Display Module Light Guide Plate Optical Path Extension
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Solution Overview
Problem
Conventional photoluminescence QD display products using blue light for excitation pose a risk of eye damage due to the shorter wavelength of blue light easily penetrating display modules and reaching human eyes.
Innovation Solution
A display module design featuring a light guide plate with a blue light source, a display panel comprising quantum dot units and liquid crystal units separated by a transparent barrier and light shielding patterns, where the light propagation direction is changed to increase the optical path of the exciting light, reducing eye damage by minimizing direct exposure of blue light to the quantum dot units and using light shielding barriers to absorb stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If blue light with shorter wavelength is used to excite QD material, then the utilization rate of exciting light is improved, but the risk of eye damage increases due to light penetration
Solution Approach 1:
The patent introduces a light guide plate as an intermediary component between the blue light source and the quantum dot layer. The light guide plate guides the blue light to travel through a longer optical path, allowing effective excitation of quantum dots while the light shielding structures block any directly transmitted blue light from reaching the user's eyes, thus resolving the contradiction between excitation efficiency and eye safety
Solution Approach 2:
The patent converts the harmful short-wavelength blue light into a beneficial excitation source by using light shielding patterns and barriers that redirect and contain the blue light within the display module. The blue light that would otherwise directly harm eyes is instead channeled to excite quantum dots, which then emit safer longer-wavelength light, transforming the harmful short-wavelength light into a useful excitation mechanism
2Object-affected harmful factors
If light shielding barriers are added to block blue light, then eye safety is improved, but the device complexity increases
Solution Approach 1:
The patent divides the light shielding function into multiple segmented components: light shielding patterns on the light guide plate, light shielding barrier walls between display units, and transparent barrier walls separating liquid crystal and quantum dot units. This segmentation allows each component to perform a specific shielding function, achieving comprehensive eye protection while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
The light shielding barrier walls serve multiple functions simultaneously: they block blue light from reaching users' eyes, separate adjacent display units to prevent light leakage, and provide structural support for the quantum dot and liquid crystal units. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity
3Use of energy by moving object
If the optical path of blue light is extended, then the utilization rate of exciting light is improved, but the device complexity increases
Solution Approach 1:
The patent extends the optical path of blue light by utilizing the thickness dimension of the light guide plate. The light guide plate is designed with a specific thickness that allows blue light to travel a longer distance through the plate, increasing the probability of quantum dot excitation without requiring additional lateral optical components, thus extending the optical path in a vertical dimension rather than adding horizontal complexity
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
Improves the utilization rate of exciting light and reduces eye damage by extending the optical path of blue light, ensuring that it effectively excites quantum dot units while minimizing leakage and absorption by the quantum dot units, thereby enhancing display brightness and safety.
Implementation Method 1
a light guide plate, the light guide plate comprising a light entering face and a light exiting face adjacent to each other
Implementation Method 2
Conventional photoluminescence QD display products using blue light for excitation
Implementation Method 3
a light shielding barrier wall which separates adjacent display units
Implementation Method 4
a light propagation direction changing structure, arranged at a side of the liquid crystal unit facing towards the light guide plate, the light propagation direction changing structure is configured to deflect an incoming vertical light
Data Source
AI summary
A display module, a method of manufacturing the same, and a display device are provided. The display module comprises: a light guide plate; a blue light source, disposed at the light entering face of the light guide plate; and a display panel, disposed at a side of the light exiting face of the light guide plate, the display panel comprises a plurality of display units, and adjacent display units are spaced apart with a light shielding barrier wall; each display unit comprises a quantum dot unit and a liquid crystal unit arranged side by side, and the liquid crystal unit and the quantum dot unit are spaced apart with a transparent barrier wall; a side of the liquid crystal unit away from the light guide plate is provided with a first light shielding pattern.