LCD Blind Hole Light Leakage Prevention

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Solution Overview

Problem

In full-screen mobile phones, light leakage from the backlight module into holes in the LCD panel affects the operation of photosensitive devices like cameras, and existing solutions either compromise screen ratio or increase processing costs.

Innovation Solution

A liquid crystal display (LCD) design featuring a backlight module with a blind hole, a sealant adhered to the inner wall, and a light shielding layer to prevent light leakage, with the sealant and light shielding layer integrated for bonding and light blocking, respectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a through hole is used in the LCD panel to accommodate a camera or sensor, then the screen ratio is improved, but light from the backlight module leaks into the hole and affects the photosensitive device

Engineering Contradiction:

Improvescreen ratioVSAvoidlight leakage

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The through hole is divided into two segments: a first through hole in the backlight module and a second through hole in the first polarizer. These segments are offset from each other, creating a blind hole that blocks light paths while maintaining the functional opening for the camera/sensor.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first polarizer acts as an intermediary component between the backlight module and the LCD panel. By positioning the second through hole in the first polarizer offset from the first through hole, it mediates the light path to prevent direct illumination of the photosensitive device while allowing necessary light transmission.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If a sealant is used to fill the hole and block light, then light leakage is prevented, but the screen ratio is reduced and processing costs increase

Engineering Contradiction:

Improvelight leakageVSAvoidscreen ratio

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

Instead of filling the hole with sealant, the solution extracts the light-blocking function by strategically positioning offset through holes in the backlight module and first polarizer. This creates a blind hole structure that blocks light without requiring sealant material, thereby maintaining screen ratio.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The light-blocking function is localized to specific regions where the offset through holes are positioned. The first through hole in the backlight module and the second through hole in the first polarizer are offset such that they create a blind hole only in the region where light would otherwise reach the photosensitive device, without affecting the overall display area.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If multiple components are added to block light leakage, then light blocking is improved, but device complexity and processing costs increase

Engineering Contradiction:

Improvelight leakageVSAvoidprocessing complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The light-blocking function is merged into the existing structure of the backlight module and first polarizer by incorporating offset through holes in these components. This integration eliminates the need for separate light-blocking components or complex assembly processes, reducing overall device complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 allows for a higher screen ratio while effectively blocking light from the backlight module, ensuring normal operation of photosensitive devices without increasing processing costs or compromising light transmittance.

Implementation Method 1

the sealant is adhered to an inner wall of the blind hole, and the sealant is fixedly connected to the backlight module, the LCD panel and the first polarizer by bonding

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

The LCD panel has a light shielding layer, the light shielding layer surrounds the first through hole

Methodology Applied

Scientific EffectLight shielding: Absorption (EM radiation)

Data Source

PatentEP3734356B1LCD and display device

Publication Date: 2024.01.03 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

The present disclosure discloses an LCD and a display device, and belongs to the field of display technologies. The LCD includes: an LCD panel (1), a backlight module (2), a sealant (3), and a first polarizer (4). The backlight module (2) is located at one side of the LCD panel (1). The first polarizer (4) is located between the LCD panel (1) and the backlight module (22), the backlight module (2) has a first through hole (5) thereon, and the first polarizer (4) has a second through hole (6) thereon. The first through hole (5), the second through hole (6) and the LCD panel (1) define a blind hole (7), the sealant (3) is adhered to an inner wall of the blind hole (7), and the sealant (3) is fixedly connected to the backlight module (2), the LCD panel (1) and the first polarizer (4) by bonding.