Display Device Input Sensor Refractive Index Light Efficiency
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Solution Overview
Problem
Current display devices, such as OLEDs, suffer from reduced light efficiency due to light being emitted to the sides rather than the front, leading to wasted light and decreased display performance.
Innovation Solution
A display device design incorporating a display panel with a specific structure including anode electrodes, a pixel defining layer, and an input sensor with distinct refractive indices and organic materials, which minimizes light emission to the sides by using a conductive pattern and insulating layers to direct light emission forward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional OLED display structure is used, then the device is simple in structure, but light efficiency is reduced due to side emission
Solution Approach 1:
The patent introduces an input sensor structure with conductive patterns and insulating layers as an intermediary component between the OLED and the environment. This intermediary structure serves dual purposes: it acts as a touch sensor and simultaneously functions as a light management layer that redirects side-emitted light toward the front, thereby improving light efficiency without significantly complicating the overall device architecture
Solution Approach 2:
The input sensor structure is designed to perform multiple functions simultaneously: touch sensing capability and light redirection/management. By making the sensor structure multi-functional, the patent avoids adding separate components for light management, thus improving light efficiency while minimizing increases in device complexity
2Loss of energy
If light emitting devices emit light in all directions, then the light distribution is uniform, but light loss to the side increases
Solution Approach 1:
The patent changes the optical parameters of the light path by introducing layers with specific refractive indices. The first insulating layer has a first refractive index and the second insulating layer has a second refractive index greater than the first, creating refractive index gradients that bend light rays and redirect side-emitted light toward the front, thereby reducing light loss and increasing front light intensity
3Loss of energy
If the second refractive index is much higher than the first refractive index, then light redirection is more effective, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the refractive index parameters by specifying that the first refractive index ranges from about 1.45 to about 1.55, and the second refractive index ranges from about 1.60 to about 1.70. This controlled parameter range achieves effective light redirection while maintaining manufacturability, as the refractive index difference is sufficient for optical function but not so extreme as to require ultra-precise manufacturing control
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 design enhances light efficiency by reducing light loss and increasing the efficiency of the light-generating process, resulting in improved display performance.
Implementation Method 1
The first insulating layer may include a first organic material and have a first refractive index. The second insulating layer may include a second organic material and have a second refractive index greater than the first refractive index.
Data Source
AI summary
The display device includes a display panel and an input detection member. The input detection member includes a first conductive pattern, a first insulating layer covering the first conductive pattern, a second conductive pattern disposed on the first insulating layer, and a second insulating layer covering the second conductive pattern. Both the first insulating layer and the second insulating layer include an organic material. The refractive index of the second insulating layer is greater than that of the first insulating layer.