Display Panel White-Pixel Sharing for Higher Aperture Ratio
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in improving aperture ratio due to the requirement of numerous wires for pixel driving, especially when pixels are composed of four colors including red, green, blue, and white, making it difficult to secure an optimal aperture ratio.
Innovation Solution
A display panel design where first and second pixels share a white sub-pixel, with power lines and data lines arranged to minimize overlap with light emission areas, and a repair pattern is introduced to facilitate repair without reducing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each pixel is composed of four colors including red, green, blue, and white with separate wires for each sub-pixel, then color reproduction capability is improved, but the aperture ratio deteriorates due to increased wire density
Solution Approach 1:
Adjacent pixels share common white sub-pixels and power lines. Specifically, the first pixel includes a first white sub-pixel and the second pixel includes a second white sub-pixel, where these white sub-pixels share common power lines (EVDD, EVSS) and control lines. This merging reduces the total number of wires required, thereby improving aperture ratio while maintaining four-color display capability.
2Adaptability or versatility
If more wires are added to drive four-color pixels, then pixel driving capability is improved, but device complexity increases
Solution Approach 1:
Power lines and control lines are designed to serve multiple functions and multiple pixels simultaneously. The EVDD and EVSS power lines supply power to multiple white sub-pixels across adjacent pixels, while control lines manage multiple sub-pixels within each pixel. This multi-functionality reduces the total wire count and simplifies the overall device structure.
3Area of stationary object
If white sub-pixels are continuously arranged to improve aperture ratio, then aperture ratio is improved, but white horizontal or vertical line patterns appear deteriorating display quality
Solution Approach 1:
The display device alternates between displaying with white sub-pixels and displaying without white sub-pixels in periodic time intervals. During periods when white sub-pixels are active, they contribute to brightness; during other periods, they are turned off. This periodic switching prevents the formation of continuous white line patterns while still utilizing the white sub-pixels to improve aperture ratio.
4Ease of repair
If repair patterns are added to facilitate repair processes, then ease of repair is improved, but aperture ratio deteriorates due to additional pattern area
Solution Approach 1:
The repair pattern is designed to overlap with the existing pixel circuit patterns rather than introducing completely new structures. By utilizing the spatial overlap between repair patterns and existing pixel circuits, the additional area required for repair functionality is minimized, thereby reducing the impact on aperture ratio while still providing accessible repair pathways.
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 design enhances aperture ratio, improves display quality by preventing white horizontal or vertical line patterns, and increases luminance and color reproduction rate through efficient pixel driving and repair capabilities.
Implementation Method 1
An organic light-emitting display device may include an organic light-emitting diode (hereinafter, referred to as 'OLED') that emits light by itself
Data Source
AI summary
In a display panel, each of first and second pixels may include a first sub-pixel, a second sub-pixel, and a third sub-pixel having different colors. The first and second pixels may share a white sub-pixel. Each first sub-pixel may include a first pixel circuit and a first light emission area connected to the first pixel circuit. Each second sub-pixel may include a second pixel circuit and a second light emission area connected to the second pixel circuit. Each third sub-pixel may include a third pixel circuit and a third light emission area connected to the third pixel circuit. The white sub-pixel may include a fourth pixel circuit and a fourth light emission area connected to the fourth pixel circuit and may be disposed between the third sub-pixels of the first and second pixels. A display device including a display panel is also disclosed.