Core-Shell Particle Touch Protective Film for Display Luminance
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Solution Overview
Problem
The integration of a touch sensor in display devices, such as OLEDs, leads to light loss and reduced luminance due to the emission path being obstructed, limiting the improvement in display quality and increasing power consumption.
Innovation Solution
A display panel design featuring a touch sensor with a touch protective film containing core-shell structured particles, where the core is a metal oxide and the shell is a molecular sieve, such as MCM-41 or SBA-15, enhancing light transmittance and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch sensor is disposed above the encapsulating film to enable touch sensing function, then touch sensing capability is improved, but light loss occurs and luminance is lowered
Solution Approach 1:
The touch protective film incorporates porous particles (such as TiO2, SiO2, or ZrO2) that create light scattering centers within the film structure. These porous materials allow light to pass through while scattering it in multiple directions, which compensates for the light loss caused by the touch sensor and improves overall light transmission and luminance.
Solution Approach 2:
The touch protective film is formulated as a composite material containing resin and dispersed porous particles. This composite structure combines the protective and touch-sensitive properties of the base film with the light-scattering enhancement provided by the porous particles, achieving both touch sensing functionality and improved light transmission.
2Reliability
If a touch protective film is added to cover the touch sensor for protection, then durability and protection are improved, but light transmittance may be reduced
Solution Approach 1:
The protective film utilizes porous particles embedded in the resin matrix to create light scattering centers. These porous structures scatter light effectively while maintaining high light transmission, thus the film provides both protection and excellent light transmittance properties without significantly reducing luminance.
Solution Approach 2:
The refractive index of the porous particles (TiO2: 2.6-2.9, SiO2: 1.46, ZrO2: 2.2-2.6) is strategically selected to be higher than that of the resin (1.4-1.6), creating optimal light scattering conditions. This parameter optimization ensures maximum light scattering efficiency while maintaining high light transmission through the protective film.
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 minimizes luminance degradation and improves display quality while reducing power consumption by enhancing light extraction efficiency through the use of core-shell structured particles in the touch protective film.
Implementation Method 1
the touch protective film comprises a material containing core-shell structured particles dispersed therein... Each of the core-shell structured particles includes a core comprising a metal oxide and a shell comprising a molecular sieve... the light can pass through pores in the molecular sieve such that the linearity of the light is enhanced
Implementation Method 2
the shell comprises a molecular sieve and surrounding the core... since the molecular sieve has a hexagonal columnar structure, the light can pass through pores in the molecular sieve
Implementation Method 3
the core comprises a metal oxide having a relatively high refractive index, the light transmittance of the touch protective film can be improved
Data Source
AI summary
A display panel comprises a light-emission elements array including a plurality of light-emission elements which corresponds to a plurality of pixel regions arranged in a display region; an encapsulating film covering the light-emission elements array; a touch sensor disposed over the encapsulating film; and a touch protective film covering the touch sensor, wherein the touch protective film includes a material containing core-shell structured particles.