Display Panel Pad Contact Testing via Driving Circuit Feedback
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Solution Overview
Problem
Existing display devices face challenges in ensuring stable contact between panel pads and connection board pads, leading to signal distortion issues during the transmission of control and image signals.
Innovation Solution
A display device with a driving circuit connected to both panel and connection board pads, generating test result signals based on differences between transmitted and feedback signals to assess and stabilize the contact state, ensuring fully stable coupling for error-free signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pads of the connection board are coupled to pads of the display panel, then signal transmission is enabled, but contact stability may be insufficient leading to signal distortion
Solution Approach 1:
The patent applies preliminary action by performing pad contact testing before actual signal transmission. The driving circuit tests each pad contact by transmitting test signals and comparing feedback signals to determine contact stability in advance, preventing signal distortion during normal operation.
Solution Approach 2:
The patent implements feedback by transmitting test signals through the pad contacts and receiving feedback signals back through the same contacts. The driving circuit compares the original test signals with the returned feedback signals to evaluate contact stability, ensuring reliable connections before data transmission.
2Reliability
If a driving circuit is added to test pad contact states, then contact stability is improved, but device complexity increases
Solution Approach 1:
The driving circuit performs multiple functions: it drives the display panel during normal operation and simultaneously tests pad contact stability by transmitting and receiving test signals. This multi-functionality reduces the need for separate testing equipment, maintaining reliability while limiting complexity increase.
Solution Approach 2:
The patent merges the signal transmission function and contact testing function into a single integrated process. The same driving circuit, signal lines, and pad contacts used for data transmission are also used for contact testing, combining multiple functions into unified hardware and操作流程.
Data Source
AI summary
A display device includes a display panel including first to fourth panel pads and a connection board including first to fourth connection board pads coupled to the first to fourth pads, respectively. The first and second panel pads are electrically connected to each other, and the third and fourth panel pads are electrically connected to each other. The connection board includes a driving circuit which generates a first test result signal based on a first panel test signal transmitted to the first connection board pad and a first panel feedback signal received from the second connection board pad, generates a second test result signal based on a second panel test signal transmitted to the third connection board pad and a second panel feedback signal received from the fourth connection board pad, and sequentially outputs the first and second test result signals as a test result signal.