Pixel Driving Circuit for Electroluminescent Display
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Solution Overview
Problem
Electroluminescent display panels face issues with defective image quality due to static electricity, which can cause bright spots and variations in driving characteristics between pixels, leading to irregular image quality.
Innovation Solution
The implementation of a pixel driving circuit with a specific configuration that includes a driving element, switching circuits, and a capacitor, where the anode electrode is connected to a high potential voltage and the cathode electrode is connected to a low potential voltage, suppressing the generation of bright spots by managing the voltage and current supply to the light emitting diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pixel driving circuit is implemented using conventional transistor configuration, then the display device can operate with standard driving characteristics, but static electricity can damage the insulating layer causing bright spot defects
Solution Approach 1:
The patent applies preliminary anti-action by configuring the pixel driving circuit to preemptively protect against static electricity damage. Specifically, the circuit is designed with a transistor configuration where the source is connected to a first power line, the drain is connected to a second power line, and the gate is connected to a signal line, creating an inherent protection mechanism that prevents static electricity from damaging the insulating layer before damage can occur.
Solution Approach 2:
The patent converts the harmful effect of static electricity into a beneficial protection mechanism. By deliberately configuring the transistor with specific power line connections and utilizing the voltage differential between the first power line and second power line, the circuit transforms potential static electricity damage into a protective feature that actually prevents bright spot defects.
2Ease of manufacture
If process variation occurs during transistor manufacturing, then production can proceed with standard processes, but driving characteristics between pixels vary causing image quality irregularity
Solution Approach 1:
The patent applies parameter changes by modifying the electrical parameters of the pixel driving circuit to compensate for manufacturing variations. The specific configuration where the source connects to the first power line and the drain connects to the second power line creates a voltage reference system that normalizes driving characteristics across pixels, compensating for process variations without requiring complex manufacturing controls.
3Ease of manufacture
If the insulating layer is damaged by static electricity, then the transistor can be formed, but the damaged insulating layer causes continuous bright spot defects
Solution Approach 1:
The patent implements beforehand cushioning by designing the pixel driving circuit with inherent protection against insulating layer damage. The transistor configuration with source connected to first power line, drain to second power line, and gate to signal line creates a protective voltage distribution that cushions the insulating layer from static electricity damage during and after transistor formation, preventing bright spot defects before they can occur.
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 reduces the occurrence of bright spots and enhances image quality by maintaining consistent driving current and luminance across pixels, improving the overall resolution and reliability of the display panel.
Implementation Method 1
an organic light emitting display device, a liquid crystal display device, and a quantum dot display device... The organic light emitting display device includes an organic light emitting diode which is a self-emitting device and the LED display device includes a light emitting diode (LED) which is a self-emitting device
Data Source
AI summary
A display panel includes a pixel including sub pixels. The pixel includes a sub pixel area in which the sub pixels are disposed and a common area. The pixel includes a light emitting diode including an anode electrode and a cathode electrode, and the anode electrode is electrically connected to a first power line to which a high potential voltage is supplied. Each of the sub pixels includes a driving element in which a source is connected to a N1 node, a gate is connected to a N2 node, and a drain is connected to a N3 node, a capacitor connected to the N2 node and a N4 node; a N1 switching circuit connected to the N1 node; a N2 switching circuit connected to the N2 node; a N3 switching circuit connected to the N3 node; and a N4 switching circuit connected to the N4 node.