Display driving integrated circuit and display device including the same

Patent metadata

Field	Value
Publication number	US-11244632-B2
Application number	US-202017026639-A
Country	US
Kind code	B2
Filing date	Sep 21, 2020
Priority date	Feb 26, 2020
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

A display driving integrated circuit includes a timing controller, a first source driver including a first inverting input, a first non-inverting input, and a first output, a second source driver including a second inverting input, a second non-inverting input, and a second output, and a switching circuit connected with the display panel through a first and second pads. Under control of the timing controller, the switching circuit performs one of a first switching operation of connecting the first inverting input and the first output with the first pad, connecting the second inverting input and the second output with the second pad, and applying first and second decoding voltages to the non-inverting inputs, respectively; and a second switching operation of applying a sensing reference voltage to the non-inverting inputs, and connecting the output terminals with an output node, and connecting the inverting inputs with one pad.

First claim

What is claimed is:

1. A display driving integrated circuit for a display panel, the display driving integrated circuit comprising:
a timing controller;
a first source driver including a first inverting input terminal, a first non-inverting input terminal, and a first output terminal;
a second source driver including a second inverting input terminal, a second non-inverting input terminal, and a second output terminal; and
a switching circuit that connects with the display panel through a first pad and a second pad, the switching circuit including a plurality of switches connected between the first and second pads and the first and second source drivers,
wherein, under control of the timing controller, the switching circuit is configured to perform one of:
a first switching operation of controlling the plurality of switches such that the first inverting input terminal and the first output terminal are connected with the first pad, a first decoding voltage is applied to the first non-inverting input terminal, the second inverting input terminal and the second output terminal are connected with the second pad, and a second decoding voltage is applied to the second non-inverting input terminal; and
a second switching operation of controlling the plurality of switches such that a sensing reference voltage is applied to the first non-inverting input terminal and the second non-inverting input terminal, the first output terminal and the second output terminal are connected with an output node, and the first inverting input terminal and the second inverting input terminal are connected with one pad of the first and second pads.

2. The display driving integrated circuit as claimed in claim 1 , wherein the switching circuit is configured to perform the first switching operation, and when the switching circuit performs the first switching operation, the first source driver outputs the first decoding voltage to the display panel through the first pad, and the second source driver outputs the second decoding voltage to the display panel through the second pad.

3. The display driving integrated circuit as claimed in claim 1 , wherein the timing controller controls the switching circuit such that the second switching operation is performed at least once, in one period of a vertical synchronization signal (VSYNC) received from an external device.

4. The display driving integrated circuit as claimed in claim 1 , wherein the switching circuit is configured to perform the second switching operation, and when the switching circuit performs the second switching operation, the first source driver and the second source driver receive pixel information, which is provided through the one pad of the first pad and the second pad, through the first inverting input terminal and the second inverting input terminal, and output the received pixel information through the first output terminal and the second output terminal.

5. The display driving integrated circuit as claimed in claim 4 , wherein the pixel information indicates a degree of degradation of a pixel, from among a plurality of pixels included in the display panel, that is connected with the one of the first pad and the second pad.

6. The display driving integrated circuit as claimed in claim 4 , further comprising:
an analog-to-digital converter configured to convert the pixel information output through the first output terminal and the second output terminal into sensing data; and
a memory configured to store the sensing data.

7. The display driving integrated circuit as claimed in claim 1 , wherein the plurality of switches include:
a first display output switch connected between the first output terminal and the first pad;
a first display feedback switch connected between the first output terminal and the first inverting input terminal;
a first sensing feedback switch connected between the first inverting input terminal and an input node;
a first sensing output switch connected between the first output terminal and the output node;
a first sensing input switch connected between the input node and the first pad;
a first sensing reset switch connected between the first pad and a first reset data node;
a first selection switch configured to select one of the first decoding voltage and the sensing reference voltage so as to be provided to the first non-inverting input terminal;
a second display output switch connected between the second output terminal and the second pad;
a second display feedback switch connected between the second output terminal and the second inverting input terminal;
a second sensing feedback switch connected between the second inverting input terminal and the input node;
a second sensing output switch connected between the second output terminal and the output node;
a second sensing input switch connected between the input node and the second pad;
a second sensing reset switch connected between the second pad and a second reset data node;
a second selection switch configured to select one of the second decoding voltage and the sensing reference voltage so as to be provided to the second non-inverting input terminal;
a reset switch connected between the input node and the output node; and
a capacitor connected between the input node and the output node.

8. The display driving integrated circuit as claimed in claim 7 , wherein the switching circuit is configured to perform the first switching operation, and when the switching circuit performs the first switching operation, the first and second display output switches and the first and second display feedback switches are turned on, the first selection switch selects the first decoding voltage so as to be provided to the first non-inverting input terminal, the second selection switch selects the second decoding voltage so as to be provided to the second non-inverting input terminal, and the first and second sensing feedback switches, the first and second sensing output switches, the first and second sensing input switches, the first and second sensing reset switches, and the reset switch are turned off.

9. The display driving integrated circuit as claimed in claim 7 , wherein:
the switching circuit is configured to perform the second switching operation,
the second switching operation includes a reset period and a sensing period, and
in the reset period, one of the first and second sensing reset switches is turned on, one of the first and second sensing input switches is turned on, the first and second sensing feedback switches, the first and second sensing output switches, and the reset switch are turned on, and the first and second display output switches and the first and second display feedback switches are turned off.

10. The display driving integrated circuit as claimed in claim 9 , wherein, in the reset period, the first sensing input switch of the first and second sensing input switches is turned on when the first sensing reset switch of the first and second sensing reset switches is turned on, and the second sensing input switch of the first and second sensing input switches is turned on when the second sensing reset switch of the first and second sensing reset switches is turned on.

11. The display driving integrated circuit as claimed in claim 9 , wherein, in the sensing period after the reset period, the first and second sensing reset switches and the reset switch are turned off.

12. A display driving integrated circuit for a display panel, the display driving integrated circuit comprising:
a timing controller;
a column control block including a plurality of source drivers, and configured to, under control of the timing controller, cont

Assignees

• Samsung Electronics Co Ltd

Inventors

• Eom Jeeyeon
• Kwon Soonchan
• Min Kyungjik
• Jang Yeongshin
• Choi Jeonghoon
• Kim Siwoo
• Lee Jaeyoun

Classifications

• G09G3/3275 Primary

  Details of drivers for data electrodes · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G3/006

  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) · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title