Adjacent Pixel Capacitance Merging for OLED Definition
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Solution Overview
Problem
High-definition organic electroluminescence (EL) display devices face challenges in reducing pixel size while maintaining image quality due to decreased capacitance values, leading to reduced light emitting current and dynamic range.
Innovation Solution
The display device incorporates a first and second pixel with drive transistors, light emitting elements, and additional capacitors, where the light emitting elements of adjacent pixels are electrically connected through a capacitor control transistor to increase capacitance, allowing for a larger light emitting current and wider dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is reduced to achieve high definition, then the definition is improved, but the capacitance value of the capacitor element is reduced
Solution Approach 1:
The patent merges the capacitor elements of adjacent pixels by electrically connecting them through a capacitor control transistor. This allows multiple capacitor elements to function as a single larger capacitor, increasing the total capacitance value available to each pixel without increasing pixel size. The merging enables high-definition display while maintaining sufficient capacitance for proper pixel operation.
2Measurement precision
If the pixel size is reduced to achieve high definition, then the definition is improved, but the light emitting current is reduced
Solution Approach 1:
By merging capacitor elements from adjacent pixels, the patent increases the total capacitance available to drive the light emitting element. This larger capacitance enables the pixel to accumulate and deliver higher light emitting current, overcoming the current reduction that would normally result from pixel size reduction.
3Measurement precision
If the pixel size is reduced to achieve high definition, then the definition is improved, but the dynamic range is reduced
Solution Approach 1:
The patent merges capacitor elements to increase total capacitance, which directly expands the dynamic range of each pixel. The larger capacitance allows for greater charge storage capacity, enabling the pixel to handle a wider range of signal levels and improve adaptability for high-definition display applications.
Data Source
AI summary
A display device includes a first pixel arranged with a first light emitting element having a first pixel electrode and a common electrode, and a drive transistor having an input/output terminal, one end of the input/output terminal being connected to the first pixel electrode, and a second pixel adjoins the first pixel electrode, and is arranged with a second light emitting element having a second pixel electrode and the common electrode, wherein the first pixel electrode and the second pixel electrode are connected via first switch.