OLED Pixel Circuit With Time-Shared Data Line Cathode Control
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Solution Overview
Problem
Organic light-emitting diode (OLED) display panels have high power consumption due to sub-pixels sharing a common cathode layer, which requires a voltage based on the highest cathode voltage among them, leading to increased power consumption for other sub-pixels.
Innovation Solution
A pixel circuit design that includes a drive circuit, data write circuit, and light-emitting device, where the data line transmits data voltage during writing and second power voltage during emission, allowing separate control of cathode voltages for different sub-pixels by reusing the data line in a time-sharing manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub-pixels share a common cathode layer with a voltage based on the highest cathode voltage, then all sub-pixels can operate, but power consumption increases for other sub-pixels
Solution Approach 1:
The patent segments the common cathode layer into individual cathode electrodes for each sub-pixel. Each cathode electrode is independently controlled by its own data line, allowing each sub-pixel to have its own optimized cathode voltage rather than using a uniform high voltage for all sub-pixels. This segmentation enables independent voltage control, reducing power consumption for sub-pixels that require lower voltages.
Solution Approach 2:
The data line is designed to serve multiple functions: during the data writing stage, it transmits data voltage to the drive circuit, and during the light emission stage, it transmits the second power voltage (cathode voltage) to the light-emitting device. This time-sharing multi-functionality reduces the need for separate dedicated cathode voltage lines, simplifying the overall wiring structure while enabling independent cathode voltage control.
2Use of energy by moving object
If separate cathode voltage control is implemented for each sub-pixel, then power consumption is reduced, but the number of wiring lines increases
Solution Approach 1:
The data line performs dual functions by transmitting different voltages at different times. During the data writing stage (first time period), it carries data voltage to the drive circuit. During the light emission stage (second time period), it carries the second power voltage to the light-emitting device's cathode electrode. This time-sharing approach allows one line to replace what would otherwise require separate dedicated lines, reducing overall wiring complexity.
Solution Approach 2:
The system dynamically switches the function of the data line between different time periods. The data line transitions from transmitting data voltage during writing to transmitting cathode voltage during emission, controlled by timing signals. This dynamic time-division multiplexing allows flexible voltage control without permanent dedicated wiring for each function.
Data Source
AI summary
A pixel circuit includes a drive circuit, a data write circuit, and a light-emitting device; the data write circuit is connected between a data line and the drive circuit and is configured to transmit a data voltage of the data line to the drive circuit during a data writing stage; the drive circuit is connected between a power line and a first electrode of the light-emitting device, a second electrode of the light-emitting device is connected to the data line, and during a light emission stage, a second power voltage is transmitted to the second electrode of the light-emitting device through the data line connected to the second electrode of the light-emitting device.