Electroluminescent Display Structure With Rear Light-Absorbing Layer
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Solution Overview
Problem
Conventional electro-luminescence display apparatuses face issues with external light reflectance, leading to reduced image quality and difficulty in implementing polarizers in thin, flexible, or foldable displays due to their thickness and inflexibility.
Innovation Solution
An electro-luminescence display apparatus design that includes a transparent substrate, thin-film transistor array, electrodes, and an external light-absorbing layer to absorb visible light, eliminating the need for a polarizing plate and reducing external light reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is attached to the display surface to reduce external light reflection, then external light reflectance is reduced, but the display apparatus becomes thicker and less flexible
Solution Approach 1:
The patent extracts the light-absorbing function from the traditional polarizing plate and implements it separately through a dedicated light-absorbing layer positioned at the rear surface of the display apparatus. This allows the front polarizing plate to be removed or thinned while maintaining external light reflection reduction, thereby reducing overall thickness.
Solution Approach 2:
The patent moves the light-absorbing function from the front surface (where polarizers traditionally are placed) to the rear surface of the display apparatus. By positioning the light-absorbing layer at the rear, the patent achieves external light reflection reduction without adding thickness to the front display surface, enabling thinner and more flexible designs.
2Object-affected harmful factors
If a circular polarizer is attached to the display surface to reduce external light reflection, then external light reflectance is reduced, but the display apparatus becomes less flexible
Solution Approach 1:
The patent extracts the light-absorbing function from the front polarizing plate and implements it separately through a dedicated light-absorbing layer at the rear surface. This separation allows the front display structure to be made flexible and thin while the rear light-absorbing layer handles external light reflection reduction.
Solution Approach 2:
By relocating the light-absorbing function to the rear surface, the patent enables the front display surface to be flexible and adaptable for various form factors including foldable and rollable displays, while still achieving external light reflection reduction through the rear-positioned light-absorbing layer.
3Object-affected harmful factors
If a polarizing plate is used to reduce external light reflectance, then external light reflection is reduced, but luminance is decreased due to light absorption by the polarizer
Solution Approach 1:
The patent segments the light management functions into separate layers: a front polarizing plate for polarization and a rear light-absorbing layer for absorbing external light reflections. This segmentation allows each layer to perform its function more efficiently, with the rear light-absorbing layer preventing reflected light from re-entering the display, thereby improving luminance while maintaining external light reflection reduction.
Solution Approach 2:
By positioning the light-absorbing layer at the rear surface rather than the front, the patent minimizes its impact on outgoing luminance. The rear light-absorbing layer absorbs only reflected external light that returns to the rear surface, while allowing forward-emitted light to pass through unaffected, thus preserving luminance while reducing external light reflectance.
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 design improves image quality by minimizing external light reflectance, enhances luminance, and allows for thinner, more flexible display applications such as rollable and foldable displays.
Implementation Method 1
an external light-absorbing layer on the encapsulation unit... configured to absorb visible light
Implementation Method 2
an electro-luminescence diode on the first electrode... configured to emit first light toward the first electrode and to emit second light toward the second electrode
Data Source
AI summary
An electro-luminescence display apparatus comprises a transparent substrate; a thin-film transistor array disposed on the transparent substrate; a first electrode disposed on the thin-film transistor array; an electro-luminescence diode disposed on the first electrode; a second electrode disposed on the electro-luminescence diode; an encapsulation unit disposed on the second electrode; and an external light-absorbing layer disposed on the encapsulation unit and absorbing external light that passes through the transparent substrate.