Flat Panel Display Lens Sheet for Brightness and Sharpness
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Solution Overview
Problem
Conventional flat panel displays with self-luminant devices face low light coupling efficiency due to total reflection at the interface between high refractive index substrates and air, leading to reduced brightness and image sharpness, with existing solutions either increasing battery weight or degrading image quality.
Innovation Solution
A flat panel display design incorporating a plurality of self-luminant devices with a lens sheet featuring condensing lenses that direct light towards a predetermined direction, with the distance from the light emitting layer to the exterior portion of the condensing lens controlled to prevent image overlap and enhance light coupling efficiency and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If micro lenses are formed on the exterior surface of the substrate to condense light, then light coupling efficiency and brightness are improved, but image sharpness is degraded due to image overlap from adjacent EL devices
Solution Approach 1:
The patent moves the condensing lenses from the exterior surface of the substrate to the interior of the substrate, changing the spatial dimension where the optical function is performed. This internal positioning allows light to be condensed before it exits the substrate, preventing the spread and overlap that occurs when lenses are on the exterior surface, thereby maintaining image sharpness while still improving brightness.
Solution Approach 2:
The condensing lenses are embedded within the substrate structure itself, nesting the optical function inside the existing substrate. This integration allows the substrate to serve dual purposes: as the structural base and as the medium containing the light-condensing elements, eliminating the need for separate exterior lens components that would contribute to image overlap.
2Illumination intensity
If voltage is increased to improve brightness, then illumination intensity is improved, but device weight increases and battery life span decreases
Solution Approach 1:
The patent changes the optical parameters of the system by introducing condensing lenses with specific refractive indices and focal lengths. This optical parameter modification allows light to be concentrated more efficiently, increasing brightness without requiring increased electrical power input, thereby avoiding the need for larger batteries and reduced device weight.
3Loss of energy
If condensing lenses are formed between the lower electrode and substrate surface, then light coupling efficiency is improved, but image sharpness is degraded due to image overlap from adjacent EL devices
Solution Approach 1:
The patent repositions the condensing lenses from the exterior surface region to the interior volume of the substrate, changing the spatial arrangement. This internal positioning ensures that light condensation occurs within the substrate matrix, which naturally confines and directs the light paths, preventing the lateral spread that causes adjacent pixel image overlap while still achieving improved light coupling efficiency.
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 improves light coupling efficiency and brightness without sacrificing image sharpness, reducing power consumption and extending the life span of the self-luminant device, while simplifying manufacturing processes by integrating the lens sheet with the substrate or sealing substrate.
Implementation Method 1
A flat panel display design incorporating a plurality of self-luminant devices with a lens sheet featuring condensing lenses that direct light towards a predetermined direction
Implementation Method 2
One portion of the display that lowers the light coupling efficiency is at the interface of a transparent substrate having high refractive index and air having low refractive index. At such an interface, total reflection can occur when the incident angle of light is greater than the critical angle
Data Source
AI summary
A flat panel display device. The device includes a plurality of self-luminant devices, each of which includes at least a light emitting layer, formed on every pixel, and a lens sheet having a plurality of condensing lenses that correspond to the self-luminant devices and direct the light emitted from the self-luminant devices toward a predetermined direction. A distance between the light emitting layer and an exterior portion of the condensing lens in the direction of propagation of the light is between 50 and 500 microns so as not to overlap images of neighboring sub-pixels, that are expanded by the condensing lenses. Therefore, a lowering of image sharpness that is caused by the condensing lenses can be prevented, while a light coupling efficiency and a brightness are improved.