Pixel Circuit Sharing Data Line for OLED Displays
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Solution Overview
Problem
Current OLED display technologies face challenges in reducing the number of signal lines required for pixel circuits, which complicates the fabrication process and hinders the reduction of pixel pitch, leading to increased costs and lower pixel density.
Innovation Solution
A pixel circuit design where three sub-pixel circuits share a data line and a power supply circuit, with switch units controlled by signal control lines to supply voltage levels, reducing the number of signal lines and improving pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each sub-pixel circuit has dedicated signal lines, then the control precision is improved, but the device complexity increases and pixel density decreases
Solution Approach 1:
The patent merges the power supply paths for multiple sub-pixel circuits by using a shared voltage line and a single power supply circuit. The power supply circuit includes a switch unit that can selectively connect the voltage line to different sub-pixel circuits based on scan signals, allowing one power supply circuit to serve multiple sub-pixel circuits instead of each having a dedicated power supply circuit.
Solution Approach 2:
The power supply circuit is designed with multi-functionality to serve multiple sub-pixel circuits. The switch unit within the power supply circuit can be controlled by scan signals to connect the voltage line to different sub-pixel circuits at different times, enabling a single power supply circuit to perform the function of multiple dedicated power supply circuits.
2Reliability
If more signal lines are used for each sub-pixel circuit, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple power supply functions into a single power supply circuit that serves multiple sub-pixel circuits. This reduces the total number of signal lines and transistor components that need to be fabricated, simplifying the manufacturing process while maintaining reliable operation through the switch unit's selective connection capability.
3Length of moving object
If the number of signal lines is reduced, then the pixel pitch is improved, but the control capability deteriorates
Solution Approach 1:
The power supply circuit incorporates a switch unit that dynamically connects or disconnects the voltage line to different sub-pixel circuits based on timing control signals. This dynamic switching capability allows the circuit to adaptively control multiple sub-pixel circuits over time, compensating for the reduced number of physical signal lines and maintaining full control capability.
Solution Approach 2:
The switch unit is controlled by scan signals that operate in a periodic sequence, sequentially enabling power supply to different sub-pixel circuits. This periodic switching allows the single power supply circuit to control multiple sub-pixel circuits in a time-multiplexed manner, preserving control capability while reducing signal line quantity.
Data Source
AI summary
A pixel circuit and a display apparatus. The pixel circuit comprises three sub-pixel circuits (P1, P2, P3) and one power supply circuit (VL), wherein the three sub-pixel circuits (P1, P2, P3) share a data line (Data); the power supply circuit (VL) is connected to a first voltage level terminal (VA), a first signal control line (EM1) and the sub-pixel circuits (P1, P2, P3), and the power supply circuit (VL) is configured to supply a first voltage level to the sub-pixel circuits (P1, P2, P3) through the first voltage level terminal (VA) under the control of a signal of the first signal control line (EM1); and the sub-pixel circuits (P1, P2, P3) are connected to the power supply circuit (VL) and the data line (Data), and are configured to display a gray scale under the control of the first voltage level supplied by the power supply circuit (VL) and a data signal of the data line (Data). The pixel circuit can decrease the number of the signal lines used in the pixel circuit in the display apparatus, reduce the cost of the integrated circuit, and improve the pixel density of the display apparatus.