Shared Pixel Circuit for OLED Aperture Ratio and Color Breakup
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Solution Overview
Problem
The aperture ratio of organic light emitting displays is compromised due to the need for multiple pixel circuits and the connection of one emission control line to each pixel row, leading to inefficient light emission and potential color breakup.
Innovation Solution
A pixel circuit design where multiple OLEDs (red, green, and blue) are connected to a single driving circuit, allowing sequential control of their emission, reducing the number of pixel circuits required and minimizing color breakup by sharing data lines and emission control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If one emission control line is connected to each pixel row, then each pixel can be controlled independently, but the aperture ratio of the organic light emitting display deteriorates
Solution Approach 1:
The patent merges multiple pixel circuits into a single shared circuit that controls multiple OLEDs (red, green, and blue) within the same pixel. By combining the control functions for multiple color sub-pixels into one circuit and using a single emission control line per row, the design reduces the number of required control lines and pixel circuits, thereby increasing the aperture ratio while maintaining independent control capability through sequential activation of different color OLEDs.
2Ease of operation
If an OLED is connected to each pixel circuit, then light emission can be controlled per pixel, but a plurality of pixel circuits are necessary which reduces the aperture ratio
Solution Approach 1:
The patent implements a universal pixel circuit design where a single pixel circuit serves multiple functions by controlling multiple OLEDs of different colors (red, green, blue) within the same pixel. This multi-functional circuit eliminates the need for separate dedicated circuits for each OLED, reducing overall circuit count and improving aperture ratio while maintaining precise per-pixel emission control through sequential operation of the different color sub-pixels.
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 enhances the aperture ratio of organic light emitting displays by reducing the number of pixel circuits and minimizing color breakup, while maintaining image quality by controlling the emission of red, green, and blue light components effectively.
Implementation Method 1
Electrons and corresponding holes are injected into the emission layer so that they are recombined to generate exciters whose energy is reduced. As a result, light is emitted.
Data Source
AI summary
An organic light emitting display includes a pixel circuit having first, second, and third organic light emitting diodes (OLEDs), for emitting red, green, and blue light, respectively, a driving circuit commonly connected to the OLEDs, and a switching circuits connected to the OLED and the driving circuit to sequentially control the driving thereof. By controlling a plurality of OLEDs, the number of pixel circuits in an organic light emitting display is reduced, thereby reducing the number of scan lines, data lines, and emission control lines, which in turn improves the aperture ratio of the light emitting display. Further, the emission order of the OLEDs is controlled so that it is possible to prevent the generation of color breakup.