Array Substrate Data Signal Cancellation Lines for LCD Crosstalk
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Solution Overview
Problem
Liquid Crystal Display (LCD) panels are prone to horizontal crosstalk and uneven brightness due to voltage changes in the data lines, which affect the common electrode and lead to parasitic capacitance.
Innovation Solution
An array substrate is designed with data signal cancellation lines that generate voltage signals opposite in polarity to the data lines, effectively canceling the influence of parasitic capacitance and maintaining stable common electrode voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data lines are used to transmit voltage signals in LCD panels, then data transmission function is achieved, but horizontal crosstalk and brightness unevenness occur due to voltage changes affecting the common electrode
Solution Approach 1:
A cancellation line is introduced as an intermediary element between the data line and the common electrode. This cancellation line carries a voltage signal with opposite polarity to the data line signal, acting as a mediator to counterbalance the parasitic capacitance effect. The cancellation line is positioned closer to the common electrode than the data line, allowing it to effectively compensate for the voltage fluctuations induced by the data line on the common electrode, thereby reducing horizontal crosstalk and brightness unevenness.
2Productivity
If the data line is positioned closer to the common electrode to reduce parasitic capacitance, then signal transmission efficiency improves, but the risk of voltage interference and crosstalk increases
Solution Approach 1:
The cancellation line serves as an intermediary that compensates for the voltage interference caused by positioning the data line closer to the common electrode. By introducing this intermediate element with opposite polarity signal, the system can maintain the beneficial close positioning for signal transmission while actively counteracting the harmful voltage interference through the cancellation line's compensating effect.
Solution Approach 2:
The cancellation line is positioned and configured in advance to preemptively counteract the voltage interference that would otherwise be caused by the data line's proximity to the common electrode. The cancellation line's opposite polarity signal is applied before the interference can significantly affect the common electrode voltage, thereby preventing horizontal crosstalk and brightness unevenness while allowing the data line to maintain its efficient close positioning.
3Reliability
If the width of the gap between data line and cancellation line is reduced to improve signal cancellation effect, then parasitic capacitance compensation improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the width of the gap between the data line and cancellation line should be within a specific range (greater than 0 micrometers and less than or equal to the difference between the common electrode width and the total width of the data signal cancellation line and the data line). This parameter optimization allows the gap to be small enough to provide effective parasitic capacitance compensation while remaining large enough to be manufacturable with standard precision, thus balancing compensation effectiveness with manufacturing feasibility.
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 improves the display panel's performance by reducing horizontal crosstalk and brightness unevenness, ensuring stable image display even with voltage changes in the data lines.
Implementation Method 1
The voltage change on the data line will affect the voltage of the common electrode above the data line. The voltage of the common electrode above the data line increases or decreases sharply, so that the common electrode voltage value on the entire array substrate deviates from the expected normal common electrode voltage value
Implementation Method 2
The working principle of a liquid crystal panel consists in controlling the rotation of the liquid crystal molecules of the liquid crystal layer by applying driving voltages to the pixel electrode and the common electrode, so as to refract the light of the backlight module to generate an image
Data Source
AI summary
An array substrate, a display device, and a driving circuit are disclosed. The array substrate includes a substrate, a pixel electrode layer disposed on the substrate, a first insulating layer disposed on the substrate, multiple data lines disposed on the first insulating layer, a second insulating layer disposed on the first insulating layer and covering the data lines, a common electrode layer disposed on the second insulating layer, and multiple data signal cancellation lines disposed between the common electrode layer and the first insulating layer. The common electrode layer includes multiple common shield electrode layers. The data signal cancellation lines are disposed in one-to-one correspondence with the data lines. Along the direction from the pixel electrode layer toward the common electrode layer, one common shield electrode layer covers one respective data signal cancellation line and one respective data line.