Pixel Electrode Step Correction for Display Color Separation
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Solution Overview
Problem
Current display apparatuses face challenges in effectively separating colors due to inconsistent reflection directions of external light, leading to color separation issues, particularly in pentile arrangements where red and blue light pixels reflect light towards emission areas while green light pixels reflect it away, causing mixing with magenta and green colors.
Innovation Solution
The display apparatus incorporates a step correction layer and conductive lines that adjust the reflection direction of external light by creating steps on pixel electrodes, ensuring that all colors reflect light towards or away from emission areas uniformly, thereby improving color separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flat pixel electrode structure is used, then the device structure is simple, but external light reflects in inconsistent directions causing color separation issues
Solution Approach 1:
The pixel electrode surface is segmented into multiple height levels (first level and second level) corresponding to different sub-pixel regions. This segmentation creates distinct reflection characteristics for different colors, with red and blue sub-pixels having their light reflected toward emission areas while green sub-pixels reflect light away, thereby resolving color separation issues through surface division
Solution Approach 2:
The invention transitions from a two-dimensional flat electrode surface to a three-dimensional stepped surface by introducing height variations. This dimensional change adds a vertical component to the reflection control, enabling different reflection directions for different spatial regions and effectively separating color reflections
2Reliability
If steps are created on pixel electrodes to control light reflection, then color separation is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The step structure is incorporated into the pixel electrode formation process itself, rather than being added as a separate post-processing step. The electrode pattern is designed with built-in height variations that are formed during the standard electrode deposition process, making the step structure an integral part of the electrode fabrication rather than an additional manufacturing complexity
Solution Approach 2:
The stepped pixel electrode structure serves multiple functions simultaneously: it acts as the electrical electrode, defines sub-pixel boundaries, controls light reflection directions, and creates the color separation effect. This multi-functionality eliminates the need for separate structures or processes to achieve each function, simplifying the overall manufacturing approach
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 configuration enhances color separation by ensuring consistent reflection directions for all colors, reducing the occurrence of magenta and green color mixing with red and blue colors, thereby improving display quality.
Implementation Method 1
adjust the reflection direction of external light by creating steps on pixel electrodes, ensuring that all colors reflect light towards or away from emission areas uniformly
Data Source
AI summary
A display apparatus including: a first thin-film transistor and a second thin-film transistor on a substrate, wherein the first thin-film transistor includes a first electrode layer, and the second thin-film transistor includes a second electrode layer; an insulating layer having a first contact hole and a second contact hole respectively exposing the first electrode layer and the second electrode layer; a first pixel electrode connected to the first thin-film transistor through the first contact hole; and a second pixel electrode connected to the second thin-film transistor through the second contact hole. A top surface of the first pixel electrode overlapping the first electrode layer in the first contact hole has a first step facing a first direction, and a top surface of the second pixel electrode overlapping the second electrode layer in the second contact hole has a second step facing a second direction opposite to the first direction.