Textured Light Guide Plate Friction Management
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Solution Overview
Problem
In electronic displays, non-uniformities in films used with light guide plates can occur due to differences in thermal expansion and contraction rates between the light guide plate and the film, leading to wrinkles and non-uniform appearances.
Innovation Solution
A textured surface on the light guide plate with features such as dots, bumps, or grooves reduces friction between the light guide plate and the film, allowing them to expand and contract independently without affecting the film's planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a smooth surface is used on the light guide plate, then the film can be easily positioned and assembled, but the film develops wrinkles and non-uniformities when temperature changes cause differential expansion and contraction
Solution Approach 1:
The light guide plate surface is divided into two distinct zones: a smooth peripheral region for easy film positioning and assembly, and a textured interior region that reduces friction during thermal expansion/contraction. This local differentiation allows the film to be easily positioned during manufacturing while preventing wrinkles during operation through the low-friction textured surface in the critical interior area.
Solution Approach 2:
The surface of the light guide plate is segmented into functionally distinct regions: a smooth peripheral surface and a textured interior surface. This segmentation allows different surface properties to serve different purposes - the smooth periphery facilitates film positioning and assembly, while the textured interior prevents friction-induced wrinkles during thermal cycling.
2Reliability
If a textured surface is added to reduce friction, then the film can expand and contract independently without wrinkles, but the manufacturing process becomes more complex
Solution Approach 1:
The textured surface is applied locally only to the interior region of the light guide plate where thermal expansion differences cause the most friction, while the peripheral region remains smooth. This localized application reduces the overall complexity of the manufacturing process compared to texturing the entire surface, while still providing the friction-reduction benefit where it is most needed.
3Adaptability or versatility
If the light guide plate and film are made from different materials with different thermal expansion rates, then they can respond independently to temperature changes, but the friction between them increases causing film wrinkles
Solution Approach 1:
The patent accepts the inevitable friction that arises from using different materials with different thermal expansion rates, and converts this harmful friction into a beneficial effect by texturing the light guide plate surface. The textured surface creates a low-friction interface that actually reduces the harmful friction forces, allowing the different thermal expansion rates to work in favor of independent thermal response rather than causing wrinkles.
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
The textured surface enables the light guide plate and film to move relative to each other during temperature changes, maintaining a uniform display appearance by preventing wrinkles and non-uniformities.
Implementation Method 1
A textured surface on the light guide plate with features such as dots, bumps, or grooves reduces friction between the light guide plate and the film, allowing them to expand and contract independently without affecting the film's planarity.
Implementation Method 2
when temperature changes cause the light guide plate and the film to expand and/or contract at different rates
Data Source
AI summary
Systems, devices, and methods are provided for using a textured surface of a light guide plate to reduce friction between the light guide plate and an adjacent film. A textured surface across an interior region of the light guide may guide light towards a top surface of the textured light guide. A film positioned on the bottom surface of the textured light guide may reflect light towards the top surface. The film may be positioned within the interior region as a substantially flat (e.g., planar) layer. The surface features may reduce the friction to enable the textured light guide plate and/or film to expand or contract independently from one another due to varying temperatures without forming wrinkles on the film or changing the planarity of the film.