Single-Side Light-Emitting Source for High-Contrast Displays
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Solution Overview
Problem
Reflective display apparatuses have low contrast in dark environments and are not compatible with touch panels due to the limitations of edge light-guide plates, which are prone to damage and have low contrast when emitting light from both sides.
Innovation Solution
A single-side light-emitting source is developed, comprising a base substrate with light-shielding patterns, signal transmission patterns, electrodes, an electroluminescent layer, and a transparent second electrode layer, which emits light only from one side, increasing contrast in dark environments and allowing compatibility with touch panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an edge light-guide plate is used in a reflective display apparatus, then the display can be illuminated, but the contrast in dark environment is low because light is emitted from both sides
Solution Approach 1:
The light-emitting structure is segmented into multiple independent light-emitting units arranged in an array, where each unit emits light only from one side (the side facing the reflective display panel), thereby eliminating light emission from the opposite side and improving contrast in dark environments
Solution Approach 2:
Instead of using a traditional edge light-guide plate that emits light from both sides, the invention inverts the approach by using a substrate with light-emitting units that emit light only from one side (the side facing the display panel), with the opposite side being light-shielding
2Illumination intensity
If an edge light-guide plate is arranged above the reflective display apparatus, then front light illumination is achieved, but the structure is complex and the light-guide plate is prone to damage
Solution Approach 1:
The light-emitting units are integrated directly onto the substrate that serves as the base for the reflective display apparatus, merging the illumination function with the structural base, thereby simplifying the overall structure and reducing the number of separate components
Solution Approach 2:
The substrate serves multiple functions: it provides structural support for the display apparatus, acts as a base for mounting light-emitting units, and functions as a light-shielding layer on its non-light-emitting side, eliminating the need for separate light-guide plates
3Illumination intensity
If an edge light-guide plate is used, then illumination is provided, but it is incompatible with touch panels due to structural interference
Solution Approach 1:
The light-emitting units are arranged in a planar array on the substrate surface, utilizing the two-dimensional plane rather than requiring three-dimensional edge positioning, thereby allowing seamless integration with touch panels without structural interference
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 single-side light-emitting source enhances display contrast in dark environments by emitting light only from one side, while being compatible with touch panels and offering a simple, cost-effective manufacturing process.
Implementation Method 1
an electroluminescent layer on the plurality of first electrodes
Data Source
AI summary
A single-side light-emitting source, a method for manufacturing the same, and a display device are provided. The single-side light-emitting source includes a base substrate; a plurality of light-shielding patterns on the base substrate; a signal transmission pattern covering the plurality of light-shielding patterns; a plurality of first electrodes; an electroluminescent layer on the first electrodes; and a transparent second electrode layer on the electroluminescent layer. In the above single-side light-emitting source, the first electrodes are on the signal transmission pattern, and an orthographic projection of each first electrode onto the base substrate is within an orthographic projection of a corresponding light-shielding pattern onto the base substrate.