OLED Pixel Circuit with Shared Reference Lines for Threshold Voltage Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing OLED display devices face issues with uneven brightness due to the drifting threshold voltage of thin-film transistors, which requires extensive metal wiring for voltage detection, occupying significant space and hindering the realization of narrow frames.
Innovation Solution
The implementation of an organic light-emitting display panel with a pixel unit comprising four subpixels (red, blue, green, and non-white) sharing a reference signal line, reducing metal line usage and enabling precise threshold voltage detection, while improving color gamut and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of metal wires are used to detect threshold voltage of driving transistors, then measurement precision is improved, but device complexity and area increase
Solution Approach 1:
The patent merges the reference signal lines for multiple subpixels into a shared infrastructure. Specifically, the fourth subpixel shares reference signal lines with other subpixels, reducing the total number of metal wires required while maintaining the capability to detect threshold voltages of all driving transistors accurately.
Solution Approach 2:
The reference signal lines are designed to serve multiple functions: they provide reference voltages for threshold detection and are shared across multiple subpixels (first, second, third, and fourth subpixels). This multi-functionality reduces the overall wire count while preserving measurement precision.
2Measurement precision
If more metal lines are used for threshold voltage detection, then measurement precision is improved, but area occupied by pixel driving circuit increases
Solution Approach 1:
The patent combines reference signal lines so that the fourth subpixel shares them with other subpixels. This merging reduces the total metal line area while maintaining the ability to perform precise threshold voltage detection across all subpixels.
Solution Approach 2:
The patent optimizes the spatial arrangement of subpixels within the pixel unit, positioning them to share reference signal lines efficiently. This dimensional optimization reduces the area occupied by metal lines while preserving measurement capabilities.
3Adaptability or versatility
If four subpixels with different colors are arranged in a pixel unit, then color gamut is improved, but device complexity increases
Solution Approach 1:
The patent combines four differently colored subpixels (first, second, third, and fourth subpixels with distinct colors) into a single pixel unit. By sharing reference signal lines among these subpixels, the design achieves expanded color gamut while controlling circuit complexity through resource sharing.
Solution Approach 2:
The pixel is segmented into four distinct subpixels, each responsible for a specific color. This segmentation enables broader color gamut while the shared reference signal infrastructure manages the complexity that would otherwise arise from having four independent circuits.
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 effectively reduces the space occupied by metal lines, enhances color reproduction, and maintains brightness by compensating for subpixel aging, ensuring balanced display performance.
Implementation Method 1
When a power supply supplies an appropriate voltage, a hole of an anode and electrons of a cathode can be combined together in the light-emitting layer to produce light
Data Source
AI summary
The present application discloses an organic light-emitting display panel and a driving method thereof, as well as an organic light-emitting display device. The display panel includes: an array arrangement including pixel units, wherein each pixel unit comprises a first, a second, a third and a fourth subpixels; a pixel circuit is formed in each subpixel; the first, second, third and fourth subpixels of an identical pixel unit are arranged along a column direction and are electrically connected with a given reference signal line; a color of the first subpixel, a color of the second subpixel, a color of the third subpixel and a color of the fourth subpixel differ from one another, and the color of the first subpixel, the color the second subpixel and the color the third subpixel are red, blue and green, respectively; and the color of the fourth subpixel is not white.