Four-Subpixel Display Device White Sub-Pixel Color Filter Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with a color filter on array (COA) structure using red, green, and blue sub-pixels suffer from low light efficiency and brightness due to color filter debris remaining in the white sub-pixel region, causing color mixture and reduced light transmissivity.
Innovation Solution
A display device with a four sub-pixel structure where a color filter is not disposed in the fourth sub-pixel, and a method involving the formation of thin film transistors, color filters, and pixel electrodes on a substrate, with a planarization layer and isolating wall to prevent color mixture by exposing the white sub-pixel region directly to the gate insulating layer, thereby improving light transmissivity and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter is disposed in the white sub-pixel region, then color filtering is provided, but color filter debris remains causing color mixture and reduced light transmissivity
Solution Approach 1:
The invention extracts the color filter from the white sub-pixel region entirely. The fourth sub-pixel (white sub-pixel) does not have a color filter disposed in it, unlike the first three sub-pixels which have red, green, and blue color filters respectively. This extraction eliminates the source of color filter debris that would otherwise contaminate the white sub-pixel region and cause color mixture, thereby maintaining high light transmissivity and brightness.
Solution Approach 2:
The invention applies different structural configurations to different sub-pixels within the same pixel unit. Specifically, the first three sub-pixels have color filters while the fourth sub-pixel does not. This local differentiation allows the white sub-pixel to maintain its high light transmissivity property without being compromised by color filter debris, as the color filters are only present in regions where they are needed for color selection.
2Use of energy by moving object
If four sub-pixels are used to improve light efficiency, then brightness is improved, but color filter debris causes color mixture reducing light transmissivity
Solution Approach 1:
The invention extracts the color filter from the white sub-pixel region to eliminate the source of contamination. By not disposing a color filter in the fourth sub-pixel, the invention prevents color filter debris from entering the white sub-pixel region, thereby maintaining reliable light transmissivity while still achieving high light efficiency through the four-sub-pixel structure.
Solution Approach 2:
The invention implements local quality differentiation where the first three sub-pixels have color filters for color selection while the fourth sub-pixel lacks a color filter to maintain pure white light transmission. This localized structural difference ensures that the white sub-pixel maintains its light transmissivity reliability without being affected by color filter debris, while the overall four-sub-pixel structure achieves high light efficiency.
Data Source
AI summary
The present invention provides a display panel of a flat panel display device of a four-color structure in which color mixture may not occur in a white sub-pixel and a method for fabricating the same. The display device includes first, second, third, and fourth sub-pixels, and each sub-pixel includes a thin film transistor. A color filter is formed adjacent to the thin film transistor of each of the first, second, and third sub-pixels, a planarization layer is formed on the color filters, and a pixel electrode is connected to each thin film transistor.