Display Apparatus Crosstalk Compensation via Intermediary Transistor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The issue of crosstalk caused by parasitic capacitance between link lines and pixels in organic light emitting display apparatuses, which deteriorates image quality due to voltage coupling and charging amount distortion.
Innovation Solution
A display apparatus with a data compensation portion that calculates the voltage coupling amount and compensation value for pixels, applying these values to input image data to generate compensated image data, thereby reducing crosstalk effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If link lines are placed within the display region to implement a narrow bezel, then the bezel width is reduced, but parasitic capacitance is formed causing crosstalk and deteriorating image quality
Solution Approach 1:
A compensation transistor is introduced as an intermediary element between the pixel circuit and the link line. This transistor acts as a mediator to actively counterbalance the parasitic capacitance effect by injecting a compensating charge that offsets the voltage coupling caused by the parasitic capacitance, thereby eliminating crosstalk while maintaining the narrow bezel structure
Solution Approach 2:
The invention changes the electrical parameters of the pixel circuit by adding a compensation transistor that dynamically adjusts the charge state of the pixel. By controlling the gate voltage of the compensation transistor during specific time periods, the system compensates for the voltage coupling effect, effectively changing the net capacitance parameter to eliminate crosstalk
2Ease of manufacture
If link lines are placed within the display region, then manufacturing complexity is reduced, but parasitic capacitance causes voltage coupling and charging amount distortion
Solution Approach 1:
The compensation transistor serves as an intermediary that decouples the harmful voltage coupling effect from the beneficial narrow bezel structure. By placing this active compensation element within the pixel circuit, the system maintains the simple manufacturing layout while actively correcting the voltage coupling distortion through controlled charge injection
3Object-affected harmful factors
If parasitic capacitance is reduced by increasing distance between link line and pixel, then crosstalk is reduced, but device area increases and bezel width increases
Solution Approach 1:
Rather than physically separating the link line and pixel to reduce parasitic capacitance, the invention introduces a compensation transistor as an intermediary that actively neutralizes the capacitance effect. This allows the link line to remain close to the pixel (maintaining compact display area) while the compensation transistor cancels out the harmful voltage coupling through controlled charge injection
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
Improves image quality by effectively compensating for crosstalk caused by parasitic capacitance, resulting in reduced distortion and enhanced display performance.
Implementation Method 1
a vertical link line disposed in the first region, extending in the vertical direction, and forming a parasitic capacitance with the first node of the first pixel
Data Source
AI summary
A display apparatus includes: a display panel in which a display region including first to third regions is defined, and which includes a first data line and a second data line connected to first and second pixels of the first and second regions; a driving transistor, a sampling transistor, and a data supply transistor included in each of the first and second pixels; a vertical link line in the first region, and forming a parasitic capacitance with a first node of the first pixel; a horizontal link line in the third region, and connecting the vertical link line and the second data line; and a data compensation portion which calculates a voltage coupling amount caused in the first pixel according to a change of data voltage applied to the vertical link line and provided to the second pixels during the sampling section after the data writing section of the first pixel, calculates a compensation value for the voltage coupling amount, and applies the compensation value to a first input image data of the first pixel to generate a compensated image data.