Array Substrate Layout for Display Flicker Reduction
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Solution Overview
Problem
Display panels experience image flicker due to capacitive coupling effects caused by light-shielding layers overlapping with active layers, leading to fluctuations in pixel voltage and brightness.
Innovation Solution
An array substrate design with alternating first-type and second-type data lines and sub-pixels, where light-shielding layers corresponding to first sub-pixels are electrically connected to those of second sub-pixels through connecting lines, opposing capacitive coupling directions and reducing voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer is added between the active layer and base substrate to reduce photo-generated leakage current, then light shielding performance is improved, but capacitive coupling between the light-shielding layer and active layer causes pixel voltage fluctuations and image flicker
Solution Approach 1:
An insulating layer is introduced between the light-shielding layer and the active layer to act as an intermediary. This insulating layer prevents direct capacitive coupling while allowing the light-shielding layer to continue blocking light from reaching the active layer, thus eliminating pixel voltage fluctuations caused by capacitive coupling without compromising light shielding performance.
2Illumination intensity
If the light-shielding layer and active layer overlap to provide light shielding, then light shielding effectiveness is improved, but capacitive coupling affects stored charges and causes brightness fluctuations
Solution Approach 1:
The insulating layer serves as a mediator that maintains the overlapping configuration of the light-shielding layer and active layer for effective light blocking, while simultaneously preventing capacitive coupling that would otherwise cause brightness fluctuations and image flicker.
3Reliability
If data voltages with opposite polarities are applied to first-type and second-type data lines, then capacitive coupling effects are reduced, but device complexity increases due to alternating data line configuration
Solution Approach 1:
The data line configuration is segmented into first-type and second-type data lines with alternating polarities. This segmentation allows the application of opposite polarity voltages to adjacent data lines, creating opposing capacitive coupling effects that reduce overall coupling impact on pixel voltage stability, while maintaining a manageable alternating pattern.
Solution Approach 2:
Instead of applying the same polarity to all data lines, the invention inverts the polarity alternation between adjacent first-type and second-type data lines. This inversion strategy creates opposing capacitive coupling fields that cancel each other out, reducing net capacitive coupling effects on the pixel circuitry.
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
Effectively reduces pixel brightness changes caused by capacitive coupling, thereby alleviating image flicker issues in display panels.
Implementation Method 1
a light-shielding layer is usually added between a channel region of an active layer and a base substrate of a thin film transistor (TFT) of a display panel, and the light-shielding layer can shield light directed to the active layer
Implementation Method 2
the light-shielding layer and the active layer overlap each other to generate capacitance, and when the display panel is working, a source electrical signal changes, such that a capacitive coupling effect affects stored charges of pixels
Data Source
AI summary
The present application provides an array substrate, a display panel, and a display device. In the present application, a plurality of first-type data lines and a plurality of second-type data lines with data voltages of opposite polarities are provided, and a light-shielding layer of each of first sub-pixels is at least electrically connected to a light-shielding layer of one of second sub-pixels through a connecting line, which can effectively reduce a change in pixel brightness caused by capacitive coupling, and relieve a problem of image flicker.