OLED Display Panel Microcavity Light Transmittance
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Solution Overview
Problem
Conventional OLED screens have poor light transmittance, which hinders the achievement of true full screens and reduces the sensitivity of sensing elements like fingerprint scanners and facial recognition systems.
Innovation Solution
A display panel structure is designed with a specific configuration including an anode layer, a functional layer with multiple light-emitting and reflective layers, and a cathode layer, forming a microcavity that enhances light transmittance and sensitivity of sensing elements hidden behind the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional OLED screen structure is used, then manufacturing is simpler, but light transmittance is poor
Solution Approach 1:
The light-emitting layer is divided into three separate layers (first, second, and third light-emitting layers) with different thicknesses, allowing each layer to contribute differently to light emission and transmission. This segmentation enables optimized light transmittance while maintaining manageable structural complexity
Solution Approach 2:
Different regions of the screen have different structural configurations. The pixel definition layer creates through holes in specific locations, and the light-emitting and reflective layers are selectively disposed in these through holes, creating local variations in light transmission properties that improve overall light transmittance
2Area of stationary object
If sensing elements are placed on the front of the screen, then sensing function is available, but screen-to-body ratio is reduced due to cut irregular-shaped screens
Solution Approach 1:
Instead of placing sensing elements on the front of the screen, the invention inverts the arrangement by placing sensing elements on the back of the screen. The improved light transmittance from the enhanced OLED structure allows the sensing elements to function effectively through the screen from the rear position, achieving full-screen appearance while maintaining sensing capability
Solution Approach 2:
The invention changes the key parameter of light transmittance by implementing a multi-layer light-emitting structure with varying thicknesses and a reflective layer. This parameter change enables the screen to transmit sufficient light for rear-placed sensing elements to detect touch and other inputs effectively
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 increased light transmittance and sensitivity of the display panel improve the sensing effect, allowing for a true full screen experience by optimizing the light emission and reflection properties.
Implementation Method 1
a microcavity formed between the reflective layer and the anode layer, such that the light having specific wavelength may be emitted to the outside of the display panel
Implementation Method 2
there is a microcavity formed between the reflective layer and the anode layer, such that the light having specific wavelength may be emitted to the outside of the display panel
Data Source
AI summary
A display panel including an anode layer, a functional layer, a cathode layer, and a packaging layer is provided, in which the functional layer includes a hole transport layer, a light-emitting layer, a reflective layer, and an electron transport layer. The display panel has an advantage in increasing light transmittance.