Pixel Level-Shifter With Internal Boosted Reference for Low-Power Displays
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Solution Overview
Problem
Existing AR and VR headset devices suffer from bulky and have short battery life due to power consumed by the power consumed circuits, with the bulky and have a bulky and bulky components, and also occupy a relatively large area, having a need for improved circuits for driving pixels of displays in head-wearable apparatuses such as AR and VR headsets, which are not efficient in power consumption and size.
Innovation Solution
A pixel level-shifter with an internal reference voltage generator and level-shifting circuit that generates a boosted drive signal, reducing power consumption and size by eliminating the need for dual-level external reference voltages and using bootstrapped signals to control high-voltage components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional pixel driving circuits are used, then the display can be driven, but power consumption is high and area is large
Solution Approach 1:
The patent changes the voltage domain parameters by introducing an internal reference voltage generator that creates a boosted voltage domain within the pixel circuit. This allows the level-shifter to operate with higher effective voltages for signal translation while maintaining compatibility with the display's low-voltage domain, thereby reducing power consumption without sacrificing driving capability
Solution Approach 2:
The patent introduces an internal reference voltage generator as an intermediary component within the pixel circuit. This generator creates a boosted voltage domain that acts as a mediator between the low-voltage domain and the high-voltage domain, enabling efficient signal translation while eliminating the need for external dual-level reference voltages, thus reducing both power consumption and circuit area
2Area of stationary object
If conventional pixel driving circuits are used, then the display can be driven, but the circuit area is large
Solution Approach 1:
The patent merges the internal reference voltage generator with the level-shifter circuit within the same pixel structure. This integration allows the boosted voltage domain to be generated locally without requiring separate external reference voltage circuits, thereby reducing the overall circuit area while maintaining the ability to drive high-resolution displays
Solution Approach 2:
The internal reference voltage generator serves as a compact intermediary that enables voltage domain translation within the pixel circuit itself, eliminating the need for larger external reference voltage generation circuits and allowing for higher pixel density in the display
3Measurement precision
If dual-level external reference voltages are used, then signal translation is accurate, but power consumption increases
Solution Approach 1:
The patent replaces the external dual-level reference voltage system with an internal reference voltage generator that creates a boosted voltage domain. This internal generator acts as an intermediary that provides accurate voltage translation levels without requiring external dual-level references, thereby maintaining signal translation accuracy while reducing power consumption from external voltage supplies
Solution Approach 2:
The pixel circuit becomes self-sufficient by generating its own internal reference voltage through the internal reference voltage generator. This self-service approach eliminates the need for external dual-level reference voltage supplies, reducing power consumption while maintaining the accuracy needed for proper signal translation between voltage domains
Data Source
AI summary
A pixel level-shifter for driving a pixel of a display has a reduced power consumption and a reduced size. The pixel level-shifter includes an internal reference voltage generator that receives an external reference voltage signal and generates an internal reference voltage signal based on the external reference voltage signal. A level-shifting circuit receives a low voltage pixel output signal and generates a boosted drive signal based on the low voltage pixel output signal and the internal reference voltage signal. A first transistor circuit is coupled between a high voltage pixel supply voltage node and a pixel electrode node and includes a control node coupled to receive the boosted drive voltage signal. The first transistor circuit controls application of a high voltage pixel supply voltage signal on the pixel electrode node in response to the boosted drive signal.