Backlight Wavelength Selection Layer for Mini LED Luminance
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Solution Overview
Problem
Mini LED-based backlights suffer from high light loss due to complex optical designs and low reflectivity of LED base substrates, resulting in lower luminance compared to traditional edge-type backlights, despite having larger chip volumes and higher central luminance.
Innovation Solution
Incorporating a wavelength selection layer that transmits the first wavelength and reflects the second wavelength, combined with a wavelength conversion layer that emits light under excitation, and a prism layer to collimate light, along with a reflective layer with openings matching the light source, to minimize light loss and enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a complex optical design is used in mini LED-based backlights, then light extraction can be improved, but light loss increases and luminance decreases
Solution Approach 1:
A wavelength selection layer is introduced as an intermediary component between the light source and the output. This layer selectively transmits light of a first wavelength while reflecting light of a second wavelength, acting as a mediator to control light paths and reduce light loss in the backlight system.
Solution Approach 2:
The patent changes the optical parameters by introducing a wavelength selection layer with specific optical characteristics (transmitting first wavelength, reflecting second wavelength). This parameter change enables better light control and reduces light loss without requiring complex optical designs.
2Illumination intensity
If the LED base substrate has low reflectivity, then manufacturing is simpler, but light loss increases and luminance decreases
Solution Approach 1:
The wavelength selection layer serves as an intermediary that compensates for the low reflectivity of the base substrate. By selectively transmitting and reflecting specific wavelengths, it enhances light extraction efficiency without requiring the base substrate to have high reflectivity, thus maintaining manufacturing simplicity.
Solution Approach 2:
The patent changes the optical parameter distribution by introducing a wavelength selection layer with specific transmission and reflection characteristics. This allows the system to achieve better light extraction despite the base substrate having low reflectivity, maintaining ease of manufacture.
3Illumination intensity
If mini LEDs with larger chip volumes are used, then central luminance increases, but overall light loss increases due to complex optical designs
Solution Approach 1:
The wavelength selection layer acts as a mediator that works effectively with mini LEDs of various chip volumes. By selectively managing light wavelengths, it enables mini LEDs with larger chip volumes to achieve higher central luminance while reducing overall light loss through controlled light transmission and reflection.
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
Significantly increases the luminance of the backlight by reducing light loss through the wavelength selection and conversion process, while maintaining cost-effectiveness and manufacturing simplicity.
Implementation Method 1
a wavelength conversion layer on a side of the wavelength selection layer away from the base substrate. The wavelength conversion layer is configured to emit light having a second wavelength under excitation of the light having the first wavelength
Implementation Method 2
The wavelength selection layer is configured to transmit the light having the first wavelength through the wavelength selection layer and reflect the light having the second wavelength
Implementation Method 3
The wavelength selection layer is configured to transmit the light having the first wavelength through the wavelength selection layer and reflect the light having the second wavelength
Implementation Method 4
a first prism layer on a side of the wavelength conversion layer away from the base substrate and configured to collimate light entering the first prism layer
Data Source
AI summary
The present application provides a backlight, a method for manufacturing a backlight, and a display apparatus. The backlight includes at least one lamp plate having a base substrate and a light source on the base substrate, the light source being configured to emit light having a first wavelength; a wavelength selection layer on a side of the light source away from the base substrate; and a wavelength conversion layer on a side of the wavelength selection layer away from the base substrate. The wavelength conversion layer is configured to emit light having a second wavelength under excitation of the light having the first wavelength. The wavelength selection layer is configured to transmit the light having the first wavelength through the wavelength selection layer and reflect the light having the second wavelength.