OLED Panel Crosstalk Reduction via Row Reset Control
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Solution Overview
Problem
In organic light-emitting display panels, leakage currents between adjacent subpixels cause image blurring and color mixing due to shared integral film layers, leading to crosstalk between subpixels with different colors.
Innovation Solution
The implementation of a common layer shared between adjacent light-emitting elements, where the pixel-driving circuits of subpixels in the same row are connected to a common light emission control signal line and reset control signal line, allowing for controlled leakage current management by setting subpixels to a reset voltage during non-emission stages to prevent crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If integral film layers are used for hole auxiliary transport layer, light-emitting layer and electron auxiliary transport layer to increase subpixel density, then subpixel density is improved, but leakage current between adjacent subpixels increases causing image blurring and color mixing
Solution Approach 1:
The patent divides the integral film layers into separate regions for adjacent subpixels by introducing isolation structures. Specifically, the hole auxiliary transport layer, light-emitting layer, and electron auxiliary transport layer are segmented using isolation trenches or isolation insulating films between adjacent subpixels, preventing holes from migrating between subpixels while maintaining the integral film structure within each subpixel.
Solution Approach 2:
The patent extracts the harmful leakage current path by removing or isolating the connecting regions between adjacent subpixels. Isolation trenches are etched to remove the organic film layers in the regions between subpixels, or isolation insulating films are deposited to block the leakage current paths, thereby extracting the harmful electrical connection between adjacent subpixels.
2Area of stationary object
If integral film layers are used to prepare relatively-small-sized display panels, then display panel size is reduced, but leakage current affects signal voltage of adjacent light-emitting elements causing blurring and color mixing
Solution Approach 1:
The patent segments the continuous film layers between adjacent subpixels using isolation structures, creating electrical boundaries that prevent leakage current from affecting the signal voltage of adjacent light-emitting elements. This segmentation maintains the compact design while ensuring signal integrity.
Solution Approach 2:
The patent introduces isolation insulating films as intermediary structures between adjacent subpixels. These insulating films act as mediators that block the leakage current paths while allowing the compact integral film structure to be maintained, thereby protecting the signal voltage stability of adjacent light-emitting elements.
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 solution effectively reduces crosstalk between subpixels with different colors by managing leakage currents, thereby improving image clarity and color accuracy in organic light-emitting display panels.
Implementation Method 1
each light-emitting element includes an anode, a hole auxiliary transport layer, a light-emitting layer, an electron auxiliary transport layer and a cathode which are stacked
Data Source
AI summary
Provided is an organic light-emitting display panel. Pixel-driving circuits of subpixels in a same row of pixel units are connected to a same light emission control signal line. The pixel-driving circuits of the subpixels in the same row of pixel units are connected to a same reset control signal line; and an anode of a light-emitting element of each of the subpixels to which the pixel-driving circuits electrically connected to the reset control signal line belong is at a reset voltage. In a display period of each frame of image, in at least part of a period during which an i-th row of pixel units are in a light emission stage, anodes of light-emitting elements of a j-th row of pixel units are at a reset voltage; and the j-th row of pixel units and the i-th row of pixel units are adjacent two rows of pixel units.