Liquid Crystal Display Electrode Overlap for Kickback Voltage Reduction
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Solution Overview
Problem
As the resolution of liquid crystal displays increases, the overlapping area of the pixel and common electrodes decreases, leading to an increase in kickback voltage, which can cause display quality deterioration such as flicker.
Innovation Solution
The design includes a first substrate with specific electrode configurations, such as a first electrode with a larger opening than the contact hole and a drain electrode with a wider width, allowing the contact portion of the second electrode to overlap the first electrode adjacent to the contact hole, thereby increasing the storage capacitance and reducing the kickback voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the liquid crystal display is increased, then the display quality is improved, but the overlapping area of the pixel electrode and the common electrode is decreased, leading to an increase in kickback voltage
Solution Approach 1:
The patent introduces a vertical stacking dimension by placing the contact portion of the second electrode above the first electrode through multiple insulating layers, creating a three-dimensional overlapping structure. This vertical arrangement increases the storage capacitance without occupying additional horizontal area, thereby resolving the contradiction between high resolution and kickback voltage reduction.
Solution Approach 2:
The patent implements a nested structure where the contact portion of the second electrode is positioned within the projection area of the first electrode, creating a layered nested arrangement. This nesting increases the overlapping area for capacitance storage while maintaining a compact footprint suitable for high-resolution displays.
2Measurement precision
If the overlapping area of the pixel electrode and the common electrode is decreased, then the resolution is increased, but the magnitude of the kickback voltage is increased
Solution Approach 1:
The patent introduces insulating layers as intermediary structures between the first and second electrodes. These insulating layers enable the contact portion of the second electrode to be positioned above the first electrode, creating a mediated connection that increases storage capacitance without requiring horizontal overlapping area, thus reducing kickback voltage while maintaining high resolution.
3Measurement precision
If the magnitude of the kickback voltage is increased, then the resolution is higher, but a flicker is generated that causes deterioration of the display quality
Solution Approach 1:
The patent implements preliminary action by pre-positioning the contact portion of the second electrode to overlap the first electrode through the insulating layers before operation. This pre-arranged overlapping structure ensures sufficient storage capacitance is established in advance, preventing kickback voltage generation and the resulting flicker during display operation, while maintaining high resolution.
Data Source
AI summary
A liquid crystal display including: a first substrate; a gate line and a data line formed or otherwise disposed on the first substrate; a drain electrode disposed on the first substrate; a first insulating layer disposed on the gate line and the data line; a first electrode disposed on the first insulating layer; a second insulating layer disposed on the first electrode; and a second electrode disposed on the second insulating layer. The first insulating layer and the second insulating layer have a first contact hole exposing a portion of the drain electrode. The contact portion of the second electrode is connected to the drain electrode through the first contact hole, and the contact portion overlaps the first electrode adjacent the first contact hole. The overlap increases capacitance of the display panel so as to decrease kickback voltage and reduce flicker.