Vehicle Display Encapsulation With Light-Blocking Air Cavities
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Solution Overview
Problem
Existing display devices in vehicles emit light that can interfere with the driver's view by reflecting off the front glass at night, and there is a need to block moisture and air ingress while improving touch sensing performance.
Innovation Solution
A light emitting display device with a substrate, light emitting layer, and encapsulation layer that includes a lower inorganic encapsulation layer, an organic encapsulation layer with light blocking structures, and an upper inorganic encapsulation layer, featuring a barrier layer, capping layer, and air-filled space to control light emission direction and enhance moisture and air barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light blocking structures are added to control light emission direction, then light emission control is improved, but device complexity increases
Solution Approach 1:
The encapsulation layer is segmented into multiple functional components: lower inorganic encapsulation layer, organic encapsulation layer with light blocking structures, and upper inorganic encapsulation layer. This segmentation allows each layer to perform its specific function (protection, light blocking, protection) while collectively solving the light emission control problem without requiring complete redesign of the entire display structure.
Solution Approach 2:
The light blocking structures are nested within the organic encapsulation layer, which itself is nested between the lower and upper inorganic encapsulation layers. This nested configuration integrates the light blocking function into the existing encapsulation structure, adding functionality without significantly increasing overall device complexity or requiring separate external components.
2Reliability
If organic encapsulation layer with light blocking structures is used, then moisture and air barrier properties are improved, but manufacturing process complexity increases
Solution Approach 1:
The encapsulation structure uses composite materials combining inorganic layers (for moisture and air barrier properties) with an organic layer containing light blocking structures (for light emission control). This composite approach allows simultaneous achievement of protection against environmental factors and control of light emission, with each material contributing its advantageous properties to the overall system performance.
3Object-affected harmful factors
If light blocking structures are implemented, then driver's view is protected from reflection, but touch sensing performance may be affected
Solution Approach 1:
The light blocking structures are positioned specifically within the organic encapsulation layer at locations optimized to block reflected light from reaching the driver while maintaining touch sensing functionality. The inorganic encapsulation layers are strategically placed to provide protection without interfering with the touch sensing layer's electrical properties, ensuring local optimization of both light blocking and touch sensing performance.
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 effectively blocks light emission in specific directions, prevents reflection on the vehicle's front glass, reduces moisture and air ingress, and enhances touch sensing performance by lowering the dielectric constant and reducing noise.
Implementation Method 1
The barrier layer may include one of TiO2, Al2O3, SiO2, and Fe2O3 and has low-reflection characteristics
Implementation Method 2
enhances the sensing performance of the touch sensing layer located on the encapsulation layer... enhances touch sensing performance by lowering the dielectric constant and reducing noise
Data Source
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AI summary
According to embodiments, a light emitting display device includes a substrate, a light emitting layer disposed on the substrate, and an encapsulation layer that covers the light emitting layer and includes a lower inorganic encapsulation layer and an organic encapsulation layer. The organic encapsulation layer includes a plurality of light blocking structures extending longitudinally in one direction in an area overlapping the light emitting layer. Each of the plurality of light blocking structures includes a barrier layer, a capping layer, and a space filled by an air and surrounded by the barrier layer and the capping layer.