DRD Display Panel Reference Voltage Line Shielding
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Solution Overview
Problem
The double rate driving (DRD) method for organic light emitting display devices results in a reference voltage signal being affected by the data signal, leading to image display issues due to a ripple effect, and there is a need to increase the aperture ratio while ensuring the reference voltage line is not superposed on the data line.
Innovation Solution
A display panel structure is implemented with a reference voltage line positioned between data lines, allowing for the detection of OLED deterioration and maximizing the aperture ratio, comprising first to fourth pixels, data lines, gate lines, power lines, and drivers with specific transistor configurations to manage signal transmission and light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a reference voltage line is disposed between data lines in DRD type display panel, then the aperture ratio is increased, but signal interference occurs between reference voltage line and data lines causing ripple effect
Solution Approach 1:
The patent introduces a ground line as an intermediary element positioned between the reference voltage line and data lines. This ground line acts as a shield that electrically isolates the reference voltage line from data signals, preventing signal interference and ripple effect while allowing the reference voltage line to be disposed between data lines for maximizing aperture ratio
Solution Approach 2:
The patent extracts the harmful data signal from the vicinity of the reference voltage line by positioning the ground line between them. The ground line effectively removes the interfering electric field from the reference voltage line's environment, eliminating the ripple effect while maintaining the space-efficient layout
2Ease of manufacture
If the number of drive ICs is reduced using DRD method, then manufacturing cost is decreased, but reference voltage signal is affected by data signal causing image display issues
Solution Approach 1:
The ground line serves as a protective intermediary that shields the reference voltage signal from data signal interference. This enables reliable reference voltage detection for OLED deterioration monitoring while maintaining the reduced drive IC configuration that lowers manufacturing costs
3Device complexity
If data line and reference voltage line are superposed, then the number of lines is reduced, but signal interference causes dark image display due to ripple effect
Solution Approach 1:
The ground line is introduced as a mediating element between the data line and reference voltage line. It provides electrical isolation that prevents the data signal from interfering with the reference voltage signal, eliminating the ripple effect while maintaining the compact line configuration
Solution Approach 2:
The patent resolves the spatial conflict between data line and reference voltage line by utilizing the vertical dimension. The ground line is positioned in between them in the cross-sectional view, creating vertical separation that prevents interference while allowing both lines to occupy the same horizontal space
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 separates the reference voltage line from the data line, preventing signal interference and maximizing the aperture ratio, thereby improving image display quality and reducing manufacturing costs by minimizing the number of drive ICs required.
Implementation Method 1
uses the principle that, when electrons generated in the cathode and holes generated in the anode are injected into the emission layer, the injected electrons and holes are combined to generate excitons and transition of the generated excitons from an excited state to a ground state causes light emission
Data Source
AI summary
The present disclosure relates to a DRD type display panel. The display panel includes first to fourth pixels; a first data line through which a data signal is transmitted to the first and second pixels; a second data line through which a data signal is transmitted to the third and fourth pixels; a first gate line through which a scan signal is transmitted to the first and third pixels; a second gate line through which a scan signal is transmitted to the second and fourth pixels; a reference voltage line used to detect deterioration of OLEDs in the first to fourth pixels; a first power line positioned on the left of the first data line and supplying driving power to the first and second pixels; and a second power line positioned on the right of the second data line and supplying driving power to the first and second pixels.