Liquid Crystal Display Light Leakage Prevention

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Solution Overview

Problem

In liquid crystal display apparatuses with built-in light receiving elements, 'light leakage' occurs due to backlit transmission through the light receiving region, deteriorating image picture quality, especially when forming a light blocking layer on the TFT array substrate is challenging and requires increased area, affecting the numerical aperture and image quality.

Innovation Solution

A liquid crystal display apparatus is designed with a light receiving region where a light blocking mechanism is implemented using polarizing plates and a liquid crystal layer to intercept light from the backlight, preventing 'light leakage' by blocking light from the first substrate side towards the second substrate side, and utilizing a black matrix layer to partition pixels and block light, ensuring that only intended light is received by the light receiving elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a light receiving region is opened to allow light transmission for touch detection, then touch detection function is enabled, but backlight leaks through to the front face causing image picture quality deterioration

Engineering Contradiction:

Improvetouch detection functionVSAvoidbacklight leakage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the optical properties of different regions: the black matrix layer blocks light in non-touch detection areas while the light receiving region allows light transmission for touch detection. This spatial differentiation of optical properties resolves the contradiction between enabling touch detection and preventing backlight leakage in the display region.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces a black matrix layer as an intermediary element that selectively blocks backlight in the display region while allowing light reception in the touch detection region. This intermediary structure mediates between the conflicting requirements of display quality and touch detection functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a light blocking layer is formed on the TFT array substrate to prevent backlight leakage, then image picture quality improves, but the area required increases affecting numerical aperture

Engineering Contradiction:

Improvebacklight leakage preventionVSAvoidlight blocking layer area

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The black matrix layer is strategically positioned only in the light receiving region where touch detection occurs, rather than covering the entire substrate. This localized approach prevents backlight leakage without unnecessarily reducing the numerical aperture of the display region, resolving the contradiction between leakage prevention and area conservation.

Inventive Principle:

Principle #3Local 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

This configuration effectively prevents 'light leakage' in the light receiving region, thereby improving the image picture quality by ensuring that only intended light is received by the light receiving elements, enhancing the display's overall image quality.

Implementation Method 1

the liquid crystal panel having a light receiving region in which a light receiving element is formed on one of faces of the first and second substrates which oppose to each other in such a manner as to receive light advancing from the second substrate side toward the first substrate side, and the first and second polarizing plates and the liquid crystal layer being disposed such that light advancing from the first substrate side toward the second substrate side is blocked in the light receiving region

Methodology Applied

Scientific EffectLight blocking by liquid crystal layer: Absorption (EM radiation)

Implementation Method 2

a light blocking mechanism is implemented using polarizing plates and a liquid crystal layer to intercept light from the backlight, preventing 'light leakage' by blocking light from the first substrate side towards the second substrate side

Methodology Applied

Scientific EffectLight interception by polarizing plates: Absorption (EM radiation)

Implementation Method 3

utilizing a black matrix layer to partition pixels and block light, ensuring that only intended light is received by the light receiving elements

Methodology Applied

Scientific EffectLight blocking by black matrix layer: Absorption (EM radiation)

Data Source

PatentUS8558974B2Liquid crystal display apparatus

Publication Date: 2013.10.15 MAGNOLIA WHITE CORP

AI summary

Disclosed herein is a liquid crystal display apparatus, including: a liquid crystal panel having a display region for displaying an image and having a plurality of pixels disposed in the region; and a pair of first and second polarizing plates provided in an opposing relationship to each other through the display region; the liquid crystal panel including a first substrate, a second substrate opposed in a spaced relationship to the first substrate, and a liquid crystal layer sandwiched by and between the first and second substrates and oriented.