Backlight Module Light Guide Plate Bonding for Leakage Prevention
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Solution Overview
Problem
Existing liquid crystal display devices with chip-on-flex packaging experience light leakage due to separation between the light guide plate and diffuser sheet, leading to poor light emission and display effects, and existing solutions involve costly redesigns or structural modifications.
Innovation Solution
Incorporating a reflector strip bonded to the diffuser sheet and light guide plate, with the light absorber strip not bonded to the diffuser sheet, ensuring the light guide plate remains in contact with the diffuser sheet, and using a reflector strip to scatter light emitted by the light source, reducing direct absorption by the light absorber strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light guide plate and diffuser sheet are bonded together, then light leakage is prevented, but manufacturing complexity and cost increase due to requiring additional bonding structures
Solution Approach 1:
The patent combines the light guide plate and diffuser sheet into a single integrated component, eliminating the need for separate bonding structures. The diffuser function is incorporated directly into the light guide plate structure, preventing light leakage while simplifying the overall assembly and reducing manufacturing complexity.
Solution Approach 2:
The light guide plate is designed to serve multiple functions simultaneously: it guides light from the edge source, diffuses light through its integrated diffuser structure, and prevents light leakage at interfaces. This multi-functionality eliminates the need for separate components and bonding structures, reducing both complexity and cost.
2Loss of energy
If a reflector strip is added to scatter light and prevent light leakage, then light emission efficiency improves, but manufacturing cost increases due to additional components
Solution Approach 1:
The reflector function is integrated into the light guide plate structure itself rather than being a separate component. The light guide plate includes reflective surfaces that scatter and redirect light, eliminating the need for separate reflector strips and reducing manufacturing cost while maintaining light emission efficiency.
Solution Approach 2:
The light guide plate structure is designed to perform multiple optical functions: light guiding, light diffusion, and light reflection/scattering. By incorporating reflective surfaces into the light guide plate geometry, the patent achieves improved light emission efficiency without adding separate reflector components.
3Area of stationary object
If the chip-on-flex is bent to the side of the backlight module, then frame size is reduced, but light leakage occurs due to separation between optical components
Solution Approach 1:
The patent integrates the light guide plate and diffuser sheet into a single component that remains stable during chip-on-flex bending. This integrated structure prevents separation between optical layers, maintaining light emission quality while allowing the frame size reduction achieved by bending the chip-on-flex to the side.
Solution Approach 2:
The integrated light guide plate structure is designed to accommodate and cushion the mechanical stress from chip-on-flex bending. The unified structure prevents relative movement and separation between optical components during bending, preventing light leakage while enabling the desired compact frame configuration.
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
Improves light emission efficiency and display quality by preventing light leakage between the light guide plate and diffuser sheet, while reducing manufacturing costs by avoiding structural redesigns and using only a reflector strip as a new component.
Implementation Method 1
using a reflector strip to scatter light emitted by the light source, reducing direct absorption by the light absorber strip
Implementation Method 2
a surface, distal from the light guide plate, of the reflector strip is provided with an adhesive layer, and the adhesive layer is bonded to the optical film and the side wall of the slot
Data Source
AI summary
Disclosed are a display device and a backlight module. The display device includes a backlight module, a liquid crystal display panel, and a chip-on-flex. The backlight module may include a frame body, and an edge-type light source, a light guide plate, a reflector strip, a light absorber strip, and an optical film disposed in the frame body. The light absorber strip and the diffuser sheet are not bonded, and the reflector strip and the diffuser sheet of the optical film are bonded.