Dynamic VOP Driving Scheme for Flash Panel Brightness
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Solution Overview
Problem
Display panels used as flash sources face challenges in power management due to IR drop and headroom margin, leading to potential color shift and luminance drop, especially when operating in flash mode, where high transient emission power is required, and insufficient power delivery can cause battery shutdown.
Innovation Solution
Implementing a dynamic panel operation voltage (VOP) scheme that time multiplexes between different VOP levels across all Vdd input lines, allowing specific subpixel groups to emit different wavelengths, and modulating emission pulse width or current source pulse width to achieve color tuning and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high transient emission power is applied to achieve high brightness flash mode, then illumination intensity is improved, but power consumption increases and battery shutdown risk occurs
Solution Approach 1:
The patent applies dynamic voltage scaling by switching between multiple VOP levels (first VOP level for high brightness, second VOP level for normal operation) based on operational mode. This dynamic adjustment allows the display panel to deliver high transient power for flash mode when needed, while consuming less power during normal display operation, thus resolving the contradiction between flash brightness and overall power consumption
Solution Approach 2:
The patent implements periodic switching between different VOP levels through time multiplexing, where the display alternates between first VOP level (higher power) and second VOP level (lower power) across all Vdd input lines. This periodic action enables the system to accumulate necessary charge for flash emission while limiting continuous power draw, preventing battery shutdown while maintaining flash capability
2Illumination intensity
If high VOP level is applied across all Vdd input lines to maintain peak luminance, then brightness is improved, but IR drop and headroom margin issues worsen
Solution Approach 1:
The patent dynamically adjusts VOP levels based on operational requirements. During flash mode, the first VOP level is applied to ensure sufficient voltage headroom for high brightness emission. During normal operation, the second VOP level (lower than first) is applied to reduce IR drop effects and maintain stable power delivery, thus resolving the contradiction between peak luminance and power delivery stability
Solution Approach 2:
The patent changes the voltage parameter (VOP level) applied across Vdd input lines based on operational mode. By switching between first VOP level (higher voltage for flash) and second VOP level (lower voltage for normal operation), the system optimizes both peak luminance during flash and power delivery stability during normal operation, preventing voltage droop and headroom margin issues
3Use of energy by moving object
If time multiplexing between multiple VOP levels is implemented, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent employs dynamic VOP switching controlled by a power management unit that receives mode selection signals and accordingly applies different VOP levels across all Vdd input lines. This dynamic control enables power consumption reduction through time multiplexing while keeping the control architecture relatively simple, as the same control mechanism manages both display and flash operations
Solution Approach 2:
The patent makes the Vdd input lines and power management circuitry multi-functional by using them for both normal display operation and flash emission modes. The same physical infrastructure (Vdd lines, power management unit) serves dual purposes by switching between first and second VOP levels, eliminating the need for separate dedicated circuits and thus reducing overall device complexity despite the time multiplexing scheme
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces emission power supply, lowers flash power consumption, maintains whole screen peak luminance, and achieves color balancing while preventing battery shutdown, by dynamically adjusting VOP levels and pulse widths, thus enhancing power management and color accuracy.
Implementation Method 1
emitting a first wavelength range from a first subpixel group during application of the first VOP level across all of the Vdd input lines and emitting a second wavelength range from a second subpixel group during application of the second VOP level across all of the Vdd input lines
Data Source
AI summary
Driving methods and display systems are described for operating a display panel in flash mode. In an embodiment, the driving method includes time multiplexing between at least two panel operation voltage (VOP) levels including a first VOP level and a second VOP level across all Vdd input lines to a display area, and emitting a first wavelength range from a first subpixel group during application of the first VOP level across all of the Vdd input lines and emitting a second wavelength range from a second subpixel group during application of the second VOP level across all of the Vdd input lines.