Display Panel Reference Line Load Control for Faster Subpixel Sensing
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Solution Overview
Problem
Display devices, particularly organic light emitting display devices, face challenges with increased sensing and compensation times for subpixel characteristic values as resolution increases, leading to non-uniform luminance between subpixels.
Innovation Solution
A display device and panel structure that reduces sensing time by incorporating a load control transistor between sensing transistors and a reference voltage line, thereby minimizing the load on the reference voltage line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of display devices is increased, then the image quality is improved, but the sensing time and compensation time for subpixel characteristic values increase
Solution Approach 1:
The display panel is divided into multiple pixel groups, where each pixel group shares a common reference voltage line. This segmentation allows the sensing operation to be performed on smaller groups simultaneously, reducing the total sensing time while maintaining measurement precision for each subpixel's characteristic values
Solution Approach 2:
A load control transistor is introduced to pre-control the connection between sensing transistors and the reference voltage line. This preliminary action ensures that the reference voltage line is ready and stabilized before sensing operations begin, preventing delays during the actual sensing process and reducing overall sensing time
2Reliability
If real-time sensing of driving transistor characteristic values is performed, then luminance uniformity between subpixels is improved, but the sensing time increases
Solution Approach 1:
The sensing operation is performed periodically during blank periods in the image driving cycle. By utilizing these idle time intervals, the system can conduct real-time sensing of driving transistor characteristic values without extending the overall display refresh time, thus maintaining luminance uniformity while minimizing sensing time impact
Solution Approach 2:
The load control transistor acts as an intermediary between the sensing transistors and the reference voltage line. It controls the timing and duration of the connection, enabling efficient sensing operations that maintain luminance uniformity while reducing the time required for each sensing cycle
Data Source
AI summary
A display panel and a display device including the display panel are discussed. The display device in some examples can include a light emitting element included in each of a plurality of subpixels, a subpixel circuit configured to drive the light emitting element, a reference voltage line connected to a pixel group including a plurality of subpixel circuits, and a load control transistor electrically connecting the pixel group and the reference voltage line during a period in which a gate signal is applied to the pixel group.