Granted Patent B1

US 12,469,440 · App. 18/950,209 · Granted Nov 11, 2025

Inventor: Chia-Chun Chang (Hsinchu, TW)

Assignee: AUO Corporation

G09G3/32G09G2300/0452G09G2320/0233G09G2320/0247

Abstract

Claims (38)

1 . A display apparatus, comprising:

a plurality of pixel circuits, arranged in a plurality of arrays and divided into a plurality of pixel groups, each of the plurality of pixel circuits having a first color light-emitting diode, a second color light-emitting diode, and a third color light-emitting diode;

a timing controller, used to provide a plurality of display data; and

a plurality of display driving circuits, arranged in a plurality of arrays and individually coupled to the timing controller and a corresponding one of the plurality of pixel groups to drive the plurality of pixel circuits in the corresponding one of the plurality of pixel groups to sequentially illuminate one of the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, and the plurality of third color light-emitting diodes in a plurality of illumination periods based on a corresponding one of the plurality of display data,

wherein during each of the plurality of illumination periods, the plurality of pixel groups alternately illuminate a part of the plurality of first color light-emitting diodes, a part of the plurality of second color light-emitting diodes, and a part of the plurality of third color light-emitting diodes,

wherein the timing controller is further used to provide a timing token and a clock signal, and the timing token is transmitted row by row through the plurality of display driving circuits to activate the plurality of display driving circuits row by row,

wherein each of the plurality of display data comprises a header field and a plurality of working fields, wherein the header field determines the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes illuminated by each of the plurality of pixel groups during the each of the plurality of illumination periods and determines a current level for illuminating the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, and the plurality of third color light-emitting diodes, and the plurality of working fields respectively determine a current pulse width for illuminating the plurality of first color light-emitting diodes, illuminating the plurality of second color light-emitting diodes, and illuminating the plurality of third color light-emitting diodes in the plurality of pixel circuits of the each of the plurality of pixel groups,

wherein each of the plurality of display driving circuits comprises:

a frequency converter, receiving the clock signal to provide an internal clock signal;

a token transmission circuit, receiving the timing token and the internal clock signal to activate the each of the plurality of display driving circuits and outputting the timing token;

a data receiving circuit, receiving the corresponding one of the plurality of display data and the internal clock signal to provide a sequential data and a current data based on the header field of the corresponding one of the plurality of display data, and to provide a duty cycle data based on the plurality of working fields of the corresponding one of the plurality of display data;

a driving multiplexer circuit, coupled to the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, and the plurality of third color light-emitting diodes of the corresponding one of the plurality of pixel groups;

a duty cycle switch circuit, coupled to the driving multiplexer circuit;

a current sink circuit, coupled to the duty cycle switch circuit; and

a driving control circuit, receiving the clock signal and coupled to the data receiving circuit, the driving multiplexer circuit, the duty cycle switch circuit, and the current sink circuit,

wherein the driving control circuit controls the driving multiplexer circuit based on the sequential data to connect the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes of the corresponding one of the plurality of pixel groups to the duty cycle switch circuit,

wherein the driving control circuit controls the duty cycle switch circuit based on the duty cycle data to determine a duty cycle for each of the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, and the plurality of third color light-emitting diodes of the corresponding one of the plurality of pixel groups, and

wherein the driving control circuit controls the current sink circuit based on the current data to determine a first current level for driving the plurality of first color light-emitting diodes, a second current level for driving the plurality of second color light-emitting diodes, and a third current level for driving the plurality of third color light-emitting diodes.

2 . The display apparatus according to claim 1 , wherein the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes illuminated by each of the plurality of pixel groups during the each of the plurality of illumination periods are the same as the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes illuminated by a horizontally adjacent one of the plurality of pixel groups.

3 . The display apparatus according to claim 1 , wherein the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes illuminated by each of the plurality of pixel groups during the each of the plurality of illumination periods are the same as the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes illuminated by a vertically adjacent one of the plurality of pixel groups.

4 . The display apparatus according to claim 1 , wherein the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes illuminated by each of the plurality of pixel groups during the each of the plurality of illumination periods are the same as the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, or the plurality of third color light-emitting diodes illuminated by a diagonally adjacent one of the plurality of pixel groups.

5 . The display apparatus according to claim 1 , wherein the driving control circuit comprises:

a first register, storing the sequential data;

a sequence selector, coupled to the first register and the driving multiplexer circuit to control the driving multiplexer circuit based on the sequential data;

a second register, storing the duty cycle data;

a duty cycle counter, coupled to the second register and the duty cycle switch circuit to control the duty cycle switch circuit based on the duty cycle data;

a third register, storing the current data; and

a current level selector, coupled to the third register and the current sink circuit to control the current sink circuit based on the current data.

6 . The display apparatus according to claim 1 , wherein the current sink circuit comprises:

a first current source, providing a first current;

a first current switch, coupled between the duty cycle switch circuit and the first current source;

a second current source, providing a second current;

a second current switch, coupled between the duty cycle switch circuit and the second current source;

a third current source, providing a third current; and

a third current switch, coupled between the duty cycle switch circuit and the third current source,

wherein one or more of the first current switch, the second current switch, and the third current switch is controlled and turned on by the driving control circuit, and a magnitude of the first current, a magnitude of the second current, and a magnitude of the third current are different from each other.

7 . The display apparatus according to claim 6 , wherein the magnitude of the first current, the magnitude of the second current, and the magnitude of the third current are in a geometric series.

8 . The display apparatus according to claim 1 , wherein the plurality of first color light-emitting diodes, the plurality of second color light-emitting diodes, and the plurality of third color light-emitting diodes comprise a plurality of red light-emitting diodes, a plurality of green light-emitting diodes, and a plurality of blue light-emitting diodes.

Assignments (1)

Priority Claims (1)

References Cited (52)