Light Guide Plate Annular Protrusions Backlight Uniformity
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Solution Overview
Problem
Existing light guide plates in sidelight emission type backlight modules for LCDs suffer from inferior brightness and uniformity due to total reflections, which are not adequately addressed by current solutions that complicate manufacturing and assembly.
Innovation Solution
A light guide plate with a light incidence face featuring at least one surface defined by annular protrusions or recesses to enhance diffusive capability and uniformity, integrated into a backlight module and LCD design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If additional optical sheets or design modifications are provided to remedy total reflections, then brightness and uniformity are improved, but manufacturing complexity increases
Solution Approach 1:
The light guide plate is divided into multiple regions with different surface structures - a first region with a first surface and a second region with a second surface. This segmentation allows different areas to serve different optical functions, improving brightness distribution without requiring additional optical sheets.
Solution Approach 2:
Different surface structures are applied to different regions of the light guide plate based on local optical requirements. The first surface and second surface have different characteristics optimized for their specific positions, enabling localized control of light diffusion and reflection properties.
2Illumination intensity
If additional optical sheets or design modifications are provided to remedy total reflections, then uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The light guide plate is segmented into regions with different surface characteristics that work together to achieve uniform light distribution. The first region and second region have complementary optical functions that collectively improve uniformity without adding separate components.
Solution Approach 2:
Multiple optical functions (light diffusion, reflection, and direction control) are merged into a single integrated light guide plate structure. The different surfaces combine their effects to achieve uniform light output, eliminating the need for separate optical sheets.
3Duration of action of moving object
If total reflections occur in the light guide plate, then light is delayed from emitting out, but brightness and uniformity deteriorate
Solution Approach 1:
Different surface structures are applied in different regions to control light behavior locally. The first surface and second surface create different optical paths that reduce excessive total reflection in certain areas, allowing light to exit at appropriate times while maintaining brightness.
Solution Approach 2:
Instead of allowing total reflection to dominate light propagation, the invention inverts the approach by using specific surface structures to promote light extraction at desired locations and times, reversing the conventional total reflection-based guidance mechanism.
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 improves light brightness and uniformity in the backlight module and LCD by effectively diffusing light, resulting in enhanced luminosity and display quality without increasing manufacturing complexity.
Implementation Method 1
indispensable total reflections occur when the lights initially travel through the light guide plate
Implementation Method 2
The surface is defined by at least one annular protrusion or recess to enhance diffusive capability and uniformity of lights
Data Source
AI summary
A light guide plate for a liquid crystal display is disclosed. The light guide plate is adapted for use in a side-light emission type of backlight module. The light guide plate comprises a light incidence face that has at least one surface having at least one annular protrusion or recess, thereby enhancing the capability of light diffusion, uniformity of the light distribution, as well as promoting brightness.