Transistor Substrate Slit Overlap to Shield Display Light Leaks

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Solution Overview

Problem

Existing display devices, such as liquid-crystal displays, suffer from narrow visual angles and inadequate aperture and contrast ratios, which limit their performance.

Innovation Solution

A transistor substrate design featuring a first electrode with a slit, including a curved portion, where the second or third electrode overlaps the slit, forming an overlapping region that shields light leaks at the curved portion, thereby improving aperture and contrast ratios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a slit is introduced in the electrode to improve liquid crystal alignment, then the visual angle and response time are improved, but light leaks occur at the curved portion of the slit reducing aperture ratio and contrast ratio

Engineering Contradiction:

Improveresponse timeVSAvoidlight leaks

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

A light-shielding layer is introduced as an intermediary element between the slit and the liquid crystal layer. This layer specifically targets and blocks light leaks at the curved portion of the slit without interfering with the liquid crystal alignment function of the slit, thus resolving the contradiction between improved response time and prevention of light leaks

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light-shielding layer is selectively positioned only at the curved portion of the slit where light leaks occur, rather than covering the entire electrode structure. This localized approach maintains the overall functionality of the slit for liquid crystal alignment while specifically addressing the light leak problem in the critical curved region

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the slit structure is optimized for liquid crystal alignment, then the visual angle is improved, but the aperture ratio is reduced due to light leaks at the curved portion

Engineering Contradiction:

Improvevisual angleVSAvoidaperture ratio

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The light-shielding layer acts as a mediator that allows the slit structure to maintain its optimized geometry for wide visual angle performance while simultaneously preventing light leaks that would otherwise reduce the effective aperture ratio. The shielding layer fills the functional gap between these two requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The curved portion of the slit, which inherently causes light leaks and reduces aperture ratio, is covered by the light-shielding layer. This converts the harmful light leak effect into a beneficial situation where the curved slit geometry can be fully utilized for improving visual angle without the penalty of light leaks

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12461417B2Transistor substrate

Publication Date: 2025.11.04 INNOLUX CORP

AI summary

A transistor substrate is provided. The transistor substrate includes a first electrode and a second electrode. The first electrode has a slit. The slit includes a curved portion. The first electrode is used for receiving a common voltage signal. The second electrode overlaps the first electrode. The second electrode and the curved portion of the slit have an overlapping region, and an area of the overlapping region is 0.2 times to 0.8 times an area of the curved portion.