Pixel driving circuits for switching display resolution, driving methods thereof and display apparatuses

Patent metadata

Field	Value
Publication number	US-10559282-B2
Application number	US-201715793957-A
Country	US
Kind code	B2
Filing date	Oct 25, 2017
Priority date	Mar 29, 2017
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

The present disclosure relates to a pixel driving circuit for switching display resolution, a driving method thereof, and a display apparatus. The pixel driving circuit comprises: r first data lines and k second data lines, each of the first data lines has a first switch provided thereon, and is connected to at least one of the k second data lines through at least one second switch respectively, and the first switch and the second switch are connected to a signal control unit which is configured to control the first switch to be turned on and the second switch to be turned off when display is to be performed at a first resolution, and control the first switch to be turned off and the second switch to be turned on when display is to be performed at a second resolution.

First claim

We claim:

1. A pixel driving circuit, comprising:
N operational amplifiers;
N data lines connected to the N operational amplifiers respectively, the N data lines at least comprising r first data lines and k second data lines, wherein each of the first data lines has a first switch provided thereon, wherein each of the first data lines corresponds to at least one of the k second data lines and is connected to the at least one of the k second data lines through at least one second switch respectively, where r+k≤N, and k=r*q, wherein q is the number of the at least one of the k second data lines, wherein r, k, and q are integers greater than 0;
wherein the first switch and the second switch are connected to a signal control unit respectively, and the signal control unit is configured to control the first switch to be turned on and the second switch to be turned off when display is to be performed at a first resolution, and the signal control unit is further configured to control the first switch to be turned off and the second switch to be turned on when display is to be performed at a second resolution, wherein the first resolution is greater than the second resolution,
wherein the first data lines comprise an ith data line and an (i+1)th data line of the N data lines, and the second data lines comprise a jth data line and a (j+1)th data line of the N data lines, wherein the ith data line is connected to a voltage output terminal of an ith operational amplifier of the N operational amplifiers through the first switch provided on the ith data line, and the (i+1)th data line is connected to a voltage output terminal of an (i+1)th operational amplifier of the N operational amplifiers through the first switch provided on the (i+1)th data line, the jth data line is connected to a voltage output terminal of a jth operational amplifier, and the (j+1)th data line is connected to a voltage output terminal of a (j+1)th operational amplifier, wherein each of the ith data line and the (i+1)th data line is connected to one of the jth data line and (j+1)th data line through a respective second switch; and
wherein the i th operational amplifier has a first power supply input terminal connected to a second power supply input terminal of the (i+1) th operational amplifier and a second power supply input terminal connected to the ground, and the (i+1) th operational amplifier has a first power supply input terminal connected to a power supply and the second power supply input terminal connected to the first power supply input terminal of the i th operational amplifier.

2. The pixel driving circuit according to claim 1 , wherein:
the j th operational amplifier has a first power supply input terminal connected to a second power supply input terminal of the (j+1) th operational amplifier and a second power supply input terminal connected to the ground, and the (j+1) th operational amplifier has a first power supply input terminal connected to a power supply and the second power supply input terminal connected to the first power supply input terminal of the j th operational amplifier;
the signal control unit is configured to output a first level signal when display is to be performed at the first resolution, so that the first level signal controls the first switch to be turned on and the second switch to be turned off; and
the signal control unit is further configured to output a second level signal when display is to be performed at the second resolution, so that the second level signal controls the first switch to be turned off and the second switch to be turned on.

3. The pixel driving circuit according to claim 1 , further comprising a source driver connected to each of the data lines, wherein a 2i th data line and a (2i+1) th data line are connected to the source driver through at least one connection line respectively; and
the source driver is configured to control the 2i th data line to output a display signal when an input voltage is a first voltage signal and control the (2i+1) th data line to output the display signal when the input voltage is a second voltage signal.

4. The pixel driving circuit according to claim 1 , wherein a current first data line is an i th data line, and q second data lines corresponding to the current first data line are a j th data line to a (j+q−1) th data line.

5. The pixel driving circuit according to claim 4 , wherein:
q=1 and j=i+1, and the second data line corresponding to the current first data line is an (i+1) th data line; or
q=1 and j=i+m−1, where m>2, and the second data line corresponding to the current first data line is an (i+m−1) th data line.

6. The pixel driving circuit according to claim 5 , wherein m=4, and in a display apparatus driven by the pixel driving circuit, each pixel unit comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel.

7. The pixel driving circuit according to claim 5 , wherein m=5, and in a display apparatus driven by the pixel driving circuit, each pixel unit comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel.

8. The pixel driving circuit according to claim 4 , wherein:
q≥2 and j=i+1, and the q second data lines corresponding to the current first data line are an (i+1) th data line to an (i+q) th data line; or
q≥2 and j=i+m−1, where m>2, and the q second data lines corresponding to the current first data line are an (i+m−1) th data line to an (i+q+m−2) th data line; or
q≥2 and j=i+m−1 where m>2, and the q second data lines corresponding to the current first data line are an (i+m−1) th data line, an (i+2(m−1)) th data line, an (i+3(m−1)) th data line, . . . , an (i+(q−1) (m−1)) th data line, and an (i+q(m−1)) th data line in turn.

9. The pixel driving circuit according to claim 1 , wherein:
the first power supply input terminal of each of the operational amplifiers connected to the first data lines is further connected to a third switch which is connected to the signal control unit;
the signal control unit is further configured to output a first level signal when display is to be performed at the first resolution so that the first level signal controls the third switch to be turned on; and
the signal control unit is further configured to output a second level signal when display is to be performed at the second resolution so that the second level signal controls the third switch to be turned off.

10. The pixel driving circuit according to claim 9 , wherein:
the first switch is an N-type transistor, the second switch is a P-type transistor, and the third switch is an N-type transistor; or
the first switch is a P-type transistor, the second switch is an N-type transistor, and the third switch is a P-type transistor.

11. A pixel driving method applied to the pixel driving circuit according to claim 1 , comprising:
controlling, by the signal control unit, the first switch to be turned on and the second switch to be turned off when display is to be performed at the first resolution; and
controlling, by the signal control unit, the first switch to be turned off and the second switch to be turned on when display is to be performed at the second resolution.

12. The method according to claim 11 , wherein:
the signal control unit outputs a first level signal when display is to be performed at the first resolution, so that the first level signal controls the first switch to be turned on and the second switch to be turned off; and
the signal control unit outputs a second level signal when display is to be performed at the second resolution, so that the second level signal controls the first switch to be turned off and the second switch to be turned

Assignees

• Boe Technology Group Co Ltd

Inventors

• Shang Guangliang
• Gyu Jung Chul
• Han Seung Woo
• Zheng Haoliang
• Han Mingfu
• Jin Zhihe
• Sik Im- Yun-
• Lv Jing
• Dong Xue

Classifications

• G09G3/3614

  Control of polarity reversal in general · CPC title

• G09G2310/0275

  Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current · CPC title

• G09G3/20 Primary

  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 title

• G09G2310/0291

  Details of output amplifiers or buffers arranged for use in a driving circuit · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title