OLED Sensing Circuit Feedback Voltage Parasitic Capacitance
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Solution Overview
Problem
Electroluminescent display devices with organic light-emitting diodes (OLEDs) face a challenge in maintaining image quality due to changes in threshold voltage over time, leading to deviations in current flow, which affects the accuracy of sensing pixels when multiple pixels share a sensing line, causing parasitic capacitance issues.
Innovation Solution
An electroluminescent display device and method that includes a sensing circuit to sense electrical characteristics of a sensing pixel using a shared sensing line, with a feedback unit applying a feedback voltage to minimize potential differences between the sensing line and data line of non-sensing pixels, utilizing an amplifier and feedback switch to adjust voltages and prevent parasitic capacitance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple pixels share one sensing line, then device complexity is reduced, but sensing accuracy deteriorates due to parasitic capacitance of non-sensing pixels
Solution Approach 1:
The patent applies feedback by applying a feedback voltage to the data line of the non-sensing pixel based on the sensing voltage. This feedback mechanism dynamically adjusts the voltage to minimize potential difference between the sensing line and data line, thereby reducing parasitic capacitance effects and maintaining sensing accuracy while allowing multiple pixels to share the sensing line.
Solution Approach 2:
The patent changes the voltage parameter by applying a specifically designed feedback voltage to the non-sensing pixel's data line. This voltage adjustment minimizes the potential difference between the sensing line and data line, effectively reducing parasitic capacitance and improving sensing accuracy without requiring separate sensing lines for each pixel.
2Measurement precision
If feedback voltage is applied to minimize potential difference, then sensing accuracy is improved, but device complexity increases due to additional feedback circuit
Solution Approach 1:
The feedback circuit components, particularly the amplifier and feedback switch, serve multiple functions: they generate the feedback voltage, minimize potential difference between sensing and data lines, and can be integrated with existing pixel structures. This multi-functionality reduces the need for entirely separate dedicated parasitic capacitance compensation circuits.
Solution Approach 2:
The non-sensing pixel's data line is utilized to provide feedback voltage that compensates for parasitic capacitance effects. Instead of requiring entirely separate compensation circuits, the system uses existing circuit elements (data lines, amplifiers, switches) to serve the dual purpose of data transmission and parasitic capacitance management, reducing overall device complexity.
Data Source
AI summary
The present disclosure relates to an electroluminescent display device and a method for sensing electrical characteristics thereof, and the electroluminescent display device includes a display panel including a plurality of pixels including a sensing pixel and a non-sensing pixel connected to each data line, the plurality of pixels sharing one sensing line, a sensing circuit configured to sense an electrical characteristic value of the sensing pixel based on a sensing voltage applied to the shared sensing line, and a feedback unit configured to apply a feedback voltage according to the sensing voltage applied to the shared sensing line to the data line of the non-sensing pixel.