Light Guide Plate with Phosphor Grid Dots for Uniform Illumination
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Solution Overview
Problem
Bi-stable liquid crystal display screens cannot display effectively in dark environments without an external light source due to their inherent limitations, leading to inhomogeneous illumination and unsatisfactory display effects.
Innovation Solution
A light guide plate with phosphor grid dots and a reflection layer is used to uniformly project excitation light onto the display surface, ensuring consistent illumination and improving display quality in low-light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an LED light source is disposed at the periphery of the display screen for illumination, then the display screen can be used in dark environments, but inhomogeneous illumination and bright spots are formed
Solution Approach 1:
The patent segments the illumination function by separating the light source (LED at periphery) from the light emission area (front surface of display). The light guide plate divides and redistributes the light from the peripheral LED source across the entire front surface, transforming a single-point illumination into distributed multi-point illumination, thereby achieving uniform lighting without direct LED visibility
Solution Approach 2:
The light guide plate serves as an intermediary component between the peripheral LED light source and the display screen. It receives light from the LED, guides and distributes it uniformly across the front surface, and presents homogeneous illumination to the viewer while keeping the actual light source hidden at the periphery, thus resolving the contradiction between illumination capability and uniformity
2Adaptability or versatility
If a peripheral LED light source is used to illuminate the display screen, then dark environment display is enabled, but the display effect becomes unsatisfactory due to bright spots
Solution Approach 1:
The illumination system is segmented into three functional parts: light generation (peripheral LED), light guidance and distribution (light guide plate with internal structures), and light presentation (front surface emission). This segmentation allows the light source to be positioned away from the display area while maintaining high display quality through uniform front-surface illumination without visible bright spots
Solution Approach 2:
The light guide plate acts as an intermediary that decouples the light source position from the light emission position. It receives concentrated light from the peripheral LED and transforms it into distributed uniform illumination across the front surface, thereby enabling dark environment operation while maintaining satisfactory display quality without direct LED visibility
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 achieves uniform illumination and enhances display effectiveness by mixing excitation light into white light, preventing the display screen from being affected by environmental light and improving visibility in dark environments.
Implementation Method 1
The phosphor grid dots are capable of generating excitation light after being excited by light from a light source
Implementation Method 2
The reflection layer is configured to reflect the excitation light of the phosphor grid dots to the light guide plate body
Data Source
AI summary
A light guide plate comprises a light guide plate body having a first light emitting surface, a second light emitting surface which is opposite to the first light emitting surface, and a plurality of side surfaces which connect the first light emitting surface and the second light emitting surface. The light guide plate further comprises a plurality of phosphor grid dots arranged on the first light emitting surface and a reflection layer arranged on each of the phosphor grid dots. The phosphor grid dots are capable of generating excitation light after being irradiated by light from a light source. The reflection layer is configured to reflect the excitation light of the phosphor grid dots to the light guide plate body. Embodiments of the present disclosure also provide a front light source module, a display module and a display device.