Display Panel Detection Circuit for Multi-Color Screen Testing
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Solution Overview
Problem
Existing detection circuits for display panels are complex and occupy a large frame size, limiting their ability to test multiple display screens effectively, especially for grayscale or mixed color screens, and cannot detect defects in time.
Innovation Solution
A detection circuit comprising four sub-circuits connected to red, green, blue, and preset sub-pixels, allowing for simultaneous signal output to illuminate sub-pixels of different colors, enabling the detection of monochrome, mixed color, and white screens by controlling scanning and data signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a detection circuit is designed to test multiple display screens with complex structure, then the detection capability is improved, but the frame size and device complexity increase
Solution Approach 1:
The detection circuit uses a unified transistor structure that can detect multiple color screens (red, green, blue, yellow, cyan, magenta, white, and grayscale) through different scanning and data signal combinations. The same basic circuit topology serves multiple detection purposes, eliminating the need for separate detection circuits for each screen type.
Solution Approach 2:
The detection circuit is divided into four independent detection sub-circuits, each responsible for detecting one of the four color screens (red, green, blue, yellow). Each sub-circuit includes transistors connected to specific data signal lines and scanning signal lines, allowing parallel or sequential operation to detect different screen types without interfering with each other.
2Adaptability or versatility
If a detection circuit is designed to test multiple display screens with complex structure, then the detection capability is improved, but the frame size increases
Solution Approach 1:
The detection circuit uses a unified transistor structure that can detect multiple color screens (red, green, blue, yellow, cyan, magenta, white, and grayscale) through different scanning and data signal combinations. The same basic circuit topology serves multiple detection purposes, eliminating the need for separate detection circuits for each screen type.
Solution Approach 2:
The detection circuit merges multiple detection functions into a single integrated structure. The four detection sub-circuits share common elements such as the data signal lines (first data signal line, second data signal line) and scanning signal lines (first scanning signal line, second scanning signal line), combining their functions to reduce the overall frame size while maintaining comprehensive detection capability.
3Reliability
If existing detection circuits are used, then the display panel can be tested, but defects cannot be detected timely and waste increases
Solution Approach 1:
The detection circuit performs preliminary detection of display defects before the binding of chips and flexible circuits. By conducting the detection at this early stage in the manufacturing process, the circuit enables timely identification of defects, allowing problematic products to be sorted out before further processing and assembly, thereby reducing waste and improving detection timing.
Data Source
AI summary
A detection circuit includes: a first detection sub-circuit for outputting a first data signal to red sub-pixels under the control of a first scanning signal; a second detection sub-circuit for outputting the first data signal to green sub-pixels under the control of a second scanning signal; a third detection sub-circuit for outputting a second data signal to blue sub-pixels under the control of the second scanning signal; and a fourth detection sub-circuit for outputting the second data signal to preset sub-pixels under the control of the first scanning signal; wherein the preset sub-pixels are any one of red sub-pixels, green sub-pixels and blue sub-pixels.