Display Module Light Guide Plate Recessed Connection Design

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Solution Overview

Problem

Conventional display module designs face issues with hot-spot or hot-line problems due to light emission from the upper ear portion of the light guide plate, leading to display quality degradation, and require time-consuming assembly processes involving bending and stacking, which increases module thickness.

Innovation Solution

The design incorporates a light guide plate with recessed portions that complementarily connect to the outer frame, preventing light leakage and reducing thickness by using a first recessed portion on the light guide plate and a corresponding recessed portion on the outer frame, or a connecting ear portion extending into a slot, ensuring secure fixation and uniform light distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the upper ear portion is stacked on the outer frame to fix the light guide plate, then the assembly process is completed, but light leaks from the upper ear portion causing hot-spot or hot-line problems that degrade display quality

Engineering Contradiction:

Improveassembly processVSAvoidlight leakage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent removes the upper ear portion from the light guide plate structure, extracting the problematic element that caused light leakage. Instead of stacking the upper ear on the outer frame, the light guide plate is directly fixed to the outer frame through adhesive tape applied to the bottom surface of the light guide plate, eliminating the source of light leakage and hot-spot problems

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the fixation mechanism into separate functional elements: the light guide plate body, the adhesive tape layer, and the outer frame. This segmentation allows the adhesive tape to specifically address the light leakage issue at the interface between the light guide plate and outer frame, while maintaining structural integrity without requiring protruding upper ear portions

Inventive Principle:

Principle #1Segmentation

2Strength

If the outer frame is driven open or the light guide plate is bent to assemble the upper ear portion, then the light guide plate can be fixed to the outer frame, but the assembly process becomes time-consuming and strenuous

Engineering Contradiction:

Improveconnection strengthVSAvoidassembly time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The patent replaces the mechanical stacking system (requiring frame opening, bending, and stacking operations) with an adhesive bonding system. The adhesive tape is applied to the bottom surface of the light guide plate and bonds it directly to the outer frame, eliminating the need for mechanical manipulation, bending, or complex assembly sequences, thereby dramatically reducing assembly time and effort while maintaining connection strength

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The adhesive tape is pre-applied to the bottom surface of the light guide plate before final assembly, preparing the bonding interface in advance. This preliminary action eliminates the need for complex real-time assembly operations such as bending the light guide plate or driving the frame open, allowing for quick and straightforward fixation

Inventive Principle:

Principle #10Preliminary action

3Strength

If the upper ear portion is stacked on the outer frame, then the light guide plate is fixed, but the panel components and backlight components move upwardly increasing the overall thickness of the display module

Engineering Contradiction:

Improvefixation stabilityVSAvoidmodule thickness

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The patent extracts and removes the upper ear portion that caused the thickness increase. By eliminating this protruding structure and its stacking operation, the panel components and backlight components remain in their original positions without upward movement, thereby maintaining the designed compact thickness of the display module while still achieving secure fixation through adhesive bonding

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8834007B2Display module

Publication Date: 2014.09.16 AU OPTRONICS CORP

AI summary

A display module includes an outer frame, a light emitting unit, a panel device, and a light guide plate having a light entrance surface and a connecting side. A first recessed portion is formed on the connecting side. The outer frame is disposed on the light guide plate and has a second recessed portion formed thereon corresponding to the first recessed portion. The second recessed portion is complementarily connected to the first recessed portion. The light emitting unit is disposed in the outer frame corresponding to the light entrance surface for emitting light into the light guide plate via the light entrance surface. The panel device is disposed on the light guide plate and contained in the outer frame for receiving the light emitted from the light guide plate. The ratio of the length of the first recessed portion to the length of the connecting side is greater than 0.2.