Backlight Module Notch Light Compensation via Transparent Frame
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Solution Overview
Problem
Conventional backlight modules with notches in liquid crystal display devices require auxiliary light sources and control circuits, leading to increased complexity and cost due to the need for light shielding and separate control circuits, resulting in a larger notch size and wider frames.
Innovation Solution
A backlight module design that uses a transparent plastic frame with light incident and emitting sections to redirect light from the main source, eliminating the need for an auxiliary light source and control circuit by compensating for uneven light distribution around notches, thereby reducing frame size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an auxiliary light source is provided at the notch to ensure even brightness, then brightness uniformity is improved, but device complexity and cost increase due to additional control circuits
Solution Approach 1:
The patent introduces a light guide structure as an intermediary element that redirects light from the main light source to the notch region. This light guide acts as a mediator that distributes light uniformly without requiring additional light sources or control circuits, thereby maintaining brightness uniformity while avoiding increased device complexity
Solution Approach 2:
The main light source is designed to serve multiple functions: it provides illumination for both the main display area and the notch region. By making the light source universal, the patent eliminates the need for separate auxiliary light sources and their associated control circuits, thus reducing device complexity while maintaining brightness uniformity across all regions
2Illumination intensity
If a light shielding region is provided to shield the auxiliary light source, then light distribution is improved, but the display region decreases and the frame becomes wider
Solution Approach 1:
The light guide serves as an intermediary that redirects light around the notch region without requiring light shielding structures. By using optical redirection instead of shielding, the patent maintains effective light distribution while preserving the display region and avoiding increased frame width
Solution Approach 2:
The patent employs a light guide that operates in a different spatial dimension or path to deliver light to the notch region. This dimensional approach allows light to reach the notch area without requiring lateral expansion of the frame or reduction of the display region, thus maintaining light distribution quality while preserving display area
3Illumination intensity
If separate control circuits are provided for the auxiliary light source, then brightness control is improved, but manufacturing cost increases
Solution Approach 1:
The main light source and its control circuit are designed to serve multiple functions, including controlling illumination for both the main display area and the notch region. By making the control system universal, the patent eliminates the need for separate control circuits, thereby reducing manufacturing cost while maintaining brightness control capability
Solution Approach 2:
The patent merges the control functions for the main light source and the notch region illumination into a single control circuit. By combining these control functions, the patent reduces the number of separate control circuits needed, thus lowering manufacturing cost while preserving the ability to control brightness in different regions
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 design enhances even brightness distribution around notches without additional light sources or control circuits, reducing the notch size, saving space and cost, and simplifying the main board circuit, while maintaining effective light transmission and compensation.
Implementation Method 1
The first portion of the plastic frame is made of a light transmissive material, and a reflection layer is provided on an outer surface of the first portion of the plastic frame
Implementation Method 2
a reflection layer is provided on an outer surface of the first portion of the plastic frame
Data Source
AI summary
A backlight module is disclosed, which includes a light source; a light guide plate disposed on the light source. The light guide plate has a bottom surface receiving light from the light source and a front surface emitting light, and the front surface is perpendicular to the bottom surface. The light guide plate has a first notch placed on a top corner; and a plastic frame circumventing the light source and the light guide plate. The plastic frame comprises a portion starting from a frame light incident section near the light source and ending at a first frame light emitting section near the first notch, and the portion is light transparent to pass light from the light source, and has a reflective coating.