Backlight Module Light-Shielding Bar Segmentation
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Solution Overview
Problem
Conventional illuminated touch devices face issues with adjacent light interference and residual images due to the inability to independently control light-emitting components, leading to misleading user interactions.
Innovation Solution
A backlight module with a light guide plate, light source assembly, and light-shielding bar, where the light guide plate consists of interlocking first and second plate bodies with microstructures, and the light-shielding bar blocks light penetration between the plates, preventing erroneous illumination and allowing each block to display a predetermined pattern independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all light-emitting components are lit up uniformly, then the touch panel is well illuminated, but adjacent light interference and residual images occur preventing regional display
Solution Approach 1:
The light guide plate is divided into multiple independent blocks (first blocks and second blocks) with light-shielding walls between them. Each block receives light from dedicated light-emitting components and cannot transmit light to adjacent blocks, enabling independent control of each region for display purposes while eliminating adjacent light interference.
Solution Approach 2:
Different regions of the light guide plate are given different functional qualities - some blocks are illuminated while others remain dark, allowing specific regions to display virtual buttons or images while other regions remain inactive. The light-shielding walls ensure each block maintains its local illumination state independently.
2Adaptability or versatility
If light-emitting components are independently controlled for regional display, then virtual buttons can be displayed in specific regions, but light leakage between blocks causes residual images
Solution Approach 1:
The light guide plate is segmented into multiple isolated blocks with light-shielding walls preventing light transmission between blocks. This segmentation ensures that when certain blocks are illuminated for regional display, light cannot leak to adjacent blocks, thereby eliminating residual images and improving display accuracy.
Solution Approach 2:
Light-shielding walls act as intermediary barriers between adjacent light-emitting blocks. These walls block light paths that would otherwise cause cross-contamination between regions, ensuring that illuminated blocks do not create residual images in adjacent dark blocks, thus maintaining reliable regional display.
3Device complexity
If a single light guide plate is used, then the structure is simple, but light cannot be independently controlled in different regions
Solution Approach 1:
The light guide plate is divided into multiple independent blocks with light-shielding walls between them. Each block can be independently controlled by dedicated light-emitting components, enabling regional display functionality while maintaining a relatively simple overall structure based on the familiar light guide plate configuration.
Solution Approach 2:
Each block of the light guide plate serves itself independently through dedicated light-emitting components and light-shielding walls. The blocks do not interfere with each other's illumination, allowing each region to autonomously display content as needed without requiring complex centralized control systems.
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 solution effectively reduces adjacent light interference and residual images, enabling each block to display a distinct pattern, enhancing user interaction by preventing simultaneous image display and improving visibility and touch accuracy.
Implementation Method 1
The light-shielding bar is at an outer periphery of the light guide plate and extends at an intersection between the first plate body and the second plate body, for blocking penetration of light between the first plate body and the second plate body
Implementation Method 2
The light source assembly includes a plurality of first light-emitting components and a plurality of second light-emitting components arranged opposite to each other in a staggered manner
Data Source
AI summary
An illuminated touch device includes a circuit board, a backlight module, and a cover plate. The backlight module includes a light guide plate, a light source assembly, and a light-shielding bar. The light guide plate includes a first plate body and a second plate body fitted with each other. The first plate body has a plurality of first microstructures, and the second plate body has a plurality of second microstructures. The light-shielding bar is at an outer periphery of the light guide plate and extends at an intersection between the first plate body and the second plate body, for blocking penetration of light between the first plate body and the second plate body. The cover plate includes first transparent regions and second transparent regions respectively corresponding to the first microstructures and the second microstructures.