a basis of a detected result obtained in a previous field scan, widths of drive pulses applied in a next field scan for each of said discharge channels; and
a horizontal drive circuit for applying image signals to selected ones of said signal electrodes to write the image signals in selected ones of said pixels.

### Claim 2 (depends on 1)

A plasma addressed electro-optical display device as claimed in claim 1, wherein said detecting means comprises a resistance connected to receive a drive current during discharge.

### Claim 3 (depends on 2)

A plasma addressed electro-optical display device as claimed in claim 2, wherein said control means comprises a flip-flop connected to activate the discharge, a comparator connected to receive a voltage across the resistance, and a memory connected at the output of the comparator.

### Claim 4 (depends on 1)

A plasma addressed electro-optical display device as claimed in claim 1, wherein said control means controls a width of a driving pulse by changing a rising edge of a next driving pulse on a basis of a fixed falling edge of the driving pulse in accordance with a result of detection by said detection means.

### Claim 5 (depends on 1)

A plasma addressed electro-optical display device as claimed in claim 1, wherein said detecting means includes means for detecting a discharge current representing a discharge state of each discharge channel and outputting a detection signal corresponding to the discharge current as a detected result.

### Claim 6 (depends on 1)

A plasma addressed electro-optical display device as claimed in claim 1, said control means includes means for controlling a width of the drying pulse on a basis of a result of a comparison of said detection signal and a predetermined reference signal.