Light Shielding Portion for Display Device Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices using polymer dispersed liquid crystals face challenges in minimizing light leakage to semiconductor layers, which can lead to increased leak currents and deteriorated display quality.
Innovation Solution
The display device incorporates a first substrate with a switching element, a pixel electrode, and a first light shielding portion adjacent to the semiconductor layer. The first light shielding portion is strategically located between the semiconductor layer and the light emitting element, closer to the first pixel than the center of the second pixel, to effectively shield light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a reflective layer is added to cover the pixel switching circuit unit, then light leakage to the semiconductor layer is reduced, but device complexity increases
Solution Approach 1:
The patent introduces a light shielding portion as an intermediary element positioned between the light emitting element and the semiconductor layer. This light shielding portion acts as a mediator that blocks light from reaching the semiconductor layer, thereby reducing leak currents without requiring a reflective layer that would increase device complexity
Solution Approach 2:
The patent positions the light shielding portion in a specific spatial dimension - between the light emitting element and the semiconductor layer, and closer to the first pixel than to the center of the second pixel. This dimensional positioning allows effective light blocking while maintaining a simple device structure without adding reflective layers
2Object-affected harmful factors
If the light shielding portion is positioned closer to the first pixel, then light leakage to the first pixel's semiconductor layer is reduced, but the area available for the second pixel decreases
Solution Approach 1:
The patent applies local quality by positioning the light shielding portion specifically in the second pixel region, closer to the first pixel than to the center of the second pixel. This localized positioning provides effective light shielding for the first pixel's semiconductor layer while minimizing the impact on the second pixel's display area, achieving optimal balance between light blocking and area preservation
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
This configuration significantly reduces light reaching the semiconductor layer, thereby suppressing leak currents and maintaining high display quality by minimizing luminance reduction and electric potential variations.
Implementation Method 1
a first light shielding portion arranged in the second pixel and being adjacent to the semiconductor layer, the first light shielding portion being located between the semiconductor layer and the light emitting element in planar view
Implementation Method 2
a display device using a polymer dispersed liquid crystal capable of switching a scattering state in which incident light is scattered and a transmissive state in which incident light is transmitted
Data Source
AI summary
According to one embodiment, a display device including a first substrate including a first pixel and a second pixel, a second substrate, a liquid crystal layer containing polymer and liquid crystal molecules, and a light emitting element, wherein the second pixel is located between the light emitting element and the first pixel, the first substrate includes a switching element including a semiconductor layer arranged in the first pixel, a pixel electrode, and a first light shielding portion arranged in the second pixel and being adjacent to the semiconductor layer, the first light shielding portion is located between the semiconductor layer and the light emitting element in planar view and located on a side closer to the first pixel than a center of the second pixel.