Backlight Module Positioning Structure for Shadow-Free Optical Film Alignment
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Solution Overview
Problem
The existing backlight modules for LCDs suffer from shadows formed by fixing corners on the frame, which affect the displaying quality due to the placement of positioning structures on the sides, leading to potential displacement of optical films and degradation of optical performance.
Innovation Solution
A backlight module design featuring a light guide plate with positioning structures disposed between light emitting devices, allowing optical films with protruding portions to be securely positioned within accommodating spaces, eliminating the need for frame-mounted fixing corners and preventing light obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixing corners are disposed on the frame of the backlight module for positioning optical films, then the optical films can be fixed and positioned to avoid displacement, but shadows are formed by the fixing corners on the screen of the LCD module which directly affect the displaying quality
Solution Approach 1:
The positioning structure is moved from the frame (side dimension) to the light guide plate (central dimension), changing the spatial location from peripheral to central positioning. This allows the optical film to be positioned from above rather than from the sides, eliminating shadow formation on the screen while maintaining positioning effectiveness
Solution Approach 2:
The positioning function is extracted from the frame structure and integrated into the light guide plate. The fixing corners are removed from the frame and replaced by positioning structures on the light guide plate, separating the positioning function from the frame's structural role
2Stability of the object's composition
If fixing corners are used on the frame to position optical films, then the optical films are secured, but the fixing corners block light emitted from light emitting devices causing shadows
Solution Approach 1:
The positioning approach shifts from horizontal positioning at the frame edges to vertical positioning from above via the light guide plate. This dimensional change allows light to pass unobstructed from the light emitting devices while the optical film remains securely positioned by the protruding portions engaging with the positioning structures
Solution Approach 2:
The light guide plate serves as an intermediary between the light emitting devices and the optical films. It transmits light from the devices while its positioning structures provide the securing function, mediating between light transmission and positioning requirements
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 design enhances the alignment and stability of optical films while preventing shadows and displacement, thereby improving the optical performance and displaying quality by ensuring the positioning structures do not block light emitted from the devices.
Implementation Method 1
The light source has a plurality of light emitting devices
Implementation Method 2
The main body portion is connected to the light entrance portion and has a first light extraction surface
Data Source
AI summary
A backlight module includes a light source, a light guide plate and at least one optical film. The light source has a plurality of light emitting devices. The light guide plate includes a light entrance portion, a main body portion and at least one positioning structure. The light entrance portion has a top surface and a light entrance surface. The light source is disposed corresponding to the light entrance surface. The top surface is adjacently connected to the light entrance surface. The main body is connected to the light entrance portion and has a first light extraction surface connecting the top surface. The positioning structure is disposed on the top surface and corresponding to an interval between two adjacent light emitting devices, and has an accommodating space. The optical film is disposed above the light guide plate and has at least one protruding portion disposed in the accommodating space.