Display Test Circuit for Sampling Clock Phase Calibration
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Solution Overview
Problem
The varying lengths of connection circuit boards in display devices across different application scenarios require different sampling clock phases, leading to poor applicability and increased complexity in secondary development due to the need for re-writing programs in the timing controller.
Innovation Solution
A display device with a test circuit featuring two first test lines extending in a first direction, connected to a second control assembly that determines the length of the connection circuit board and adjusts the sampling clock phase accordingly, allowing for universal applicability across different board lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the connection circuit board length is varied for different application scenarios, then the display device can adapt to different applications, but the sampling clock phase requires re-writing in the timing controller, resulting in poor applicability
Solution Approach 1:
The timing controller automatically measures the connection circuit board length using test lines and calculates the required sampling clock phase without external intervention. The system self-configures by having the timing controller send a test signal through the connection circuit board, measure the transmission time, and automatically determine the optimal phase, eliminating the need for manual program re-writing.
Solution Approach 2:
The patent changes the measurable parameter from fixed program configuration to dynamic physical measurement. By measuring the actual transmission time of test signals through the connection circuit board and converting this physical measurement into phase configuration parameters, the system adapts to different board lengths without requiring program modifications.
2Manufacturing precision
If different sampling clock phases are written for different board lengths, then accurate signal sampling is achieved, but manufacturing cost and development time increase due to frequent program re-writing
Solution Approach 1:
The patent replaces the mechanical/software process of manually writing different clock phases with an automated electrical measurement and calculation process. The timing controller uses test signal transmission and time measurement to automatically determine the optimal phase, substituting manual programming with automated electronic measurement and computation.
Solution Approach 2:
The system performs preliminary measurement of the connection circuit board length before actual operation. By measuring the board length in advance using test lines and calculating the required phase beforehand, the system prepares the optimal configuration automatically, eliminating the need for trial-and-error programming during manufacturing or deployment.
Data Source
AI summary
Provided is a display device. A test circuit is provided in the display device, and the test circuit includes two first test lines extending in a first direction, the two ends of the first test line are disposed on the connection circuit board proximate to the first control assembly and proximate to the second control assembly, respectively, and the two first test lines are electrically connected to the second control assembly, so that the second control assembly transmits a test signal to one test line and receives the test signal from the other test line, determines the length of the connection circuit board based on the transmitting moment and the receiving moment of the test signal, and further determines the phase of the sampling clock based on the length of the connection circuit board.