OLED Display Scan Power Signal Line Merging
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Solution Overview
Problem
Conventional OLED display devices face issues with reduced aperture ratio and brightness due to the restriction of spaces for OLEDs and pixel driving circuits caused by multiple signal lines, leading to increased power consumption and rapid deterioration, as well as insufficient current application due to limited size.
Innovation Solution
The OLED display device uses a single signal line to apply a scan power signal to a gate line, which includes a scan pulse to turn on a switching TFT and provides a power voltage to allow the OLED to emit light, utilizing a storage capacitor to charge a data voltage and supply it to a driving TFT, thereby controlling the current to the OLED.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple signal lines (data lines, reference lines, power lines, gate lines) are provided on the display panel, then the pixel driving circuit can be properly controlled, but the space for OLEDs and pixel driving circuits is restricted, reducing aperture ratio and brightness
Solution Approach 1:
The patent merges the power line and gate line into a single scan power signal line. This scan power signal line simultaneously provides both the gate control signal and the power supply voltage to the pixel driving circuit, eliminating the need for separate power lines and increasing the aperture ratio
Solution Approach 2:
The scan power signal line serves multiple functions: it acts as both a gate line for controlling the switching transistor and a power line for supplying operating voltage to the pixel driving circuit. This multi-functionality reduces the total number of signal lines required
2Ease of operation
If multiple signal lines are provided on the display panel, then proper pixel driving control is achieved, but the aperture ratio and brightness level are reduced
Solution Approach 1:
By combining the power line and gate line into one scan power signal line, more area is available for OLEDs, which directly increases the aperture ratio and consequently the brightness level of the display
3Ease of operation
If the aperture ratio is reduced due to multiple signal lines, then signal control is adequate, but power consumption increases and OLED deterioration accelerates
Solution Approach 1:
The merged scan power signal line reduces the total line count, increasing aperture ratio and allowing sufficient current to reach OLEDs without requiring excessive current compensation, thereby reducing power consumption and preventing rapid OLED deterioration
4Ease of operation
If multiple signal lines are used, then pixel driving circuit control is sufficient, but the space for OLEDs is restricted, preventing sufficient current application
Solution Approach 1:
The patent combines the power line and gate line into a single scan power signal line, freeing up space that can be allocated to OLEDs. This increased space allows sufficient current to be applied to the OLEDs without being restricted by line density
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 approach improves the aperture ratio and brightness level, reduces power consumption, and prevents rapid deterioration by ensuring sufficient current application to the OLEDs, while also simplifying the circuit configuration and reducing production costs.
Implementation Method 1
emitting light from an organic emission layer using recombination of electrons and holes
Implementation Method 2
a storage capacitor, and a driving TFT, wherein the switching TFT charges the data voltage in the storage capacitor
Data Source
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Figure 5~6
AI summary
Disclosed is an organic light-emitting diode (OLED) display device and a method for driving the same for providing a signal to control a transistor and a power voltage to drive an OLED by using one signal line.