# US 2017/0287401 A1 · Display device

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- Number: US 2017/0287401 A1
- Document ID: US20170287401A1
- Status: Published application
- Kind: A1
- Application number: 15/471,067
- Filed: 2017-03-28
- Published: 2017-10-05
- Earliest claimed: 2016-03-30
- Assignees: Joled Inc.
- Applicants: Joled Inc.
- Inventors: Masafumi MATSUI; Hitoshi TSUGE; Kohei EBISUNO
- Web page: https://patentgrep.com/patent/US20170287401A1

## CPC

- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G06F 3/1423: {controlling a plurality of local displays, e.g. CRT and flat panel display}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 5/003: {Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto (specific for a CRT G09G1/165; for a flat panel G09G3/2092)}
- G09G 5/14: Display of multiple viewports
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2300/0842: forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G 2300/0861: with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
- G09G 2310/08: Details of timing specific for flat panels, other than clock recovery
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/043: Preventing or counteracting the effects of ageing
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- 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)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A plurality of pixel circuits included in a display device each includes: a drive transistor; a capacitor connected to a gate electrode and a source electrode of the drive transistor; a light-emitting element which is driven by the drive transistor; a write transistor having a gate electrode connected to a write control line for transmitting a write signal, one of a drain electrode and a source electrode connected to a data line for transmitting a data voltage corresponding to luminance, and the other of the drain electrode and the source electrode connected to the gate electrode of the drive transistor; and a compensation transistor having a gate electrode connected to the data line, and at least one of a drain electrode and a source electrode connected to the write control line, the compensation transistor being of same conductivity type as the write transistor.

## Claims

### Claim 1

A display device comprising a display unit including a plurality of pixel circuits,
wherein each of the plurality of pixel circuits includes:
a drive transistor;
a capacitor connected to a gate electrode and a source electrode of the drive transistor;
a light-emitting element which is driven by the drive transistor;
a write transistor having a gate electrode connected to a write control line for transmitting a write signal, one of a drain electrode and a source electrode connected to a data line for transmitting a data voltage corresponding to luminance, and the other of the drain electrode and the source electrode connected to the gate electrode of the drive transistor; and
a compensation transistor having a gate electrode connected to the data line, and at least one of a drain electrode and a source electrode connected to the write control line, the compensation transistor being of same conductivity type as the write transistor.

### Claim 2 (depends on 1)

The display device according to claim 1,
wherein the write transistor and the compensation transistor are metal-oxide semiconductor field-effect transistors having same channel length, same channel width, and same gate insulating film thickness.

### Claim 3 (depends on 1)

The display device according to claim 1,
wherein the write transistor and the compensation transistor are metal-oxide semiconductor field-effect transistors having same gate electrode material, same gate insulating film material, and same channel semiconductor layer material.

### Claim 4 (depends on 1)

The display device according to claim 1,
wherein a characteristic of a parasitic capacitance of the write transistor with respect to gate-source voltage and a characteristic of a parasitic capacitance of the compensation transistor with respect to gate-source voltage are mutually same.