Backlight Module Frameless Light Emission via Total Internal Reflection
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Solution Overview
Problem
Conventional backlight modules for LCD displays suffer from a limited light-emitting area due to the presence of a lightproof adhesive tape, which restricts frameless light emission and results in non-uniform illumination.
Innovation Solution
The proposed backlight module incorporates a light-emitting face with a lightproof adhesive tape, a first and second reflection mirror arranged on a light transmission substrate, and a second light transmission substrate with prisms and scattered particles, allowing for total reflection and transmission of light to expand the light-emitting area beyond the tape's coverage, achieving frameless light emission through strategically positioned light transmission holes and scattering elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lightproof adhesive tape is used to seal the backlight module, then sealing performance is improved, but the light-emitting area is limited and frameless light emission is prevented
Solution Approach 1:
The patent applies total internal reflection to redirect light paths from the adhesive tape area toward the center of the light-emitting face. By changing the light propagation dimension through reflection at specific angles (45 degrees), light that would normally be blocked by the adhesive tape is redirected to contribute to the overall light emission, effectively expanding the functional light-emitting area without compromising sealing.
Solution Approach 2:
The patent introduces a reflection structure (first reflection mirror and second reflection mirror) as an intermediary element between the light source and the adhesive tape. These mirrors act as mediators that redirect light paths, allowing light to bypass the adhesive tape's blocking effect and still contribute to the light-emitting face, thus resolving the conflict between sealing and light emission area.
2Area of stationary object
If the light-emitting area is expanded beyond the adhesive tape coverage, then frameless light emission is achieved, but light distribution uniformity becomes difficult to control
Solution Approach 1:
The patent applies different optical properties to different regions: the first reflection mirror is positioned to reflect light from the adhesive tape area, while the second reflection mirror is positioned to reflect light from the center area. Each mirror is optimized for its specific local function, and the light transmission holes are strategically placed to control light extraction. This localized optimization ensures uniform light distribution across the entire light-emitting face while maintaining the expanded area.
3Area of stationary object
If multiple reflection mirrors are added to expand light emission area, then frameless light emission is achieved, but device complexity increases
Solution Approach 1:
The patent combines the light transmission substrate and the reflection mirrors into an integrated structure. The first and second reflection mirrors are positioned on the light transmission substrate, and the light transmission holes are formed directly in the substrate. This merging of components reduces the number of separate parts and simplifies the overall structure while achieving the expanded light-emitting area through the coordinated action of the integrated elements.
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 enhances light distribution, ensuring uniform illumination and expanding the light-emitting area to cover the adhesive tape, thereby achieving frameless light emission and improving the visual effect of the display.
Implementation Method 1
the second reflection mirror is arranged in such a way as to enable vertical emergent light on the light-emitting face to be incident to the first reflection mirror after undergoing a total reflection, and the first reflection mirror is arranged in such a way as to enable light reflected by the second reflection mirror to exit after undergoing a total reflection
Implementation Method 2
a plurality of light transmission holes are evenly distributed on the second reflection mirror, whose directions of extension are perpendicular to the light-emitting face
Implementation Method 3
scattered particles are evenly distributed in the second light transmission substrate
Data Source
AI summary
A backlight module, a display panel and a display device. The backlight module includes a first light transmission substrate arranged on a light-emitting face. A projection of the first light transmission substrate on the light-emitting face coincides with the light-emitting face. A first reflection mirror and a second reflection mirror are also arranged on the first light transmission substrate. The first and second reflection mirrors are spaced apart and facing each other, and the second reflection mirror is arranged in such a way as to enable vertical emergent light on the light-emitting face to be incident to the first reflection mirror after undergoing a total reflection. The first reflection mirror is arranged in such a way as to enable light reflected by the second reflection mirror to exit after undergoing a total reflection. A plurality of light transmission holes are evenly distributed on the second reflection mirror.