# US 12,183,228 B2 · Method and apparatus for inspecting display device

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- Number: US 12,183,228 B2
- Document ID: US12183228B2
- Status: Granted
- Kind: B2
- Application number: 18/239,725
- Filed: 2023-08-29
- Published: 2023-12-21
- Granted: 2024-12-31
- Earliest claimed: 2021-09-17
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Jun Young Ko; Tae Joon Kim; Eun Sol Seo; Yu Jin Sin; Jun Seong Lee; Jae Woo Choi
- Web page: https://patentgrep.com/patent/US12183228B2

## CPC

- G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G06F 3/0416: {Control or interface arrangements specially adapted for digitisers}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G06F 2203/04111: Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
- G09G 2300/0426: Layout of electrodes and connections
- 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 2330/021: Power management, e.g. power saving
- G09G 2330/10: Dealing with defective pixels
- 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

An apparatus for inspecting a display device including a touch sensor may include: a power source generator configured to generate a pixel voltage of the display device; and a variable impedance circuit electrically connected to an output terminal of the power source generator, wherein the variable impedance circuit may include: a variable resistance circuit electrically connected to the power source generator and an output terminal of the variable impedance circuit, and including resistors connected in parallel with each other; and a variable capacitor circuit electrically connected to the power source generator and a ground voltage source.

## Claims

### Claim 1

An apparatus for inspecting a display device including a touch sensor, the apparatus comprising:
a power source generator configured to generate a pixel voltage of the display device; and
a variable impedance circuit electrically connected to an output terminal of the power source generator,
wherein the variable impedance circuit comprises:
a variable resistance circuit electrically connected to the power source generator and an output terminal of the variable impedance circuit, and comprising resistors connected in parallel with each other; and
a variable capacitor circuit electrically connected to the power source generator and a ground voltage source.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the variable resistance circuit further comprises:
first switches electrically connected in parallel between the resistors and the output terminal of the variable impedance circuit, each of the first switches being electrically connected in series to any one of the resistors; and
a second switch electrically connected between the output terminal of the power source generator and the output terminal of the variable impedance circuit, the second switch being electrically connected in parallel with the resistors and the first switches.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein the second switch is directly connected to the output terminal of the power source generator and the output terminal of the variable impedance circuit.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the variable capacitor circuit comprises:
third switches electrically connected to the output terminal of the power source generator and electrically connected in parallel to each other; and
capacitors electrically connected in parallel between the third switches and the ground voltage source, each of the capacitors being electrically connected in series to any one of the third switches.

### Claim 5 (depends on 1)

The apparatus of claim 1, wherein the power source generator is configured to supply the pixel voltage to a pixel electrode of the display device via the variable impedance circuit.

### Claim 6 (depends on 5)

The apparatus of claim 5, wherein the pixel voltage is a low-potential pixel voltage.