Array Point Light Source Display Panel with Optical Coupling
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Solution Overview
Problem
Existing LCD panels using edge-lit backlight modules suffer from uneven display brightness and low energy efficiency, particularly in large-size displays, due to the directional light exit mode which leads to significant light loss and reduced brightness uniformity.
Innovation Solution
A display panel design featuring point light sources arranged in an array on one substrate and optical coupling devices on the other, with a grating layer and liquid crystal layer that adjusts refractive indices to control light exit, allowing for total reflection and improved brightness uniformity by replacing the edge-lit backlight with a waveguide backlight system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If edge-lit backlight module is used, then transparent display effect is achieved, but brightness uniformity deteriorates and energy efficiency deteriorates
Solution Approach 1:
The backlight is segmented into multiple independent point light sources arranged in an array, each capable of emitting light independently. This segmentation allows each light source to be optimally positioned and controlled, eliminating the directional constraints of edge-lit backlights and achieving uniform brightness across the display panel while improving energy efficiency through selective activation of individual light sources.
2Illumination intensity
If edge-lit backlight module is used, then transparent display effect is achieved, but light loss increases
Solution Approach 1:
Optical coupling devices are introduced as intermediary elements between the point light sources and the display panel. These optical coupling devices efficiently transmit and direct light from the point light sources through the substrate, minimizing light loss at interfaces and improving overall light intensity while maintaining the transparent display effect.
3Illumination intensity
If point light sources in array are used, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The optical coupling devices are merged with the substrate structure, and the point light sources are integrated into the array configuration directly on the substrate. This merging reduces the number of separate components and simplifies the overall device structure while maintaining the brightness uniformity achieved through the array configuration.
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 solution enhances brightness uniformity and reduces power consumption by using an array of point light sources and optical coupling devices, achieving a transparent display effect with improved light intensity and reduced material costs, applicable to large-size displays and fields like projection and AR/VR.
Implementation Method 1
the optical coupling devices being arranged to reflect lights emitted by the corresponding point light sources, penetrating the first substrate, and reaching the optical coupling devices, into the first substrate
Implementation Method 2
the display panel is arranged to open or close a grating in the grating layer by adjusting a refractive index of liquid crystal to enable the lights in the first substrate to exit from an open grating in the grating layer
Data Source
AI summary
Provided are a display panel, a display apparatus, a driving method of the display panel, and a computer readable storage medium. The display panel includes: a first substrate and a second substrate being arranged in box alignment, point light sources in an array arrangement being arranged on a side of the first substrate away from the second substrate, optical coupling devices corresponding to the point light sources one by one being arranged on a side of the first substrate close to the second substrate, a grating layer being arranged on a side of the optical coupling devices away from the first substrate, a liquid crystal layer being arranged between the first substrate and the second substrate; and the optical coupling devices being arranged to reflect lights emitted by the corresponding point light sources, penetrating the first substrate, and reaching the optical coupling devices, into the first substrate.