DISPLAY APPARATUS AND METHOD FOR DRIVING THE SAME

• US 20150279296A1
• Filed: 06/26/2014
• Published: 10/01/2015
• Est. Priority Date: 03/25/2014
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Kim, Heecheol, Suk, Song Young, Yeol, Yoo Seong, Jin, Choi Seung, Sik, Im Yun
• Granted Patent: US 9,524,685 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: 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
• CPC Class Codes: G09G 3/2085 Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination
• CPC Class Codes: G09G 3/3618 with automatic refresh of the display panel using sense/write circuits
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

The present invention relates to a display apparatus and a method for driving the same. The display apparatus comprises: a source driving circuit having at least one output; at least one pixel unit each including a plurality of sub-pixels, the respective sub-pixels in each pixel unit being connected to the same output of the source driving circuit by data lines, wherein a switch group is disposed in a data line connecting each sub-pixel with the output of the source driving circuit, each switch group including at least two switches parallel with each other; wherein the source driving circuit charges each pixel unit based on the on-off states of the respective switches between the source driving circuit and each pixel unit through a plurality of charging phases, wherein for one switch group corresponding to one of the sub-pixels in each pixel unit, each switch in the one switch group is respectively switched on in different charging phases to perform at least two times of charge on the one of the sub-pixels in at least two charging phases. The display apparatus and the method for driving the same can increase charging time for each sub-pixel, thus avoiding a bad display due to insufficient charge of the sub-pixels.

Claims

1. A display apparatus comprising:

a source driving circuit having at least one output;

at least one pixel unit each including a plurality of sub-pixels, the respective sub-pixels of each pixel unit being connected to the same output of the source driving circuit by respective data lines,

wherein a switch group is disposed in the data line connecting each sub-pixel with the output of the source driving circuit, and each switch group includes at least two switches parallel with each other;

wherein the source driving circuit charges each pixel unit based on on-off states of the respective switches between the source driving circuit and the pixel unit through a plurality of charging phases,

wherein for one of the switch groups corresponding to one of the sub-pixels in each pixel unit, each switch in the one of the switch groups is respectively switched on in different charging phases respectively to perform at least two times of charging on the one of the sub-pixels in at least two charging phases.

2. The display apparatus according to claim 1, wherein

the source driving circuit is configured to perform a primary charging on one of the sub-pixels in each pixel unit while simultaneously performing a pre-charging on at least another one of the sub-pixels in the pixel unit in each charging phase, and

the source driving circuit outputs a data signal corresponding to the sub-pixel on which the primary charging is being performed during each charging phase.

3. The display apparatus according to claim 2, further comprising:

a signal controller including a plurality of signal outputs, each connected with a control terminal of one of the plurality of switches corresponding to each pixel unit correspondingly to control one of the switches in the switch group corresponding to one of the sub-pixels and one of the switches in the switch group corresponding to another one of the sub-pixels in each pixel unit to be simultaneously switched on in each charging phase.

4. The display apparatus according to claim 3, wherein the same signal output is connected to the corresponding switches of different pixel units.

5. The display apparatus according to claim 3, wherein each pixel unit includes two to six sub-pixels.

6. The display apparatus according to claim 3, wherein each switch group includes two switches of first and second switches.

7. The display apparatus according to claim 6, wherein each pixel unit includes a red sub-pixel, a green sub-pixel and a blue sub-pixel,

the outputs of the first and second switches in the switch group corresponding to the red sub-pixel are connected with a drain of a thin film transistor in the red sub-pixel,

the outputs of the first and second switches in the switch group corresponding to the green sub-pixel are connected with a drain of a thin film transistor in the green sub-pixel;

and

the outputs of the first and second switches in the switch group corresponding to the blue sub-pixel are connected with a drain of a thin film transistor in the blue sub-pixel.

8. The display apparatus according to claim 7, wherein the signal controller includes six signal outputs including first to sixth signal outputs,

the first and second signal outputs are connected with the control terminals of the first and second switches corresponding to the red sub-pixel respectively;

the third and fourth signal outputs are connected with the control terminals of the first and second switches corresponding to the green sub-pixel respectively; and

the fifth and sixth signal outputs are connected with the control terminals of the first and second switches corresponding to the blue sub-pixel respectively.

9. The display apparatus according to claim 1, wherein the first and second switches are thin film transistors.

10. A method for driving the display apparatus according to claim 1, the method comprising:

charging each pixel unit by the source driving circuit based on the on-off states of the respective switches corresponding to the pixel unit through a plurality of charging phases, wherein

the method further comprising;

controlling one of the switches in the switch group corresponding to one of the sub-pixels to be switched on to transmit a data signal output from the source driving circuit to the one of the sub-pixels to perform a first charging on the one of the sub-pixels in one of the charging phases of each pixel unit; and

controlling another one of the switches in the switch group corresponding to the one of the sub-pixels to be switched on to transmit a data signal output from the source driving circuit to the one of the sub-pixels to perform a second charging on the one of the sub-pixels in at least another one of charging phases of the same pixel unit.

11. The method according to claim 10, further comprising:

performing a primary charging on one of the sub-pixels in each pixel unit while simultaneously performing a pre-charging on at least another one of the sub-pixels in the pixel unit in each charging phase, and

during each charging phase, the source driving circuit outputs a data signal corresponding to the sub-pixel on which the primary charging is being performed.

12. The method according to claim 11, further comprising:

during each charging phase, controlling one of the switches in the switch group corresponding to one of the sub-pixels and one of the switches in the switch group corresponding to another one of the sub-pixels in each pixel unit to be simultaneously switched on.

13. The method according to claim 12, wherein

each of the pixel units is configured to include a red sub-pixel, a green sub-pixel and a blue sub-pixel;

each switch group is configured to include first and second switches;

the method comprising;

during the charging of each pixel unit;

controlling the first switch connected with the red sub-pixel and the second switch connected with the blue sub-pixel to be switched on in a first charging phase;

controlling the second switch connected with the red sub-pixel and the first switch connected with the green sub-pixel to be switched on in a second charging phase; and

controlling the second switch connected with the green sub-pixel and the first switch connected with the blue sub-pixel to be switched on in a third charging phase.

14. The method of claim 10, wherein the respective pixel units are synchronously controlled.