Method for driving active matrix organic light emitting diode display panel

• US 8,605,127 B2
• Filed: 02/07/2011
• Issued: 12/10/2013
• Est. Priority Date: 10/27/2010
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Yang, Hsueh-Yen, Tsai, Tze-Chien
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Khoo, Stacy
• Application Number:
  US13/022,591
• Publication Number:
  US 20120105517A1
• Time in Patent Office: 1,037 Days
• Field of Search: 345/76, 345/77, 345/84, 345/690, 345/694
• US Class Current: 345/694
• 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 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

A method for driving an active matrix organic light emitting diode (AMOLED) display panel is provided. In the present method, how to drive a single pixel having a red sub-pixel, a green sub-pixel, a first blue (light blue) sub-pixel, and a second blue (dark blue) sub-pixel is effectively determined based on the characteristics of the (1931) CIE color space. Besides, at the same time point, only one of the two sub-pixels corresponding to the two blues (i.e. dark blue and light blue) in the single pixel is enabled to be mixed with the red sub-pixel and the green sub-pixel. Accordingly, the luminous efficiency of the AMOLED is improved and the power consumption of the entire AMOLED display is reduced.

Claims

1. A method for driving an active matrix organic light emitting diode (AMOLED) display panel, wherein the AMOLED display panel has at least one pixel, and the pixel has a red sub-pixel, a green sub-pixel, a first blue sub-pixel, and a second blue sub-pixel, the method comprising:

determining which one of the first blue sub-pixel and the second blue sub-pixel is enabled according to an inputted 3-dimensional (3D) color signal; and

when the first blue sub-pixel is to be enabled, converting a color ratio of the 3D color signal to obtain a set of corrected driving signals for driving the red sub-pixel, the green sub-pixel and the first blue sub-pixel, and disabling the second blue sub-pixel,

wherein the step of determining which one of the first blue sub-pixel and the second blue sub-pixel is enabled comprises;

capturing an original green component and an original second blue component from the 3D color signal;

multiplying the original second blue component by a calculation value to obtain a comparative green component; and

comparing the original green component with the comparative green component to determine which one of the first blue sub-pixel and the second blue sub-pixel is enabled.

2. The method according to claim 1 further comprising:

when the second blue sub-pixel is to be enabled, retaining the color ratio of the 3D color signal to obtain a set of original driving signals for driving the red sub-pixel, the green sub-pixel and the second blue sub-pixel, and disabling the first blue sub-pixel.

3. The method according to claim 2, wherein

the set of corrected driving signals comprise a red component, a green component and a first blue component for respectively driving the red sub-pixel, the green sub-pixel, and the first blue sub-pixel;

and

the set of original driving signals comprise a red component, a green component, and a second blue component for respectively driving the red sub-pixel, the green sub-pixel and the second blue sub-pixel.

4. The method according to claim 1, wherein

when the original green component is greater than or equal to the comparative green component, the first blue sub-pixel is enabled;

and

when the original green component is smaller than the comparative green component, the second blue sub-pixel is enabled.

5. The method according to claim 1, wherein

the red sub-pixel, the green sub-pixel, and the second blue sub-pixel form a first color gamut in a Commission Internationale de l'"'"'Eclairage (CIE) color space;

the red sub-pixel, the green sub-pixel, and the first blue sub-pixel form a second color gamut in the CIE color space, wherein the second color gamut is different from the first color gamut; and

a line segment between a green vertex and a second blue vertex of the first color gamut and a line segment between a red vertex and a first blue vertex of the second color gamut have an intersection point, and the calculation value is a ratio of second blue to green on a line segment from the intersection point to the red vertex of the first color gamut and the second color gamut.

6. The method according to claim 5, wherein the step of converting the color ratio of the 3D color signal comprises:

integrating a CIE transformation matrix corresponding to the red sub-pixel, the green sub-pixel and the first blue sub-pixel and a CIE transformation matrix corresponding to the red sub-pixel, the green sub-pixel, and the second blue sub-pixel into a single transformation matrix based on a fact that the first color gamut and the second color gamut have same CIE coordinates; and

bringing a red component, a green component, and a second blue component in the 3D color signal into the single transformation matrix to convert the color ratio of the 3D color signal, so as to obtain the set of corrected driving signals.

7. The method according to claim 1, wherein the first blue sub-pixel is a light blue sub-pixel, and the second blue sub-pixel is a dark blue sub-pixel.