Display Substrate Current and Duration Control Circuit Crosstalk
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Solution Overview
Problem
Existing display technologies face challenges in accurately displaying low gray scales due to issues with luminance uniformity and signal crosstalk between data lines, particularly in the column direction, which affect the display's overall performance.
Innovation Solution
The display substrate incorporates a current control circuit and a duration control circuit connected to the same data line, allowing for separate timing of signal writing and duration control, thereby reducing signal crosstalk and improving luminance uniformity by adjusting current amplitude and duration of the driving signal independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate data lines are used for current control and duration control, then signal crosstalk is reduced, but the number of data lines increases and space utilization deteriorates
Solution Approach 1:
The patent combines the current control circuit and duration control circuit to share a common data line, reducing the total number of data lines required. The circuits are designed to operate sequentially on the shared data line, with the current control circuit processing current amplitude information and the duration control circuit processing duration information at different time periods, thereby achieving space optimization while maintaining signal integrity.
Solution Approach 2:
The patent implements dynamic time-division multiplexing where the data line is dynamically allocated to different control circuits at different time periods. The selection circuit switches between connecting the data line to the current control circuit or the duration control circuit based on the operational phase, enabling efficient resource utilization and reducing signal crosstalk through temporal separation.
2Productivity
If data signals are written to current control circuit and duration control circuit at the same time, then processing efficiency is improved, but signal crosstalk increases and luminance uniformity deteriorates
Solution Approach 1:
The patent implements periodic action by dividing the data writing process into distinct time periods. The current control circuit receives and processes data signals during one time period, while the duration control circuit receives and processes data signals during a different time period. This periodic, sequential access eliminates signal crosstalk and ensures luminance uniformity while maintaining overall processing efficiency through structured time-division multiplexing.
3Measurement precision
If current amplitude and duration are controlled independently, then luminance precision is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the pixel driving circuit into distinct functional modules: a current control circuit for precise current amplitude control, a duration control circuit for precise duration control, and a selection circuit for time-division multiplexing. This segmentation enables independent control of current amplitude and duration to achieve precise luminance control, while the modular design helps manage circuit complexity through clear functional separation and reuse of shared components.
Data Source
AI summary
A display substrate includes a plurality of data lines extending in a first direction, and a plurality of sub-pixels. A sub-pixel includes a pixel driving circuit and a light-emitting device. The pixel driving circuit includes a current control circuit, and a duration control circuit electrically connected to the current control circuit and the light-emitting device. The current control circuit is configured to generate a driving signal to drive the light-emitting device to emit light; and the duration control circuit is configured to generate a duration control signal to control a duration of a connection between the current control circuit and the light-emitting device. The current control circuit and the duration control circuit are electrically connected to a same data line.