Backlight Module Using Color-Temperature-Varied Side Light Sources
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Solution Overview
Problem
Current backlight modules using high-strength materials like glass for light guide plates face significant color shift issues due to light absorption, particularly blue light, leading to non-uniform emission and affecting display quality, while also requiring thicker modules to avoid deformation.
Innovation Solution
Incorporating second light sources with varying color temperatures along the sides of the light guide plate to compensate for light absorption, ensuring uniform light emission and preventing color shift, allowing for the use of thinner glass without additional support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If acrylic plate is used as light guide plate, then light absorption is reduced and uniform emission is obtained, but temperature resistance and strength are low requiring thicker plates and support structures
Solution Approach 1:
The patent changes the material parameter from acrylic to glass, which has superior strength and temperature resistance properties. This parameter change resolves the contradiction by providing both the required mechanical strength and maintaining optical performance through proper design adjustments.
Solution Approach 2:
The patent uses a composite structure combining glass light guide plate with specifically designed reflector geometry. The reflector acts as a compensating element that works synergistically with the glass material to achieve uniform light distribution while utilizing the inherent strength advantages of glass.
2Strength
If acrylic plate thickness is increased to avoid bending deformation, then strength is improved, but overall module thickness increases affecting miniaturization
Solution Approach 1:
The patent changes the material from acrylic to glass, which has higher intrinsic strength. This allows the light guide plate to maintain sufficient strength with reduced thickness, directly resolving the contradiction between strength and module thickness.
Solution Approach 2:
The patent applies local quality optimization by designing a specific reflector geometry that compensates for light absorption characteristics at different positions. This localized optimization allows thinner glass plates to achieve uniform light emission without requiring increased overall thickness.
3Length of stationary object
If glass light guide plate is used to reduce thickness, then module miniaturization is improved, but color shift occurs due to light absorption
Solution Approach 1:
The patent designs the reflector with position-dependent characteristics that compensate for the light absorption properties of glass at different locations. The reflector geometry is optimized to provide enhanced reflection where absorption is higher, maintaining color uniformity across the entire light guide plate surface.
Solution Approach 2:
The patent implements preliminary anti-action by pre-compensating for the expected light absorption effects of glass through the reflector design. The reflector geometry is calculated in advance to counterbalance the absorption characteristics, preventing color shift before it occurs during light propagation.
4Stability of the object's composition
If reflector geometry is optimized to compensate for light absorption, then color uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the reflector geometry parameters to achieve a balance between color uniformity compensation and manufacturability. The geometric parameters are selected to provide effective light compensation while remaining compatible with standard manufacturing processes for glass components.
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 configuration maintains high strength and reduces module thickness while ensuring uniform backlight emission, enhancing display quality by compensating for absorbed light and preventing color shift phenomena.
Implementation Method 1
a plurality of second light sources arranged along at least one of two sides perpendicular to the first side, wherein the plurality of second light sources have different color temperatures
Implementation Method 2
values of the color temperatures of the second light sources at different positions are determined according to light absorption characteristics of the light guide plate so as to compensate for the light absorbed by the light guide plate
Data Source
AI summary
A backlight module includes a light guide plate; a first light source arranged along a first side of the light guide plate; a plurality of second light sources arranged along at least one of the two sides perpendicular to the first side, wherein the plurality of second light sources have different color temperatures, and values of the color temperatures of the second light sources at different positions are determined according to the light absorption characteristics of the light guide plate so as to compensate for the light absorbed by the light guide plate corresponding to the color temperature of the second light source.