Transmissive LCD Light Shielding for TFT Reliability
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Solution Overview
Problem
In liquid crystal display devices, incident light often spreads and inadvertently hits the boundary area, causing improper operation of the TFT switching element due to light reflection.
Innovation Solution
A light transmissive-type liquid crystal display device design featuring a lattice-like wiring pattern, a light-shielding body with a refractive index higher than the first insulator, and a second insulator with a higher refractive index than the first, which blocks light from reaching the switching element by forming a lattice-like pattern and surrounding the second insulator's periphery with a light-shielding body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a boundary area is created to separate the opening area from the TFT array substrate, then light guidance is improved, but light spreading causes improper operation of the TFT switching element
Solution Approach 1:
A light-shielding body is introduced as an intermediary element between the boundary area and the TFT switching element. This light-shielding body blocks stray light from reaching the TFT, preventing improper operation while preserving the light guidance function of the boundary area structure.
Solution Approach 2:
The light-shielding body is selectively positioned only in regions where stray light may affect the TFT switching element, rather than uniformly across the entire device. This localized approach maintains light guidance in other areas while protecting sensitive regions from light interference.
2Reliability
If a light-shielding body is added to block light from the switching element, then TFT operation reliability is improved, but device complexity increases
Solution Approach 1:
The light-shielding body is merged with existing structural elements of the liquid crystal display device, such as the counter substrate or insulator layers. By combining the light-shielding function with existing components, the device complexity is minimized while still achieving the desired light blocking effect.
Solution Approach 2:
The light-shielding body serves multiple functions: it blocks stray light from reaching the TFT switching element, and simultaneously acts as part of the overall device structure (e.g., as an insulator or structural support). This multi-functionality reduces the need for separate dedicated light-shielding components.
3Use of energy by moving object
If the boundary area is designed to reflect light, then light utilization is improved, but light incident on the boundary area may still reach the TFT causing improper operation
Solution Approach 1:
The light-shielding body acts as a mediator that intercepts and blocks stray light before it can reach the TFT switching element, even when the boundary area reflects light. This ensures that the light reflection function is maintained while preventing harmful light incidence on the TFT.
Solution Approach 2:
The light-shielding body is positioned to preemptively block stray light paths before the light can reach the TFT switching element. By establishing this protective barrier in advance, the system prevents potential harmful effects before they occur.
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 light incidence on the switching element, preventing improper operation and enhancing light utilization efficiency while simplifying manufacturing and avoiding sub-trench formation.
Implementation Method 1
a light-shielding body overlapping in the plan view with the first insulator, the light-shielding body being arranged between the first insulator and the base member
Implementation Method 2
a second insulator having translucency, the second insulator overlapping in the plan view with the pixel electrode and being arranged between the base member and the pixel electrode to be in contact with the first insulator, and having a refractive index higher than a refractive index of the first insulator
Data Source
AI summary
Provided is a light transmissive-type liquid crystal display device including a first substrate, a second substrate, and a liquid crystal layer, wherein the first substrate includes a base member, a wiring, a switching element, a pixel electrode, and a first insulator having translucency, the first insulator overlapping in the plan view with the wiring and being arranged between the base member and the pixel electrode, a second insulator having translucency, the second insulator overlapping in the plan view with the pixel electrode and being arranged between the base member and the pixel electrode to be in contact with the first insulator, the second insulator having a refractive index higher than a refractive index of the first insulator, and a light-shielding body provided along an outer periphery of a surface of the second insulator on the base member side, the light-shielding body being arranged in contact with the second insulator.