Reflective LCD Light Shielding Between Electrodes and Transistors
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Solution Overview
Problem
Reflective type liquid crystal display devices experience light leakage into thin film transistors due to extraneous light entry, which degrades display quality, despite being designed to prevent such entry.
Innovation Solution
Incorporating an extraneous light entry suppressing layer, such as a metal film or black resist, between pixel electrodes and thin film transistors, and using a half mirror or retardation layer to block or absorb extraneous light, thereby preventing its entry into the transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reflective type liquid crystal display device is used to prevent light leakage into thin film transistors, then light leakage is considered unlikely, but extraneous light still enters the thin film transistor causing display quality degradation
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the pixel electrode and the thin film transistor. This layer acts as a mediator that blocks extraneous light from reaching the transistor while allowing the display function to operate normally, thus resolving the contradiction between reflective type design and light leakage prevention
2Ease of manufacture
If the display device structure is simplified without additional light shielding layers, then manufacturing cost and process complexity are reduced, but light leakage into thin film transistors occurs degrading display quality
Solution Approach 1:
The light shielding layer is merged with the existing pixel electrode structure, forming an integrated component. The shielding layer is formed in the same manufacturing process as the pixel electrode patterns, combining the light shielding function with the existing electrode structure without requiring separate manufacturing steps, thus maintaining ease of manufacture while improving display quality
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 suppresses light leakage into thin film transistors, enhancing display quality and reliability by minimizing flicker and maintaining high definition without additional process complexity or cost.
Implementation Method 1
a light shielding layer as an extraneous light entry suppressing layer provided between a back surface of the pixel electrode and each of the thin film transistors
Implementation Method 2
a plurality of pixel electrodes that reflect extraneous light entering the reflective type display device from a display side substrate side through a light modulating layer toward the display side substrate side
Data Source
AI summary
According to one embodiment, a reflective type liquid crystal display device provided can suppress light leakage into a thin film transistor due to entry of extraneous light. An array substrate includes a glass substrate, a plurality of thin film transistors, a plurality of pixel electrodes, and a metal film. The plurality of thin film transistors are provided to the glass substrate. The plurality of pixel electrodes are spaced apart from each other and driven by the thin film transistors. The plurality of pixel electrodes reflect extraneous light entering the reflective type display device from a counter substrate side. The metal film is provided between a gap between the pixel electrodes and each of the thin film transistors.