# US 11,906,561 B2 · Display module inspection device and display module inspection method

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- Number: US 11,906,561 B2
- Document ID: US11906561B2
- Status: Granted
- Kind: B2
- Application number: 17/464,293
- Filed: 2021-09-01
- Published: 2022-06-30
- Granted: 2024-02-20
- Earliest claimed: 2020-12-28
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Bongil Kang; Joo-Hyeon Jeong; Jun-Young Ko; Sangkook Kim; Gayeon Yun
- Web page: https://patentgrep.com/patent/US11906561B2

## CPC

- G01R 27/2605: {Measuring capacitance (capacitive sensors G01D5/24)}
- G01R 31/2825: {in household appliances or professional audio/video equipment (testing LAN's H04L43/50; testing TV systems H04N17/00; testing loudspeakers H04R29/00)}
- 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)}
- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- H10K 59/40: OLEDs integrated with touch screens
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- 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)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An inspection device inspects a display for defects. The display includes a power supply, a circuit board having a stabilizer to stabilize the power supply, a display panel which is electrically connected to the circuit board and has a first electrode, and an input sensor which is disposed on the display panel and has a second electrode. The inspection logic measures a value of capacitance between the first electrode and the second electrode of the display, and includes a frequency setter that sets a driving frequency of the second electrode to a frequency in a predetermined range.

## Claims

### Claim 1

An inspection device, comprising:
a display including a power supply, a circuit board having a stabilizer configured to stabilize the power supply, a display panel which is electrically connected to the circuit board and has a first electrode, and an input sensor which is disposed on the display panel and has a second electrode; and
inspection logic configured to measure a value of capacitance between the first electrode and the second electrode of the display, wherein the inspection logic comprises a frequency setter configured to set a driving frequency of the second electrode to a frequency in a first predetermined range.

### Claim 2 (depends on 1)

The inspection device of claim 1, wherein the input sensor is directly disposed on the display panel.

### Claim 3 (depends on 1)

The inspection device of claim 1, wherein the first predetermined range is about 400 kHz to about 700 kHz.

### Claim 4 (depends on 1)

The inspection device of claim 1, wherein the frequency in the first predetermined range is about 475 kHz.

### Claim 5 (depends on 1)

The inspection device of claim 1, wherein the inspection logic comprises a driving voltage setter configured to set a driving voltage of the second electrode to a voltage in a second predetermined range.

### Claim 6 (depends on 5)

The inspection device of claim 5, wherein the second predetermined range is about 2.7 V to about 3.6 V.

### Claim 7 (depends on 5)

The inspection device of claim 5, wherein the voltage in the second predetermined range is about 3.6 V.

### Claim 8 (depends on 1)

The inspection device of claim 1, wherein the display is in one of at least two states:
a first state in which the stabilizer is electrically connected to the power supply; or
a second state in which the stabilizer is not electrically connected to the power supply.

### Claim 9 (depends on 8)

The inspection device of claim 8, wherein:
the value of the capacitance comprises one of a first capacitance value or a second capacitance value greater than the first capacitance value,
the inspection logic is configured to determine that the display is in the first state when the measured value of the capacitance has the first capacitance value and is configured to determine the display is in the second state when the measured value of the capacitance has the second capacitance value.

### Claim 10 (depends on 9)

The inspection device of claim 9, wherein a minimum value of the second capacitance value is greater than a maximum value of the first capacitance value.

### Claim 11 (depends on 1)

The inspection device of claim 1, wherein the inspection logic is configured to determine a defect in operation of the input sensor based on the measured value of the capacitance.

### Claim 12 (depends on 11)

The inspection device of claim 11, wherein the inspection logic is configured to determine that the stabilizer is disconnected to the power supply based on the measured value of the capacitance, and wherein disconnection of the stabilizer corresponds to the defect in operation of the input sensor.

### Claim 13 (depends on 11)

The inspection device of claim 11, wherein the driving frequency is set by the inspection logic to detect disconnection of the stabilizer.

### Claim 14

An inspection device, comprising:
a display including a power supply, a circuit board having a stabilizer configured to stabilize the power supply, a display panel which is electrically connected to the circuit board and has a first electrode, and an input sensor which is disposed on the display panel and has a second electrode; and
inspection logic configured to measure a value of capacitance between the first electrode and the second electrode of the display, wherein the inspection logic is configured to set a driving voltage of the power supply to a voltage in a first predetermined range.

### Claim 15 (depends on 14)

The inspection device of claim 14, wherein the first predetermined range is about −1.1 V to about −4.1 V.

### Claim 16 (depends on 14)

The inspection device of claim 14, wherein the inspection logic is configured to determine the defect in operation of the input sensor based on the measured value of the capacitance.

### Claim 17 (depends on 16)

The inspection device of claim 16, wherein the inspection logic is configured to determine that the stabilizer is disconnected to the power supply based on the measured value of the capacitance, and wherein disconnection of the stabilizer corresponds to the defect in operation of the input sensor.

### Claim 18 (depends on 16)

The inspection device of claim 16, wherein the driving voltage is set by the inspection logic to detect disconnection of the stabilizer.

### Claim 19

An inspection method, comprising:
providing a display including a power supply, a circuit board having a stabilizer configured to stabilize the power supply, a display panel which is electrically connected to the circuit board and has a first electrode, and an input sensor which is disposed on the display panel and has a second electrode;
setting, by inspection logic, a driving frequency of the second electrode to a frequency in a first predetermined range; and
measuring, by the inspection logic, a value of capacitance between the first electrode and the second electrode.

### Claim 20 (depends on 19)

The inspection method of claim 19, wherein the first predetermined range is about 400 kHz to about 700 kHz.

### Claim 21 (depends on 19)

The inspection method of claim 19, wherein the input sensor is directly disposed on the display panel.

### Claim 22 (depends on 19)

The inspection method of claim 19, wherein the frequency in the first predetermined range is about 475 kHz.

### Claim 23 (depends on 19)

The inspection method of claim 19, further comprising:
setting, by the inspection logic, a driving voltage of the second electrode to a voltage in a second predetermined range.

### Claim 24 (depends on 23)

The inspection method of claim 23, wherein the second predetermined range is about 2.7 V to about 3.6 V.

### Claim 25 (depends on 23)

The inspection method of claim 23, wherein the driving voltage is about 3.6 V.

### Claim 26 (depends on 19)

The inspection method of claim 19, wherein the display is in one of at least two states:
a first state in which the stabilizer is electrically connected to the power supply; or
a second state in which the stabilizer is not electrically connected to the power supply.

### Claim 27 (depends on 26)

The inspection method of claim 26, wherein measuring, by the inspection logic, the value of the capacitance between the first electrode and the second electrode comprises:
determining the display is in the first state when the measured value of the capacitance has a first capacitance value, and
determining the display is in the second state when the measured value of the capacitance has a second capacitance value.

### Claim 28 (depends on 27)

The inspection method of claim 27, wherein a maximum value of the first capacitance value is less than a minimum value of the second capacitance value.

### Claim 29

An apparatus, comprising:
inspection logic configured to determine existence of a defect in a display, the display including a power supply, a circuit board having a stabilizer configured to stabilize the power supply, a display panel which is electrically connected to the circuit board and has a first electrode, and an input sensor which is disposed on the display panel and has a second electrode,
wherein the inspection logic comprises a frequency setter configured to set a driving frequency of the second electrode to a frequency in a first predetermined range, and wherein the inspection logic is configured to measure a value of capacitance between the first electrode and the second electrode of the display to determine existence of the defect.