Display Device Bypass Transistor High Luminance Control
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Solution Overview
Problem
Display devices face challenges in achieving high luminance without requiring higher voltages, which often result in increased power consumption and potential voltage range limitations when used outdoors.
Innovation Solution
The display device incorporates a pixel structure with a bypass transistor and sub-driving transistors, allowing for two modes of operation where the bypass transistor is turned off or on, enabling the same input image to be output with different luminances, with the second luminance being higher, without the need for higher voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If higher voltage is applied to achieve higher luminance, then luminance is improved, but power consumption increases and voltage range limitations occur
Solution Approach 1:
The first transistor is divided into two sub-driving transistors connected in series, allowing the voltage to be distributed across multiple components. This segmentation enables higher luminance through increased voltage without requiring a single high-voltage component, thus managing power consumption more effectively
Solution Approach 2:
The bypass transistor is introduced to dynamically adjust the circuit configuration between two modes: series connection (higher luminance) and parallel connection (lower power consumption). This dynamic switching allows the system to adapt to different operating conditions, achieving high luminance when needed while conserving energy during normal operation
2Illumination intensity
If higher voltage is applied to achieve higher luminance, then luminance is improved, but the voltage exceeds the supported range of the display device
Solution Approach 1:
By segmenting the first transistor into two sub-driving transistors connected in series, the circuit achieves higher effective voltage for luminance enhancement while each individual transistor operates within its safe voltage range, maintaining reliability
Solution Approach 2:
The bypass transistor serves as an intermediary that controls the circuit configuration. When activated, it creates alternative current paths that allow high luminance output without subjecting any single component to excessive voltage, thus protecting the display device from voltage-related damage
Data Source
AI summary
A display device according to embodiments of the present invention includes pixels, each of the pixels includes a first transistor and a bypass transistor, the first transistor includes a first sub-driving transistor and a second sub-driving transistor, the first sub-driving transistor has a gate electrode connected to a first node, a first electrode connected to a second node, and a second electrode connected to a third node, the second sub-driving transistor has a gate electrode connected to the first node, a first electrode connected to the third node, and a second electrode connected to a fourth node, and the bypass transistor is connected in parallel to one of the first sub-driving transistor and the second sub-driving transistor.