OLED Pixel Circuit Parallel Capacitor Sensing
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Solution Overview
Problem
Existing OLED display technologies face challenges in accelerating charging speed and increasing the accuracy of sensed values during the sensing stage, leading to suboptimal luminous uniformity and display effects.
Innovation Solution
A pixel circuit comprising a first selection circuit, a first driving circuit, a first sensing circuit, a first organic light emitting element, a second capacitor, and a capacitor control circuit, which allows the first and second capacitors to be connected in parallel during the sensing stage to enhance capacitance and accuracy of sensed values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single capacitor is used in the pixel circuit, then the circuit complexity is reduced, but the charging speed in the sensing stage is slow and the accuracy of sensed values is insufficient
Solution Approach 1:
The patent combines two capacitors (first capacitor and second capacitor) into the pixel circuit, where the first capacitor is connected in parallel with the second capacitor during the sensing stage. This merging of capacitive elements increases the total capacitance available for sensing, thereby improving the accuracy of sensed values and accelerating the charging speed without significantly increasing circuit complexity
Solution Approach 2:
The patent introduces a capacitor control circuit that dynamically switches the connection state of the second capacitor based on the operational stage. During the sensing stage, the second capacitor is connected in parallel to enhance capacitance for accurate sensing. During the driving stage, the second capacitor is disconnected to avoid affecting the normal operation. This dynamic reconfiguration allows the circuit to optimize performance for different operational requirements
2Speed
If the capacitance is increased to accelerate charging speed, then the charging speed in sensing stage is improved, but the circuit complexity increases
Solution Approach 1:
The patent merges two capacitors into the pixel circuit configuration, where the first capacitor and second capacitor are connected in parallel during the sensing stage. This merging effectively doubles the available capacitance for charging during sensing, thereby accelerating the charging speed and improving sensing accuracy without requiring a single large capacitor that would increase manufacturing complexity
Solution Approach 2:
The capacitor control circuit dynamically connects and disconnects the second capacitor based on operational stage. During sensing, the second capacitor is connected to provide additional capacitance for fast charging. During driving operation, it is disconnected to avoid interfering with normal pixel operation. This dynamic approach allows the system to achieve high charging speed when needed without permanently increasing circuit complexity
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 accelerates the charging speed and increases the accuracy of sensed values, thereby improving the compensation effect and luminous uniformity of the display panel, reducing manufacturing costs, and enhancing the display effect.
Implementation Method 1
a capacitor control circuit, wherein the capacitor control circuit is configured to allow the first capacitor and the second capacitor to be connected in parallel or to be disconnected
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3A
AI summary
A pixel circuit and a driving method thereof, and a display panel is provided. The pixel circuit (100) includes a first selection circuit (102), a first driving circuit (101), a first capacitor (121), a first sensing circuit (103), a first organic light emitting element (131), a second capacitor (122) and a capacitor control circuit (123). The first selection circuit (102) and the first capacitor (121) are electrically connected with each other, and are configured to control the first driving circuit (101); the first driving circuit (101) is electrically connected to the first organic light emitting element (131), and is configured to drive the first organic light emitting element (131); the first sensing circuit (103) is electrically connected to the first driving circuit (101) and the first organic light emitting element (131) and is configured to sense the first driving circuit (101) or the first organic light emitting element (131); and the capacitor control circuit (123) is configured to allow the first capacitor (121) and the second capacitor (122) to be connected in parallel or to be disconnected. The pixel circuit accelerates the charging speed in the sensing stage, increases the accuracy of the sensed value, and thus improves the compensation effect of the pixel circuit; therefore, the luminous uniformity of the display panel is increased, and the display effect is improved.