# US 10,769,995 B2 · Display device and panel compensation method thereof

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- Number: US 10,769,995 B2
- Document ID: US10769995B2
- Status: Granted
- Kind: B2
- Application number: 16/347,547
- Filed: 2017-11-01
- Published: 2019-08-15
- Granted: 2020-09-08
- Earliest claimed: 2016-11-03
- Assignees: Silicon Works Co., Ltd.
- Applicants: Silicon Works Co., Ltd.
- Inventors: Kyung Jik Min; Won Kab Oh; Su Hun Yang; Jeong Hie Choi
- Web page: https://patentgrep.com/patent/US10769995B2

## CPC

- G09G 3/3233: with pixel circuitry controlling the current through the light-emitting element
- G09G 3/20: for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters}
- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 3/3275: Details of drivers for data electrodes
- G09G 3/3283: in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
- 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 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 2310/027: Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
- 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 2320/029: by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
- 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)

## Abstract

Disclosed are a display device and a panel compensation method of the display device. The panel compensation method of the display device includes a step of allowing at least one line pixel of a display panel to be a current source that generates a pixel current with the same value, and a step of correcting a deviation between all current sensing paths of a source driver by using the pixel current with the same value and correcting a characteristic deviation between all pixels after correcting the deviation between the current sensing paths.

## Claims

### Claim 1

A panel compensation method of a display device, comprising the steps of:
(a) using at least one line pixel as a current source that generates a pixel current with a same value by correcting a characteristic deviation of the at least one line pixel of a display panel; and
(b) correcting a deviation between current sensing paths of a source driver by using the pixel current with the same value provided from the at least one line pixel, and correcting a characteristic deviation between pixels by using the corrected current sensing paths.

### Claim 2 (depends on 1)

The panel compensation method of the display device of claim 1, wherein the step (a) comprises the steps of:
correcting characteristics of the source driver; and
correcting the characteristic deviation of the at least one line pixel by applying first reference data to the at least one line pixel.

### Claim 3 (depends on 2)

The panel compensation method of the display device of claim 2, wherein, in the step of correcting the characteristics of the source driver, the characteristics of the source driver are corrected by applying a reference voltage to a sensing line corresponding to the at least one line pixel.

### Claim 4 (depends on 3)

The panel compensation method of the display device of claim 3, wherein, in the step of correcting the characteristics of the source driver, the source driver self-corrects characteristics of an analog-to-digital converter by using first digital data corresponding to the reference voltage.

### Claim 5 (depends on 2)

The panel compensation method of the display device of claim 2, wherein the first reference data is data in which the characteristics of the source driver have been corrected and has a same level.

### Claim 6 (depends on 1)

The panel compensation method of the display device of claim 1, wherein the step (a) comprises the steps of:
applying a reference voltage to a sensing line corresponding to the at least one line pixel;
sensing a voltage of the sensing line to which the reference voltage is applied;
correcting the characteristics of the source driver by using first digital data corresponding to the reference voltage;
applying first reference data, in which the characteristics of the source driver have been corrected, to the at least one line pixel;
sensing a voltage of to the at least one line pixel; and
correcting the characteristic deviation of the at least one line pixel by using second digital data corresponding to the voltage of to the at least one line pixel.

### Claim 7 (depends on 1)

The panel compensation method of the display device of claim 1, wherein the step (b) comprises the steps of:
correcting the deviation between the current sensing paths of the source driver by applying the pixel current with the same value, which is provided from the at least one line pixel, to sensing lines; and
correcting the characteristic deviation between the pixels by applying second reference data to the pixels.

### Claim 8 (depends on 7)

The panel compensation method of the display device of claim 7, wherein the second reference data is data in which the deviation between the current sensing paths of the source driver has been corrected and has a same level.

### Claim 9 (depends on 1)

The panel compensation method of the display device of claim 1, wherein the step (b) comprises the steps of:
applying the pixel current with the same value, which is provided from the at least one line pixel, to sensing lines;
sensing the pixel current applied to the sensing lines;
correcting the deviation between the current sensing paths by using third digital data corresponding to the pixel current;
applying second reference data, in which the deviation between the current sensing paths has been corrected, to the pixels;
sensing a current of the pixels; and
correcting the deviation between the current sensing paths by using fourth digital data corresponding to the current of the pixels.

### Claim 10

A display device comprising:
a sensing circuit that performs at least one of first driving for sensing a voltage of a sensing line corresponding to at least one line pixel of a display panel and to which a reference voltage is applied, second driving for sensing a pixel voltage corresponding to first reference data applied to the at least one line pixel, third driving for sensing a pixel current with a same value applied to sensing lines, and fourth driving for sensing a current of pixels corresponding to second reference data applied to the pixels;
an analog-to-digital converter that converts sensing signals by at least one of the first driving to the fourth driving into first to fourth digital data; and
a compensation circuit that controls the reference voltage to be applied to the sensing line corresponding to the at least one line pixel, controls the first reference data to be applied to the at least one line pixel, controls the pixel current with the same value to be applied to the sensing lines, controls the second reference data to be applied to the pixels, and corrects characteristics of the sensing circuit, a characteristic deviation of the at least one line pixel, a deviation between current sensing paths of the sensing circuit, and a characteristic deviation between the pixels by using the first to fourth digital data received from the analog-to-digital converter.

### Claim 11 (depends on 10)

The display device of claim 10, wherein the at least one line pixel of the display panel includes at least one of effective line pixels and dummy line pixels of the display panel.

### Claim 12 (depends on 10)

The display device of claim 10, further comprising:
a reference voltage providing unit that provides the reference voltage to the sensing line corresponding to the at least one line pixel through common routing.

### Claim 13 (depends on 12)

The display device of claim 12, wherein the reference voltage is a common voltage having a predetermined level.

### Claim 14 (depends on 10)

The display device of claim 10, wherein, in the sensing circuit, channels corresponding to sensing lines of the display panel are formed, and
each of the channels comprises:
a current-to-voltage converter that converts a signal of a corresponding sensing line into a voltage;
a sample and hold circuit that samples and holds an output voltage of the current-to-voltage converter; and
a switch that directly transfers the signal of the sensing line to the sample and hold circuit.

### Claim 15 (depends on 14)

The display device of claim 14, wherein the switch is turned on in the first driving and the second driving and is turned off in the third driving and the fourth driving.

### Claim 16 (depends on 10)

The display device of claim 10, wherein the first reference data is data in which the characteristics of the sensing circuit have been corrected, and the second reference data is data in which the deviation between the current sensing paths of the sensing circuit has been corrected.

### Claim 17

A display device comprising:
a panel compensation circuit,
wherein the panel compensation circuit corrects characteristics of a source driver by applying a reference voltage to a sensing line corresponding to at least one line pixel of a display panel,
corrects a characteristic deviation of the at least one line pixel by applying first reference data, in which the characteristics of the source driver have been corrected, to the at least one line pixel,
corrects a deviation between current sensing paths of the source driver by applying a pixel current with a same value of the at least one line pixel to the sensing lines, and
corrects a characteristic deviation between pixels by applying second reference data, in which the deviation between the current sensing paths of the source driver has been corrected, to the pixels.

### Claim 18 (depends on 17)

The display device of claim 17, wherein the panel compensation circuit is included in at least one of a timing controller and the source driver.