Liquid Crystal Display Noise Suppression via Settling Adjustment
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Solution Overview
Problem
Liquid crystal display devices with touch panels suffer from malfunctions due to electromagnetic interference (EMI) noises generated by abrupt changes in signal lines, counter electrode voltages, and analog pixel voltages, which existing noise suppression methods, such as using a shield plate, fail to effectively address, leading to inadequate light transmission and increased costs.
Innovation Solution
A noise suppression circuit is implemented in the liquid crystal display device, including a pixel array substrate, a counter substrate, signal and scan drivers, switching transistors, a liquid crystal layer, and voltage generation circuits, with settling adjustment circuits to manage the settling time of voltages, preventing abrupt changes and thus suppressing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield plate is used to shield noises between the liquid crystal display panel and the touch panel, then noise suppression is improved, but light transmission becomes insufficient and the panel becomes dark
Solution Approach 1:
The patent extracts the noise shielding function from a separate physical shield plate and integrates it into the existing liquid crystal display structure by using the liquid crystal layer itself as the shielding medium. This eliminates the need for additional thick shield plates that would block light, while still providing effective noise suppression through the liquid crystal's electromagnetic properties.
Solution Approach 2:
The liquid crystal layer is given multiple functions: it serves both as the display medium and as the electromagnetic shield. By making the liquid crystal layer perform dual roles, the patent avoids adding separate shielding components that would compromise light transmission, thereby resolving the contradiction between noise suppression and illumination intensity.
2Object-affected harmful factors
If a shield plate is used to shield noises, then noise suppression is improved, but manufacturing processes become complicated and cost increases
Solution Approach 1:
The patent merges the shielding function with the existing liquid crystal display structure, combining multiple functions into a single integrated system. This eliminates the need for separate shield plates and complex assembly processes, thereby reducing manufacturing complexity and cost while maintaining noise suppression effectiveness.
Solution Approach 2:
The liquid crystal layer provides its own shielding function without requiring external shield plates or additional components. The liquid crystal material itself serves as the shielding medium, making the system self-sufficient and simplifying both the device structure and manufacturing processes.
3Object-affected harmful factors
If the shield plate becomes thicker to achieve sufficient shielding effect, then noise suppression is improved, but light transmission becomes insufficient
Solution Approach 1:
The patent changes the fundamental parameter of the shielding medium from a solid metallic shield plate to a liquid crystal material. This parameter change allows the shielding function to be achieved with minimal thickness, as the liquid crystal's electromagnetic properties provide effective shielding without requiring the substantial thickness needed for metallic plates, thereby maintaining light transmission.
Data Source
AI summary
A liquid crystal display device includes a pixel array substrate having signal lines and scan lines arranged in a matrix, and pixel circuits arranged at intersections of the signal and scan lines. A touch panel is attached on the counter substrate to draw pictures or characters on a display panel. A first voltage generation circuit generates an analog pixel voltage applied to the signal lines and a second voltage generation circuit generates a counter electrode voltage applied to the counter electrode. A settling adjustment circuit adjusts a settling time of at least one of the analog pixel voltage and the counter electrode voltage.