Display Substrate Notch Layout for TFT Crack Resistance

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Solution Overview

Problem

Existing display devices face a high possibility of substrate cracking, particularly in the TFT substrate, due to insufficient reinforcement during assembly.

Innovation Solution

The display device design includes a color filter (CF) substrate and thin film transistor (TFT) substrate configuration with a notch on the CF substrate, allowing a flexible printed circuit (FPC) to be mounted on the TFT substrate, reducing the non-overlapping area and enhancing reinforcement, and incorporating a chip-on-glass (COG) or chip-on-film (COF) for control, with flexible wiring boards to minimize impact vulnerability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the CF substrate completely overlaps the TFT substrate, then the reinforcement area is maximized, but the area available for mounting control circuits and FPC is reduced

Engineering Contradiction:

Improvesubstrate reinforcementVSAvoidmounting area

Core Design Contradiction:

StrengthVSArea of stationary object

Solution Approach 1:

The CF substrate is divided into two functional zones: a first region that overlaps with the TFT substrate to provide reinforcement, and a second region that extends beyond the TFT substrate to provide mounting area for control circuits and FPC. This segmentation resolves the contradiction by spatially separating the reinforcement function from the mounting function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the CF substrate are assigned different functions: the first region (overlapping area) provides structural reinforcement, while the second region (non-overlapping area) provides mounting space. This local differentiation allows the same substrate to simultaneously satisfy both requirements of reinforcement and mounting area.

Inventive Principle:

Principle #3Local quality

2Reliability

If the non-overlapping area of the CF substrate is minimized, then substrate reinforcement is improved, but the mounting flexibility for FPC and control circuits is reduced

Engineering Contradiction:

Improvesubstrate breakage resistanceVSAvoidmounting flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The CF substrate is segmented into a first region for reinforcement and a second region for mounting, allowing both reliability and adaptability to be satisfied in different spatial zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The CF substrate serves multiple functions: it acts as both a structural reinforcement layer (first region) and a mounting platform for control circuits and FPC (second region). This multi-functionality resolves the contradiction between reliability and adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20250389995A1Display device

Publication Date: 2025.12.25 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A display device comprises a stack of a color filter (CF) substrate and a thin film transistor (TFT) substrate having a TFT, wherein the TFT substrate has a first side, the CF substrate has a second side overlapping the first side partly, the CF substrate overlaps the TFT substrate at both ends of the second side and has a notch between both ends of the second side, and a flexible printed circuit (FPC) configured to control the TFT is mounted on a region of the TFT substrate corresponding to the notch.