OLED Pixel Circuit Layout for Parasitic Capacitance Shielding
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Solution Overview
Problem
In active matrix display devices, parasitic capacitance between adjacent pixel circuits can cause operational interference, leading to reduced display quality, especially in small-sized organic light emitting diode (OLED) displays where the distance between pixel circuits is minimized, resulting in significant coupling effects.
Innovation Solution
Incorporating an electricity supply region as an active area between adjacent pixel circuits in the diffusion layer of the display device to act as a shield, reducing parasitic capacitance and operational interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between adjacent pixel circuits is reduced to minimize display device size, then the size of the display device is reduced, but parasitic capacitance coupling between pixel circuits increases causing operational interference
Solution Approach 1:
An electricity supply region is introduced as an intermediary structure between adjacent pixel circuits. This region serves as a shield that reduces parasitic capacitance coupling while allowing the pixel circuits to be positioned closer together, thus enabling miniaturization without sacrificing operational independence
Solution Approach 2:
The electricity supply region is strategically positioned only in specific locations between adjacent pixel circuits where parasitic capacitance coupling occurs. This localized approach provides shielding exactly where needed without increasing overall device size or adding unnecessary structures throughout the entire display
2Object-affected harmful factors
If shielding structures are added between pixel circuits to reduce parasitic capacitance, then coupling between pixel circuits is reduced, but device complexity increases
Solution Approach 1:
The electricity supply region performs multiple functions simultaneously: it supplies electricity to the pixel circuits and acts as a shield to reduce parasitic capacitance coupling. This multi-functionality eliminates the need for separate shielding structures, thereby reducing device complexity while achieving the desired shielding effect
Solution Approach 2:
The shielding function is merged with the electricity supply function in a single integrated structure. By combining these two functions into the electricity supply region, the patent avoids adding extra components and maintains manufacturing simplicity
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 display quality by ensuring each pixel circuit operates independently, achieving desired luminance and improving the overall display performance, particularly in compact OLED displays.
Implementation Method 1
it is feared that a parasitic capacitance will be formed between an active area of a diffusion layer in a pixel circuit and an active area of a diffusion layer in an adjacent other pixel circuit, and coupling via the parasitic capacitance will be caused between the active areas
Data Source
AI summary
Provided is a display device including: a pixel unit in which a plurality of pixel circuits (PIX_A, PIX_B, PIX_C) each of which includes a light emitting element and a driving circuit configured to drive the light emitting element are arranged in a matrix form. In a diffusion layer in which transistors included in the driving circuits of the pixel circuits (PIX_A, PIX_B, PIX_C) are formed, an electricity supply region (223) that is an active area for supplying an electric potential to a well is provided between mutually adjacent ones of the pixel circuits (PIX_A, PIX_B, PIX_C).