Backlight Module Microprism Film Light Source Darkness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inverse prism pointed backlight modules often exhibit darkness near the light source side due to reduced light emission, especially in small-sized designs, limiting their effectiveness in applications like vehicle and VR displays.
Innovation Solution
A backlight module incorporating a light source, a light guide plate with dots on its backlight side, and a microprism film layer with first microprism structures that increase the incident angle over the emitting angle, reducing the optical path and light delay without altering the brightness viewing angle or light emitting angle, and ensuring the refractive index of the microprism film matches that of the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inverse prism pointed backlight module is used, then light emitting angle adjustability is improved, but darkness occurs near the light source side
Solution Approach 1:
The patent applies local quality by placing microprism structures at specific locations on the light guide plate - specifically on the light emitting side within a preset distance from the light source. These microprisms have different geometric parameters (height, base angle) tailored to local light distribution needs, creating non-uniform local optical properties that compensate for the darkness near the light source while maintaining the overall pointed backlight effect.
Solution Approach 2:
The patent changes optical parameters by introducing microprism structures with specific geometric parameters (height h ranging from 1-10 times the light guide plate thickness, base angles between 10-45 degrees). These parameter changes alter the light propagation characteristics, causing light to exit at larger angles and redistribute brightness uniformly across the display area while preserving the light emitting angle adjustability of the inverse prism system.
2Illumination intensity
If microprism film layer is added to reduce optical path, then light distribution is improved, but device complexity increases
Solution Approach 1:
The patent merges the microprism film layer with the light guide plate by making them integrally formed from the same material with matching refractive indices. This integration eliminates the need for separate assembly steps and interfaces between distinct components, reducing manufacturing complexity while maintaining the optical functions of both the light guide plate and microprism structures.
Solution Approach 2:
The patent uses composite material approach by creating an integrated structure where the light guide plate and microprism film layer are formed as a unified piece with consistent material properties. This composite structure combines the light guiding function of the plate with the light redirecting function of the microprisms, achieving improved light distribution without adding structural complexity through multiple separate 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
Effectively improves light distribution by reducing darkness near the light source side while maintaining the brightness viewing angle and light emitting angle, enhancing performance in displays without increasing module thickness or complexity.
Implementation Method 1
the microprism film layer includes a plurality of first microprism structures, the first microprism structures are configured to make an incident angle of light at a first interface when entering the first microprism structures greater than an emitting angle of the light at the first interface when exiting from the first microprism structures
Implementation Method 2
the light emitted by the light source is incident into the light guide plate in a side-entry mode; the light guide plate is provided with a plurality of dots on a backlight side thereof
Data Source
AI summary
The present disclosure discloses a backlight module and a display apparatus. A microprism film layer is further arranged on a light emitting side of a light guide plate, and the microprism film layer is located in a range of a preset distance by which the light guide plate extends from a side close to a light source to a side away from the light source; and the microprism film layer includes a plurality of first microprism structures, and the first microprism structures are configured to make an incident angle of light at a first interface when entering the first microprism structures greater than an emitting angle of the light at the first interface when exiting from the first microprism structures when the light in the light guide plate enters the first microprism structures from the light guide plate and then enters the light guide plate from the first microprism structures.