OLED PWM Pixel Driving Method for Luminance Uniformity
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Solution Overview
Problem
Existing OLED pixel driving circuits using digital driving modes experience non-uniform luminance and display errors, such as dark or bright lines, due to limitations in gray level control during Pulse-Width Modulation (PWM) operations.
Innovation Solution
The method involves slicing an image frame into subfields with varying weights, splitting subfields with higher weights into secondary subfields, and rearranging these subfields based on a predetermined splitting ratio and input image requirements to eliminate display errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital driving mode with PWM is used for OLED pixel control, then non-uniform luminance problem is restrained, but gray level display errors occur during frame switching
Solution Approach 1:
The patent divides each frame into multiple subfields with different weights (e.g., 1:2:4:8:16:32), and further segments high-weight subfields into secondary subfields. This segmentation allows for more precise control of gray levels by redistributing subfield weights, eliminating display errors while maintaining luminance uniformity achieved by digital PWM driving.
2Ease of operation
If subfields are arranged in fixed weight order, then driving control is simplified, but image display errors occur during gray level transitions
Solution Approach 1:
The patent dynamically adjusts the arrangement of subfields based on the actual image content and gray level requirements. Instead of a fixed weight order, the system selectively arranges subfields (including splitting high-weight subfields into secondary subfields) to match the input image characteristics, thereby eliminating display errors while maintaining driving control feasibility.
Data Source
AI summary
Disclosed is an OLED PWM pixel driving method. The method comprises: slicing a frame of image into a plurality of subfields different in weight, and splitting a subfield having a higher weight thereamong into secondary subfields in a predetermined splitting ratio; and rearranging the split secondary subfields from the subfield having a higher weight and non-split subfields according to an input image and the predetermined splitting ratio in order to eliminate an image display error.