# US 12,190,837 B2 · Screen flicker debugging method, apparatus and system of display panel

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- Number: US 12,190,837 B2
- Document ID: US12190837B2
- Status: Granted
- Kind: B2
- Application number: 18/212,205
- Filed: 2023-06-21
- Published: 2024-09-19
- Granted: 2025-01-07
- Earliest claimed: 2023-03-13
- Assignees: Hkc Corporation Limited
- Applicants: Hkc Corporation Limited
- Inventors: Shixin Wei; Haijiang Yuan
- Web page: https://patentgrep.com/patent/US12190837B2

## CPC

- G09G 3/36: using liquid crystals
- G01J 11/00: Measuring the characteristics of individual optical pulses or of optical pulse trains
- 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 3/2096: {Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167)}
- G09G 3/3291: in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors}
- G09G 3/3696: {Generation of voltages supplied to electrode drivers}
- G09G 2300/0819: used for counteracting undesired variations, e.g. feedback or autozeroing
- G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
- G09G 2320/0257: Reduction of after-image effects
- G09G 2320/043: Preventing or counteracting the effects of ageing
- G09G 2340/0435: Change or adaptation of the frame rate of the video stream
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- 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)
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

The present application provides a screen flicker debugging method of a display panel, an apparatus and a system. The display panel includes a first common voltage and a second common voltage. The voltage difference between the second common voltage and the first common voltage is configured as a reference voltage for deflection of the liquid-crystal molecules. The screen flicker debugging method of the display panel includes: acquiring a refresh rate interval of the display panel, and determining a minimum refresh rate; controlling the display panel to display a flickering picture with the minimum refresh rate; adjusting the reference voltage and acquiring flickering values of the flickering picture at different reference voltages; and determining the minimum flickering value and setting the corresponding reference voltage as the optimal reference voltage for the display panel. The flickering phenomenon of the display panel at high and low refresh rates is reduced.

## Claims

### Claim 1

A screen flicker debugging method for a display panel, the display panel comprising a first common voltage and a second common voltage, a voltage difference between the second common voltage and the first common voltage being configured as a reference voltage for deflection of liquid-crystal molecules, the method comprising:
acquiring a refresh rate interval of the display panel, and determining a minimum refresh rate;
controlling the display panel to display a flickering picture at the minimum refresh rate;
adjusting the reference voltage, and acquiring flickering values of the flickering picture at different reference voltages; and
determining a minimum flickering value, and setting corresponding reference voltage as an optimal reference voltage for the display panel.

### Claim 2 (depends on 1)

The screen flicker debugging method for the display panel as claimed in claim 1, wherein
the adjusting the reference voltage, and acquiring the flickering values of the flickering picture at different reference voltages comprises:
keeping the second common voltage constant, adjusting the first common voltage, and acquiring the flickering values of the flickering picture at different reference voltages;
wherein, the first common voltage is a common voltage of a color film substrate of the display panel, and the second common voltage is a common voltage of an array substrate of the display panel.

### Claim 3 (depends on 1)

The screen flicker debugging method for the display panel as claimed in claim 1, wherein
after the determining the minimum flickering value, and setting the corresponding reference voltage as the optimal reference voltage for the display panel, the method further comprises:
adjusting the reference voltage to be greater than or equal to 3V.

### Claim 4 (depends on 3)

The screen flicker debugging method for the display panel as claimed in claim 3, wherein
the adjusting the reference voltage to be greater than or equal to 3V comprises:
keeping the first common voltage corresponding to the optimal reference voltage constant, adjusting the second common voltage, and making the reference voltage to be greater than or equal to 3V;
wherein, the first common voltage is a common voltage of a color film substrate of the display panel, and the second common voltage is a common voltage of an array substrate of the display panel.

### Claim 5 (depends on 4)

The screen flicker debugging method for the display panel as claimed in claim 4, wherein
adjusting the second common voltage when the display panel displays a normal picture during a power-on process.

### Claim 6 (depends on 4)

The screen flicker debugging method for the display panel as claimed in claim 4, wherein
the first common voltage ranges from 4V to 6V, and the second common voltage ranges from 9.8V to 12V.

### Claim 7 (depends on 4)

The screen flicker debugging method for the display panel as claimed in claim 4, wherein
the acquiring the refresh rate interval of the display panel, and determining the minimum refresh rate comprises:
acquiring the refresh rate interval of the display panel,
wherein, a minimum value of the refresh rate interval is the minimum refresh rate.

### Claim 8 (depends on 1)

The screen flicker debugging method for the display panel as claimed in claim 1, wherein
the refresh rate interval comprises any of 35 Hz˜240 Hz, 21 Hz˜144 Hz, 17 Hz˜120 Hz, 9 Hz˜60 Hz and 48 Hz˜144 Hz.

### Claim 9

A screen flicker debugging method for a display panel, the display panel comprising a first common voltage and a second common voltage, a voltage difference between the second common voltage and the first common voltage being configured as a reference voltage for deflection of liquid-crystal molecules, the method comprising:
acquiring a refresh rate interval of the display panel, and determining a minimum refresh rate;
controlling the display panel to display a flickering picture at the minimum refresh rate;
adjusting the reference voltage, and acquiring flickering values of the flickering picture at different reference voltages, comprising:
keeping the second common voltage constant, adjusting the first common voltage, and acquiring the flickering values of the flickering picture at different reference voltages;
determining a minimum flickering value, and setting corresponding reference voltage as an optimal reference voltage for the display panel, and
adjusting the reference voltage to be greater than or equal to 3V.

### Claim 10 (depends on 9)

The screen flicker debugging method as claimed in claim 9, wherein
the first common voltage is a common voltage of a color film substrate of the display panel, and the second common voltage is a common voltage of an array substrate of the display panel.

### Claim 11 (depends on 10)

The screen flicker debugging method as claimed in claim 10, wherein
the adjusting the reference voltage to be greater than or equal to 3V comprises:
keeping the first common voltage corresponding to the optimal reference voltage constant, adjusting the second common voltage, and making the reference voltage to be greater than or equal to 3V.