# US 10,504,391 B2 · Data driver and display device using the same

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- Number: US 10,504,391 B2
- Document ID: US10504391B2
- Status: Granted
- Kind: B2
- Application number: 15/786,050
- Filed: 2017-10-17
- Published: 2018-05-03
- Granted: 2019-12-10
- Earliest claimed: 2016-10-31
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Myunggi Lim; Kyoungdon Woo; Seokhyun Hong; Hyuckjun Kim
- Web page: https://patentgrep.com/patent/US10504391B2

## CPC

- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- 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 3/3225: using an active matrix
- 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 2310/0289: Details of voltage level shifters arranged for use in a driving circuit
- G09G 2310/0291: Details of output amplifiers or buffers arranged for use in a driving circuit
- G09G 2320/0233: Improving the luminance or brightness uniformity across the screen
- G09G 2320/045: Compensation of drifts in the characteristics of light emitting or modulating elements
- G09G 2330/06: Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
- G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof
- G09G 2370/047: using display data channel standard [DDC] communication
- 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

A display device comprises a display panel that displays an image and has a data line and a sensing line, a data driver that drives the display panel, and a power supply part that delivers a driving reference voltage through a wiring line connected to the data driver. The data driver supplies a data signal to the data line, supplies the driving reference voltage through the sensing line, senses the sensing line based on an internally generated sensing reference voltage, and integrates a sensing result.

## Claims

### Claim 1

A display device comprising:
a display panel that displays an image and has a data line and a sensing line;
a data driver that drives the display panel; and
a power supply part that delivers a driving reference voltage through a wiring line connected to the data driver,
wherein the data driver supplies a data signal to the data line, supplies the driving reference voltage through the sensing line, senses the sensing line based on an internally generated sensing reference voltage, and integrates a sensing result wherein the data driver comprises:
an integration circuit part for sensing the sensing line based on the sensing reference voltage; and
an offset correction part that corrects for variations in the sensing reference voltage, along with the integration circuit part, by using the driving reference voltage as a reference,
wherein the integration circuit part comprises:
an amp circuit, a first terminal of which is connected to a first terminal of the offset correction part;
an integrating capacitor, one end of which is connected to a second terminal of the amp circuit, and another end of which is connected to an output terminal of the amp circuit; and
a reset switch, one end of which is connected to the second terminal of the amp circuit, and another end of which is connected to the output terminal of the amp circuit.

### Claim 2 (depends on 1)

The display device of claim 1, wherein the data driver comprises a voltage generator that generates the sensing reference voltage based on an internal power source.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the offset correction part comprises:
an offset cancellation capacitor that stores a voltage for offset cancellation;
a first switch group that performs a switching operation for storing an external input voltage and an offset for the amp circuit in the offset cancellation capacitor; and
a second switch group that performs a switching operation for applying the offset to the sensing reference voltage.

### Claim 4 (depends on 3)

The display device of claim 3, wherein the first switch group comprises:
a 1-1 switch, one end of which is connected to a second terminal of the offset correction part, and another end of which is connected to one end of the offset cancellation capacitor;
a 1-2 switch, one end of which is connected to the first terminal of the offset correction part, and another end of which is connected to a fourth terminal of the offset correction part; and
a 1-3 switch, one end of which is connected to another end of the offset cancellation capacitor, and another end of which is connected to a third terminal of the offset correction part.

### Claim 5 (depends on 4)

The display device of claim 4, wherein the second switch group comprises:
a 2-1 switch, one end of which is connected to the one end of the 1-3 switch and the another end of the offset cancellation capacitor, and another end of which is connected to the first terminal of the offset correction part and the one end of the 1-2 switch; and
a 2-2 switch, one end of which is connected to the one end of the offset cancellation capacitor and another end of the 1-1 switch, and another end of which is connected to the another end of the 1-2 switch.

### Claim 6 (depends on 3)

The display device of claim 3, wherein, when the reset switch of the integration circuit part is turned on, the first switch group and the second switch group are driven in opposite manners.

### Claim 7

A data driver comprising:
an integration circuit part that applies an externally supplied driving reference voltage to an external sensing line, senses the external sensing line based on an internally generated sensing reference voltage, and integrates a sensing result; and
an offset correction part that corrects for variations in the sensing reference voltage, along with the integration circuit part, by using the driving reference voltage as a reference,
wherein the integration circuit part comprises:
an amp circuit, a first terminal of which is connected to a first terminal of the offset correction part;
an integrating capacitor, one end of which is connected to a second terminal of the amp circuit, and another end of which is connected to an output terminal of the amp circuit; and
a reset switch, one end of which is connected to the second terminal of the amp circuit, and another end of which is connected to the output terminal of the amp circuit.

### Claim 8 (depends on 7)

The data driver of claim 7, wherein the offset correction part comprises:
an offset cancellation capacitor that stores a voltage for offset cancellation;
a first switch group that performs a switching operation for storing an external input voltage and an offset for the amp circuit in the offset cancellation capacitor; and
a second switch group that performs a switching operation for applying the offset to the sensing reference voltage.

### Claim 9 (depends on 8)

The data driver of claim 8, wherein the first switch group comprises:
a 1-1 switch, one end of which is connected to a second terminal of the offset correction part, and another end of which is connected to one end of the offset cancellation capacitor;
a 1-2 switch, one end of which is connected to the first terminal of the offset correction part, and another end of which is connected to a fourth terminal of the offset correction part; and
a 1-3 switch, one end of which is connected to another end of the offset cancellation capacitor, and another end of which is connected to a third terminal of the offset correction part.

### Claim 10 (depends on 9)

The data driver of claim 9, wherein the second switch group comprises:
a 2-1 switch, one end of which is connected to the one end of the 1-3 switch and the another end of the offset cancellation capacitor, and another end of which is connected to the first terminal of the offset correction part and the one end of the 1-2 switch; and
a 2-2 switch, one end of which is connected to the one end of the offset cancellation capacitor and the another end of the 1-1 switch, and another end of which is connected to the another end of the 1-2 switch.

### Claim 11 (depends on 8)

The data driver of claim 8, wherein, when the reset switch of the integration circuit part is turned on, the first switch group and the second switch group are driven in opposite manners.