Pixel Circuit Driving Transistors Voltage Division
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Solution Overview
Problem
LED display apparatuses face challenges in reducing power consumption due to the high voltage division and power consumption proportion of the pixel circuit, which is limited by the voltage control accuracy of the driver chip.
Innovation Solution
The pixel circuit incorporates a plurality of driving transistors with different width-to-length ratios for current output and gating sub-circuits that control the transmission of driving currents to light-emitting devices, allowing for reduced voltage division and power consumption without altering the voltage control accuracy or grayscale display range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the pixel circuit uses a single driving transistor with high voltage division to achieve sufficient driving current, then the driving capability is improved, but the power consumption of the pixel circuit increases significantly
Solution Approach 1:
The patent divides the single driving transistor function into multiple driving transistors (first driving transistor and second driving transistor) with different width-to-length ratios. This segmentation allows the circuit to achieve sufficient driving current through parallel operation of multiple transistors rather than relying on a single transistor with excessive voltage division, thereby reducing overall power consumption while maintaining driving capability.
Solution Approach 2:
The patent assigns different width-to-length ratios to different driving transistors to optimize their individual characteristics. The first driving transistor has a width-to-length ratio configured for higher current output capability, while the second has a different ratio optimized for its specific function. This local quality differentiation enables efficient current distribution and reduces the voltage division burden on each transistor, lowering overall power consumption.
2Use of energy by moving object
If the pixel circuit reduces voltage division to lower power consumption, then energy efficiency is improved, but the grayscale display range and voltage control accuracy may be compromised
Solution Approach 1:
The patent changes the parameters of multiple driving transistors (width-to-length ratios) to achieve different current output characteristics. By carefully selecting these parameters, the circuit maintains precise voltage control capability while reducing the overall voltage division requirement. The gating sub-circuits further enable precise control by selectively activating specific driving transistors based on the desired grayscale level, thus maintaining voltage control accuracy with reduced power consumption.
Solution Approach 2:
The patent introduces gating sub-circuits that dynamically select which driving transistor to activate based on the required grayscale level. This dynamic switching capability allows the circuit to maintain high voltage control accuracy by using only the necessary driving strength for each display level, avoiding the continuous high power consumption that would result from always using the maximum voltage division capability.
3Adaptability or versatility
If multiple driving transistors with different width-to-length ratios are used, then current output flexibility is improved, but the device complexity increases
Solution Approach 1:
The patent segments the driving function into multiple transistors with different width-to-length ratios, enabling flexible current output by selectively activating appropriate transistors. The gating sub-circuits segment the control signals to match with specific driving transistors, providing adaptability while keeping the overall structure manageable through systematic organization.
Solution Approach 2:
The gating sub-circuits serve multiple functions: they select which driving transistor to activate, control the timing of current output, and enable grayscale modulation. This multi-functionality reduces the need for separate control mechanisms for each driving transistor, thereby limiting the increase in device complexity despite the enhanced current output flexibility.
Data Source
AI summary
A pixel circuit includes a plurality of driving transistors and a plurality of gating sub-circuits. The plurality of driving transistors are configured to output different driving currents under control of a received control signal. Each gating sub-circuit is electrically connected to a respective selection signal terminal, a scanning signal terminal, a respective driving transistor and a light-emitting device, and is configured to be turned on under control of a scanning signal from the scanning signal terminal and a selection signal from the selection signal terminal to transmit a driving current from the connected driving transistor to the light-emitting device. Within a frame period, one of a plurality of selection signal terminals respectively electrically connected to the plurality of gating sub-circuits outputs a selection signal.