OLED Pixel Circuit Using Adjacent Data Lines to Shorten Monitor Time
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic EL display devices, the shared data signal line and monitor line configuration increases the number of wiring lines, leading to longer monitor times due to the need for separate potential applications and measurement stabilization periods during characteristic detection.
Innovation Solution
A display device with separate data signal lines and monitor control lines allows for simultaneous use of adjacent data signal lines as both write and read lines for characteristic detection, reducing monitor time without increasing the number of wiring lines by overlapping potential application and measurement periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If separate data signal lines and monitor lines are used, then the monitor time is reduced, but the number of wiring lines increases
Solution Approach 1:
The patent segments the pixel circuit into distinct writing and monitoring functional blocks. The writing transistor controls data signal input while the monitoring transistor handles characteristic detection, allowing these operations to occur on separate signal paths simultaneously, thus reducing monitor time without requiring additional external wiring lines beyond the standard data signal lines
Solution Approach 2:
The data signal line serves dual functions: it acts as a write line during normal operation and as a read line during characteristic detection. This multi-functionality eliminates the need for separate dedicated monitor lines, reducing wiring complexity while enabling parallel operations that shorten monitor time
2Device complexity
If the data signal line is shared for both writing and monitoring, then the number of wiring lines is reduced, but the monitor time increases
Solution Approach 1:
The patent implements dynamic switching of the data signal line function through control signals. The monitoring transistor is selectively activated to switch the data signal line between write mode and read mode, enabling time-multiplexed operation that reduces wiring complexity while managing monitor time through optimized switching sequences
Solution Approach 2:
The patent employs periodic switching between writing and monitoring operations on the shared data signal line. By alternating between these modes in structured time periods and using control signals to manage transitions, the system achieves efficient characteristic detection without requiring separate dedicated wiring lines
Data Source
AI summary
With respect to a display device having an external compensation function, a monitor time can be shortened without increasing the number of wiring lines. A pixel circuit in an i-th row and a j-th column includes an organic EL element (display element), a writing control transistor, a drive transistor, a monitor control transistor, and a holding capacitor. A control terminal of the drive transistor is connected to a data signal line S(j) in the j-th column via the write control transistor. The monitor control transistor includes a first conduction terminal connected to a second conduction terminal of the drive transistor, and a second conduction terminal connected to a data signal line S(j+1) in a (j+1)-th column.