Field-Sequential Pixel Drive Circuit for Compact Color Displays
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Solution Overview
Problem
Existing AR headsets and displays, such as LCoS and microLED displays, are bulky and inefficient due to high power consumption and large size, making them unsuitable for comfortable, long-term use in mobile systems like AR and VR devices.
Innovation Solution
A field-sequential driving method is employed to drive sub-pixels using a single pixel drive circuit, sharing circuitry among multiple subpixels, reducing the need for separate drive circuits and optimizing power and area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate drive circuits are used for each subpixel, then each subpixel can be driven independently, but the device size and power consumption increase significantly
Solution Approach 1:
Multiple subpixel drive circuits are merged into a single shared drive circuit that can control different subpixels at different times. The drive circuit includes a driver transistor, storage capacitor, and control logic that are shared among red, green, and blue subpixels, eliminating the need for separate drive circuits for each subpixel and significantly reducing the overall device area.
Solution Approach 2:
The display operates in a field-sequential manner where subpixels are driven in periodic time slots within a frame. The control logic multiplexes the shared drive circuit to sequentially drive different subpixels (red, green, blue) in a periodic fashion, allowing independent control of each subpixel while using the same hardware resources.
2Ease of manufacture
If TFT arrays are used to drive LED displays, then the displays can be manufactured at lower cost, but power consumption increases due to high resistance
Solution Approach 1:
The display uses field-sequential driving where subpixels are activated in periodic time slots rather than continuously. This periodic operation reduces the average current through the TFT arrays, thereby reducing power consumption while maintaining the ability to drive LED displays with standard TFT manufacturing processes.
Solution Approach 2:
The patent optimizes the timing parameters of the field-sequential drive scheme to minimize the duration each subpixel is active. By carefully controlling the time slots and duty cycles, the system reduces the integrated power consumption while maintaining display quality, effectively changing the operational parameters to reduce energy usage.
3Adaptability or versatility
If color sequential driving is used with LCoS, then multiple colors can be displayed, but the display size increases due to multiple panels or spatial color arrangement
Solution Approach 1:
The patent combines multiple color subpixels (red, green, blue LEDs) within a single master pixel structure, eliminating the need for separate panels for each color. The shared drive circuit and field-sequential control enable a single physical pixel to display multiple colors, significantly reducing the overall display system size while maintaining full color capability.
Solution Approach 2:
The display uses field-sequential color driving where different colored subpixels within the same master pixel are activated in periodic time slots. This allows a single physical pixel location to present different colors sequentially, achieving color display capability without requiring multiple spatial arrangements or separate panels.
Data Source
AI summary
A system of the present invention reduces the size and/or increases the efficiency of a display system or device that integrates or includes a display, for example, an LED display such as a microLED display and OLED display or an LCoS display into such system or device. Embodiments of the present disclosure include, but are not limited to, a display wherein the at least two pixels are four pixels comprising two green pixels, one blue pixel, and one red pixel, and wherein a pixel logic circuit maintains the red pixel in an on state while driving the two green pixels and the blue pixel in accordance with a field sequential color (FSC) pixel drive process or method.