Display Panel Light-Absorbing Layer for Ambient-Light Channel Protection
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Solution Overview
Problem
Ambient light reflection by metal layers in metal oxide thin film transistor display panels degrades the channel region performance.
Innovation Solution
Incorporation of a light-absorbing layer that covers the gap between electrodes to absorb ambient light, combined with an anti-reflection layer to reduce light reflection on the gate, protecting the channel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal light-shielding layer and gate are used in metal oxide thin film transistor display panels, then high field-effect mobility and simple preparation process are achieved, but ambient light reflection causes channel region performance degradation
Solution Approach 1:
A light-absorbing layer is introduced as an intermediary component between the metal light-shielding layer/gate and the channel region. This layer absorbs ambient light before it can reach and reflect off the metal structures, thereby preventing the harmful reflection that degrades channel region performance while maintaining the electrical functionality of the metal gate and source/drain electrodes.
Solution Approach 2:
The invention converts the harmful effect of ambient light reflection into a beneficial outcome by using the light-absorbing layer to deliberately absorb the ambient light. Instead of allowing the light to reflect off metal structures and damage the channel region, the light-absorbing layer captures the light energy, transforming the harmful reflection pathway into a controlled absorption process that protects the transistor.
2Speed
If metal oxide semiconductor material is used for the active layer, then high field-effect mobility (≥10cm2/V·s) and fast response times are achieved, but the channel region is vulnerable to ambient light influence
Solution Approach 1:
The light-absorbing layer serves as a protective intermediary positioned between the ambient light environment and the metal oxide semiconductor channel region. It absorbs incident light before it can interact with the photo-sensitive semiconductor material, thereby protecting the channel region from performance degradation while allowing the metal oxide TFT to maintain its high-speed response characteristics.
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
Significantly reduces performance degradation of the channel region by absorbing and reflecting ambient light, maintaining transistor stability.
Implementation Method 1
a light-absorbing layer, wherein a vertical projection of the light-absorbing layer on the base substrate covers a vertical projection of a gap between the first electrode and the second electrode on the base substrate
Implementation Method 2
combined with an anti-reflection layer to reduce light reflection on the gate, protecting the channel region
Data Source
AI summary
A display panel and a manufacturing method thereof are provided, where a projection of a light-absorbing layer in the display panel on a base substrate covers a projection of a gap between a first electrode and a second electrode on the base substrate, so as to absorb ambient light directly or indirectly irradiated on a channel region through the gap between a first electrode and a second electrode, so that the channel region on a first metal layer is well protected, which greatly reduces the problem of performance degradation of the channel region of an active layer caused by irradiation of the external ambient light.