Display Panel Sub-Pixel Driving Circuit Uniform Brightness
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Solution Overview
Problem
Existing display panels face issues with sub-pixel driving circuits treating a row of sub-pixels as dark lines during threshold voltage detection, affecting display performance and increasing complexity due to the need for separate low-voltage signal traces for each sub-pixel.
Innovation Solution
The introduction of a sub-pixel driving circuit with a first and second light emitting control unit, connected in a specific configuration to prevent abnormal light emission and eliminate the need for separate low-voltage signal traces, allowing parallel connection with adjacent rows for uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate low-voltage signal traces are configured for each sub-pixel during threshold voltage detection, then threshold voltage compensation can be performed, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the low-voltage signal traces by connecting sub-pixels in the same column across different rows in parallel. Instead of providing separate traces for each sub-pixel, the invention combines multiple sub-pixel circuits into parallel groups that share common signal traces, thereby reducing circuit complexity while maintaining threshold voltage detection capability
Solution Approach 2:
The patent makes the data signal line serve multiple functions: it acts as both a data signal transmission line and a low-voltage signal trace for threshold voltage detection. By detecting the voltage at the second node during specific time periods, the existing data signal line structure is utilized for dual purposes, eliminating the need for additional dedicated low-voltage traces
2Reliability
If separate low-voltage signal traces are configured for each sub-pixel, then threshold voltage detection is enabled, but manufacturing difficulty increases
Solution Approach 1:
The patent merges the low-voltage signal traces by connecting sub-pixels in the same column across different rows in parallel. Instead of providing separate traces for each sub-pixel, the invention combines multiple sub-pixel circuits into parallel groups that share common signal traces, thereby reducing circuit complexity while maintaining threshold voltage detection capability
Solution Approach 2:
The patent makes the data signal line serve multiple functions: it acts as both a data signal transmission line and a low-voltage signal trace for threshold voltage detection. By detecting the voltage at the second node during specific time periods, the existing data signal line structure is utilized for dual purposes, eliminating the need for additional dedicated low-voltage traces
3Measurement precision
If threshold voltage detection is performed by raising the power low-voltage signal voltage, then detection is enabled, but the organic light emitting diode cathode potential becomes higher than anode, preventing light emission and creating dark lines
Solution Approach 1:
The patent segments the detection process from the light emission process by introducing a specific detection time period during which threshold voltage detection is performed. During this segmented time window, the power low-voltage signal voltage is raised for detection purposes, while during other time periods, normal light emission operations are maintained, thus separating the conflicting functions in time
Solution Approach 2:
The patent implements periodic action by performing threshold voltage detection at specific time periods rather than continuously. The detection operation is activated periodically during the detection time period, allowing the system to switch between detection mode (with raised voltage) and normal emission mode (with normal voltage), thereby resolving the conflict between detection accuracy and light emission
Data Source
AI summary
A display panel and a display terminal are provided. The display panel includes a base substrate and a plurality of sub-pixels. The sub-pixels include a sub-pixel driving circuit and a light emitting device. The sub-pixel driving circuit includes a detection unit, a first light emitting control unit, and a second light emitting control unit. By detecting a potential of a second node, the light emitting device does not emit light abnormally, there is no need to perform dark line processing on the sub-pixels in a current row, and influence of dark lines is eliminated.