PIXEL ARRAY OF ACTIVE MATRIX ORGANIC LIGHTING EMITTING DIODE DISPLAY, METHOD OF DRIVING THE SAME, AND METHOD OF DRIVING DUAL PIXEL OF ACTIVE MATRIX ORGANIC LIGHTING EMITTING DIODE DISPLAY

• US 20170053589A1
• Filed: 08/20/2015
• Published: 02/23/2017
• Est. Priority Date: 08/20/2015
• Status: Active Grant

• Current Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Original Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Inventors: Huang, Chin-Hai, Huang, Yen-Yu, Tsai, Chi-Chung, Huang, Szu-Chi
• Granted Patent: US 9,761,171 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 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

A pixel array includes a plurality of pixels. Each pixel has a first sub-pixel, a second sub-pixel, and a pair of third sub-pixels. The first sub-pixel of each pixel and the first sub-pixels of three adjacent pixels are arranged in a two by two array, the second sub-pixel of each pixel and the second sub-pixels of three adjacent pixels are arranged in a two by two array, and one of each of the third sub-pixels of each pixel and one of the third sub-pixels of three adjacent pixels are arranged in a two by two array. A scan line is connected to a switch unit of each of the sub-pixels in a pixel.

Claims

1. A pixel array of an active matrix organic light emitting diode (OLED) display, comprising:

a plurality of pixels arranged in an array, each pixel being electrically connected with a scan line, a first data line, a second data line, a third data line between the first data line and the second data line, and a power source, the scan line being intersected with the first data line, the second data line and the third data line, each pixel comprising a first sub-pixel, a second sub-pixel and a pair of third sub-pixels, a first OLED of the first sub-pixel being electrically connected to the scan line, the first data line and the power source through a first driving circuit of the first sub-pixel, a second OLED of the second sub-pixel being electrically connected to the scan line, the second data line and the power source through a second driving circuit of the second sub-pixel, and a third OLED of each third sub-pixel being electrically connected to the scan line, the third data line and the power source through a third driving circuit of the corresponding third sub-pixel,

wherein the first sub-pixel, the second sub-pixel, and the third sub-pixels in each pixel are arranged in a two by two array, the pair of third sub-pixels are arranged diagonally to each other, and the first sub-pixel and the second sub-pixel are arranged diagonally to each other;

wherein the first sub-pixel of each pixel and the first sub-pixels of three adjacent pixels are arranged in a two by two array, the second sub-pixel of each pixel and the second sub-pixels of three adjacent pixels are arranged in a two by two array, and one of the third sub-pixels of each pixel and one of the third sub-pixels of three adjacent pixels are arranged in a two by two array.

2. The pixel array as claimed in claim 1, wherein the first OLED emits a green light.

3. The pixel array as claimed in claim 1, wherein the second OLED emits a red light.

4. The pixel array as claimed in claim 1, wherein the third OLED emits a blue light.

5. The pixel array as claimed in claim 1, wherein each of the first driving circuit, the second driving circuit, and the third driving circuit comprises a switch unit, a driving unit, and at least one capacitor electrically connected between the switch unit and the driving unit.

6. A method of driving each of the pixels in the pixel array of claim 1, the method comprising:

writing data respectively to the first sub-pixel from the first data line, the second sub-pixel from the second data line, and the third sub-pixels from the third data line when an enabling signal is applied to the scan line.

7. A pixel array of an active matrix organic light emitting diode (OLED) display comprising:

a plurality of pixels arranged in an array, each pixel being electrically connected with a scan line, a first data line, a second data line, a third data line between the first data line and the second data line, and two power lines, the scan line being intersected with the first data line, the second data line and the third data line, wherein the power lines and the first data line, the second data line and the third data line are parallel and alternately arranged, each pixel comprising;

a first sub-pixel, a second sub-pixel, and a pair of third sub-pixels,

wherein the scan line is connected to a switch unit of each of the sub-pixels, the switch unit of the first sub-pixel is connected to the first data line, the switch unit of the second sub-pixel is connected to the second data line, and the switch units of the pair of third sub-pixels are connected to the third data line, and each power line is connected to a driving unit of each of two sub-pixels in a same column of each pixel, and an OLED of each of the sub-pixels is electrically connected to the driving unit of each of the sub-pixels,

wherein the first sub-pixel, the second sub-pixel, and the third sub-pixels in each pixel are arranged in a two by two array, the pair of third sub-pixels are arranged diagonally to each other, and the first sub-pixel and the second sub-pixel are arranged diagonally to each other,

wherein the first sub-pixel of each pixel and the first sub-pixels of the three adjacent pixels are arranged in a two by two array, the second sub-pixel of each pixel and the second sub-pixels of the three adjacent pixels are arranged in a two by two array, and one of the third sub-pixels of each pixel and one of the third sub-pixels of the three adjacent pixels are arranged in a two by two array.

8. The pixel array as claimed in claim 7, wherein the OLED of the first sub-pixel emits a green light.

9. The pixel array as claimed in claim 7, wherein the OLED of the second sub-pixel emits a red light.

10. The pixel array as claimed in claim 7, wherein the OLED of the third sub-pixel emits a blue light.

11. The pixel array as claimed in claim 7, wherein each pixel further comprises a capacitor electrically connected between the switch unit and the driving unit.

12. A method of driving each of the pixels in the pixel array of claim 7, the method comprising:

writing data respectively to the first sub-pixel from the first data line, the second sub-pixel from the second data line, and the third sub-pixels from the third data line when an enabling signal is applied to the scan line.

13. A method of driving a dual pixel of an active matrix organic light emitting diode (OLED) display, wherein the dual pixel comprises a first sub-pixel, a second sub-pixel, and a pair of third sub-pixels arranged in a two by two array, wherein the dual pixel is electrically connected to a first scan line, a second scan line, a first data line, and a second data line, wherein the dual pixel serves as two pixels, and each pixel comprises the first sub-pixel, the second sub-pixel, and one of the third sub-pixels, and the first sub-pixel and the second sub-pixel are shared between the two pixels, the method comprising:

writing data respectively to the first sub-pixel in a first row of the dual pixel through the first data line and one of the third sub-pixels in the first row through the second data line when an enabling signal is applied to the first scan line; and

writing data respectively to the other one of the third sub-pixels in a second row of the dual pixel through the first data line and the second sub-pixel in the second row through the second data line when an enabling signal is applied to the second scan line, wherein when data is written into the first sub-pixel and the second sub-pixel, the first sub-pixel and the second sub-pixel act as sub-pixels for two independent pixels.