Light Guide Plate Diffusion Dot Design for Display Backlight
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Solution Overview
Problem
The light leak phenomenon occurs around the active area of display panels due to incomplete excitation of blue light at the periphery of quantum dot enhancement films (QDEF) and reflection by plastic frames, leading to nonuniform color and light leakage.
Innovation Solution
A display device design featuring a light guide plate with first and second diffusion dots of different diameters, where the first dots are arranged corresponding to the active area and the second dots are arranged at the periphery, guiding light uniformly to a light converting film to prevent light leaks, and the second area of the light guide plate reduces light intensity to minimize leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a quantum dot enhancement film (QDEF) is used to enhance color rendering, then color saturation and color rendering index are improved, but light leak phenomenon occurs at the periphery due to incomplete phosphor particle coverage
Solution Approach 1:
The patent applies local quality by differentiating the light guide plate into two distinct areas: a first area corresponding to the active area with larger first diffusion dots, and a second area corresponding to the periphery with smaller second diffusion dots. This localized differentiation ensures that the periphery area (where light leaks occur) receives appropriate light diffusion control, while the active area maintains optimal light intensity for color rendering.
2Strength
If a plastic frame is disposed around the backlight module for structural support, then mechanical strength is improved, but blue light reflection occurs causing nonuniform color
Solution Approach 1:
The patent extracts the problematic plastic frame from the optical path by providing an alternative light guide plate structure that extends to the display panel edges. This eliminates the need for a reflective plastic frame while maintaining structural support, thereby removing the source of blue light reflection and color nonuniformity.
3Ease of manufacture
If diffusion dots of uniform size are used across the light guide plate for simplicity, then manufacturing complexity is reduced, but light distribution uniformity deteriorates
Solution Approach 1:
The patent implements local quality by specifying different diffusion dot diameters for different regions: larger first diffusion dots (first diameter) in the first area corresponding to the active area, and smaller second diffusion dots (second diameter smaller than first diameter) in the second area corresponding to the periphery. This regional differentiation optimizes light distribution uniformity while remaining manufacturable.
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
Prevents light leaks and ensures uniform light distribution, enhancing color rendering and reducing nonuniform color issues by effectively guiding light to the light converting film, thereby maintaining a consistent display quality.
Implementation Method 1
The first diffusion dots and the second diffusion dots guide the first color light to the light converting film uniformly
Implementation Method 2
When the two types of phosphor particles are irradiated by blue light, the blue light will excite the two types of phosphor particles to generate red light and green light
Data Source
AI summary
A display device includes a display panel and a backlight module. The display panel has an active area. The backlight module includes a light guide plate, a light converting film and a side-emitting light source. The light guide plate includes a plurality of first diffusion dots and a plurality of second diffusion dots, wherein the first diffusion dots are arranged corresponding to the active area, the second diffusion dots are arranged corresponding to a periphery of the active area, and a diameter of the second diffusion dot is smaller than a diameter of the first diffusion dot. The side-emitting light source is used for emitting a first color light into the light guide plate. The first diffusion dots and the second diffusion dots guide the first color light to the light converting film uniformly. The light converting film converts the first color light into a second color light.