Emissive Display With Light-Emitting Combination Layer
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Solution Overview
Problem
Conventional OLED displays suffer from low luminous efficiency and require a backlight module for image display, which increases size and weight, and lacks uniform light distribution.
Innovation Solution
A display with a light-emitting combination layer comprising a light emitting material and a liquid crystal material, which generates a horizontal or vertical electric field when a voltage is applied, eliminating the need for a traditional backlight unit and enhancing luminous efficiency and uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional OLED is used for light emission, then light emission in response to electric current is achieved, but luminous efficiency is low
Solution Approach 1:
The patent uses a composite light-emitting layer containing both electroluminescent material and liquid crystal material. The electroluminescent material converts electrical energy to light, while the liquid crystal material enhances light emission through its optical properties, creating a synergistic effect that improves overall luminous efficiency compared to conventional OLED alone
Solution Approach 2:
The patent modifies the optical parameters of the light-emitting layer by incorporating liquid crystal material with specific optical anisotropy and phase transition properties. This changes the light emission characteristics and improves luminous efficiency by optimizing the interaction between electrical energy conversion and light output
2Illumination intensity
If backlight module is added for image display, then light source is provided, but size and weight increase
Solution Approach 1:
The patent merges the light emission function directly into the display panel structure by using the electroluminescent liquid crystal composite layer as the active light source. This eliminates the need for a separate backlight module, thereby reducing both size and weight while maintaining image display capability
Solution Approach 2:
The display panel becomes self-sufficient in light generation through the electroluminescent liquid crystal composite layer that converts electrical energy directly to light within the panel structure. This self-service light emission eliminates dependence on external backlight modules, reducing overall system weight and complexity
3Illumination intensity
If backlight module is added for image display, then light source is provided, but light distribution uniformity is poor
Solution Approach 1:
The patent applies local quality enhancement by using the liquid crystal material's optical properties to uniformly distribute light at the molecular level within the light-emitting layer. The liquid crystal molecules orient themselves to create uniform light emission characteristics across the display area, improving light distribution uniformity
Solution Approach 2:
The composite structure of electroluminescent material and liquid crystal material creates synergistic light emission and distribution properties. The liquid crystal component ensures uniform light distribution while the electroluminescent material provides the light source, achieving both functions within a single layer
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 significantly improves luminous efficiency and achieves uniform light distribution without the need for a backlight unit, making the display more compact, lightweight, and energy-efficient.
Implementation Method 1
a light emitting combination layer which comprises a light emitting material and a liquid crystal material, thereby forming an emissive display
Implementation Method 2
a horizontal or vertical electric field can be generated when a voltage is applied to that electrode structure
Implementation Method 3
a light-emitting combination (LEC) layer positioned between the first and second substrates. The LEC layer comprises a light emitting material and a LC material
Data Source
AI summary
A display comprises a first substrate, a second substrate opposite to the first substrate, an electrode structure, and a light-emitting combination (LEC) layer positioned between the first and second substrates, wherein the LEC layer comprises a light emitting material and a LC material, and a horizontal or vertical electric field is generated when a voltage is applied to that electrode structure. One of exemplified displays has an electrode structure comprising a first electrode and a second electrode oppositely disposed, and the LEC layer is positioned between the first and second electrodes, wherein a vertical electric field is generated when a voltage is applied. The device can further comprise an electron injection layer and a hole transport layer. Another exemplified display has an electrode structure arranged on one side of the first substrate, and a horizontal electric field is generated when a voltage is applied.