Display Driving Circuit Impedance Equalization
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Solution Overview
Problem
In liquid crystal display panels, mismatched in-plane impedance in the fan-out region leads to uneven darkness and brightness, affecting display quality and user experience.
Innovation Solution
A display driving circuit with adjustable equalizing resistors connected between the control board and display chips to match impedance, ensuring consistent signal transmission to fan-out routes and pixel units, preventing color and brightness unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If fan-out routes are used to connect control board to display chips, then signal distribution capability is improved, but in-plane impedance mismatch occurs causing brightness and darkness unevenness
Solution Approach 1:
The patent introduces equalizing resistors as intermediary components connected between the control board and display chips through the fan-out routes. These resistors act as mediators to balance the impedance across different signal paths, compensating for the impedance mismatch caused by varying route lengths and processes, thereby preventing brightness and darkness unevenness while maintaining the fan-out signal distribution architecture
Solution Approach 2:
The patent modifies the electrical parameters of the fan-out routes by adding equalizing resistors with specific resistance values. This changes the impedance characteristics of the signal transmission paths, allowing adjustment and matching of in-plane impedance to eliminate display uniformity issues caused by route length and process variations
2Manufacturing precision
If equalizing resistors are added to match impedance, then display uniformity is improved, but circuit complexity increases
Solution Approach 1:
The patent merges the equalizing resistors into the existing fan-out route architecture, integrating them as part of the signal transmission path between the control board and display chips. This combining approach allows impedance equalization to be achieved without creating entirely separate circuit structures, thus improving display uniformity while limiting the increase in overall circuit complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents color and brightness unevenness, enhancing display quality by matching impedance, and allows for adjustable resistance values to accommodate varying panel dimensions and manufacturing processes.
Implementation Method 1
the plurality of equalizing resistors are used to equalize an impedance the display driving circuit; to match the impedance of the plurality of fan-out routes
Data Source
AI summary
A display driving circuit and a liquid crystal display panel are provided. The display driving circuit includes: a control board used to provide a control signal; a plurality of display chips electrically connected to the control board and providing a driving signal according to the control signal; a plurality of equalizing resistors corresponding to the display chips, wherein an end of the equalizing resistors is connected to the control board, and other end of the equalizing resistors is connected to the display chips, and they are used to equalize an impedance the display driving circuit; a plurality of fan-out routes, wherein each of the fan-out routes is connected to the two adjacent display chips; and a pixel bus connected to the plurality of fan-out routes and used to transmit the driving signal to each of pixel units. The present disclosure effectively improves display effect by that mentioned above.