Pixel Groove Reflective Layout for Display Crosstalk Reduction
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Solution Overview
Problem
Existing display devices face challenges in reducing or preventing crosstalk caused by light interference between pixels, which degrades image quality.
Innovation Solution
A display device is designed with a first substrate having emission areas and non-emission areas, light-emitting elements above the substrate in the emission areas, a second substrate with grooves corresponding to the emission areas, light conversion layers in the grooves, and reflective layers on the sidewalls of the grooves to surround the light conversion layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light-emitting elements are arranged closely to increase pixel density, then productivity and display resolution are improved, but crosstalk due to light interference between adjacent pixels increases
Solution Approach 1:
The patent divides the light emission space into separate grooves for each pixel, physically segmenting the light paths of adjacent pixels. This segmentation prevents light from one pixel from interfering with adjacent pixels, thereby reducing crosstalk while maintaining high pixel density.
Solution Approach 2:
The patent introduces an intermediary structure (the groove with reflective sidewalls) between adjacent light-emitting elements. This intermediary acts as a light barrier and reflector, redirecting stray light back into the emitting pixel while blocking light from adjacent pixels, thus eliminating crosstalk without reducing pixel density.
2Reliability
If light-blocking structures are added to prevent crosstalk, then image quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the light-blocking function with the existing pixel structure by forming grooves that are integral to the substrate architecture. The groove sidewalls serve dual purposes: defining pixel boundaries and acting as reflective barriers, thereby preventing crosstalk without adding separate complex light-blocking components.
Solution Approach 2:
The patent changes the geometric parameters of the substrate by introducing grooves with specific dimensions and reflective coatings on sidewalls. This parameter modification creates effective light isolation while maintaining a relatively simple overall structure that can be manufactured using standard semiconductor fabrication techniques.
3Object-affected harmful factors
If reflective layers are added to groove sidewalls to reduce crosstalk, then light interference is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The patent performs preliminary action by forming the grooves and applying reflective coatings during the standard fabrication process before final assembly. This preliminary structuring ensures that light isolation is built into the device architecture from the outset, reducing the need for post-fabrication adjustments and simplifying quality control.
Solution Approach 2:
The patent optimizes groove parameters (depth, width, spacing) and reflective layer properties to achieve effective crosstalk reduction with achievable manufacturing tolerances. By carefully selecting these parameters, the design achieves light isolation functionality while remaining compatible with standard manufacturing capabilities.
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 reduces or prevents crosstalk due to light interference between pixels, thereby improving the image quality of the display device.
Implementation Method 1
a second light conversion layer in the second groove, and including first wavelength conversion particles for converting the light of the first color into the light of the second color
Implementation Method 2
a first light conversion layer in the first groove, and containing a light-scattering material
Implementation Method 3
reflective layers on sidewalls of the grooves, and surrounding the light conversion layers in plan view
Data Source
AI summary
A display device according to one or more embodiments includes a first substrate including emission areas, and a non-emission area between the emission areas, light-emitting elements above the first substrate and respectively in the emission areas, a second substrate above the first substrate, and defining grooves corresponding to the emission areas on a surface facing the first substrate, light conversion layers in the grooves above the light-emitting elements, and reflective layers on sidewalls of the grooves, and surrounding the light conversion layers in plan view.