Light Guide Plate Grooves for Narrow-Frame Display Yellowing
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Solution Overview
Problem
Narrow-frame display devices experience significant 'before-light visual yellowing' due to the side-in type backlight source, where bluish white light from the light-emitting center of LED lights is not effectively diffused, leading to trapped blue light and yellowish white light at the front end of the light guide plate, causing a yellowing phenomenon.
Innovation Solution
A backlight module design featuring a housing with a light guide plate that includes first regions with grooves corresponding to the light-emitting center of LED lights, facilitating diffuse reflection and mixing of bluish white and yellowish light to form white light, thereby reducing the yellowing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a side-in type backlight source is used in a narrow-frame display device, then the frame can be made narrower, but before-light visual yellowing becomes serious
Solution Approach 1:
The patent applies local quality by creating specific first regions on the light guide plate with different optical properties. These regions contain grooves that enable diffuse reflection specifically at locations corresponding to LED light-emitting centers, while other areas maintain different characteristics. This localized structural modification allows selective light diffusion to mitigate yellowing in critical areas without affecting the overall narrow-frame design.
Solution Approach 2:
The light guide plate is segmented into multiple first regions, each corresponding to a specific LED light-emitting center. This segmentation allows independent optimization of light diffusion in each region, enabling targeted correction of the yellowing problem while maintaining the narrow-frame structure. The grooves in each first region act as independent light diffusion elements.
2Illumination intensity
If mesh points are used for light diffusion, then point light source can be converted to surface light source, but blue light is not effectively diffused leading to yellowing
Solution Approach 1:
The patent changes the optical parameters of the light guide plate by introducing grooves with specific geometric characteristics in the first regions. These grooves have defined depths, widths, and spacing that optimize diffuse reflection of blue light. This parameter modification enables effective blue light diffusion while maintaining overall light uniformity, resolving the yellowing issue caused by insufficient blue light scattering.
Solution Approach 2:
The grooves in the first regions act as intermediary structures that mediate between the LED light sources and the display panel. They provide an additional light diffusion mechanism that complements the mesh points, specifically targeting blue light wavelengths to prevent yellowing while maintaining the surface light source effect.
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 weakens the 'before-light visual yellowing' issue by trapping and mixing bluish white light with yellowish light, producing a more uniform white output and improving the display's visual appearance.
Implementation Method 1
facilitating diffuse reflection and mixing of bluish white and yellowish light to form white light
Data Source
AI summary
A backlight module includes a housing including a bottom plate and side plates, forming a receiving cavity; a backlight source received in the receiving cavity, and including a plurality of LED lights each having a light-emitting center portion for projecting light in a first direction; and a light guide plate received in the receiving cavity, and including a light receiving edge surface facing the backlight source and extending in a second direction, a light-exiting top surface, and a bottom surface. First regions are included on a portion of the bottom surface of the light guide plate close to the light receiving edge surface in one-to-one correspondence to the light-emitting center portion of each LED light of the plurality of LED lights, each of the plurality of first regions having at least one first groove arranged in the first direction and extending in the second direction.