Electroluminescent Display Voltage Transfer Part
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Solution Overview
Problem
Electroluminescence displays face issues such as vertical luminance non-uniformity and crosstalk due to voltage drops in the voltage supply lines, which existing compensation methods fail to adequately address.
Innovation Solution
A pixel circuit design that includes a voltage transfer part to compensate for voltage drops by applying a reference voltage to subpixels, reducing the number of electrodes and contacts within each subpixel and simplifying the circuit layout, thereby improving picture quality and enabling high-resolution displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing compensation methods are used to improve pixel circuit accuracy, then time-varying characteristics can be compensated, but voltage drops in voltage supply lines are not taken into consideration resulting in vertical luminance non-uniformity and crosstalk
Solution Approach 1:
The voltage supply system is segmented into multiple voltage supply lines (first voltage supply line, second voltage supply line, third voltage supply line) that are independently controlled. Each line can be selectively connected to subpixels based on their position and voltage requirements, allowing differential voltage compensation across different regions of the display panel to address vertical luminance non-uniformity caused by voltage drops.
Solution Approach 2:
Different voltage levels are applied to different regions of the display panel through the segmented voltage supply lines. Subpixels connected to the first voltage supply line receive a different voltage than those connected to the second or third lines, enabling local compensation for voltage drops that varies by position, thereby eliminating vertical luminance non-uniformity while maintaining picture quality.
2Measurement precision
If the number of electrodes and contacts in subpixels is increased to improve signal transfer accuracy, then voltage drop compensation becomes more precise, but device complexity increases
Solution Approach 1:
Transistor structures serve as intermediary components that selectively connect subpixels to different voltage supply lines. These transistors act as switches controlled by gate signals, enabling accurate voltage selection and compensation without requiring additional electrodes or contacts within each subpixel, thus maintaining signal transfer accuracy while avoiding increased device complexity.
Solution Approach 2:
The voltage supply lines and transistor structures serve multiple functions: they provide voltage compensation, control signal routing, and region-specific power management. This multi-functionality allows the system to achieve precise signal transfer accuracy through voltage drop compensation without adding dedicated compensation electrodes or contacts, thereby avoiding increased device complexity.
Data Source
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AI summary
There is provided an electroluminescence display device comprising a display panel having a display area (AA) where images are displayed and a non-display area (NA) where images are not displayed, a subpixel (SP) located in the display area, and a voltage transfer part (VRD) that is located in the non-display area and transfers a reference voltage (VREF) to the subpixel in response to a signal applied from outside the display panel or a signal generated on the display panel.