Display Pixel Voltage Shifting for Lower Power at Constant Luminance
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Solution Overview
Problem
Display devices, particularly self-luminous displays like OLEDs, face challenges in minimizing power consumption while maintaining luminance levels.
Innovation Solution
A display device design that adjusts the reference voltage and data voltage levels, shifting the data voltage range and analog power supply voltage to reduce power consumption without altering luminance, achieved through a pixel structure with transistors and capacitors that generate a driving current based on the voltage difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the reference voltage is decreased to reduce power consumption, then power consumption is reduced, but the data voltage range must be shifted to maintain luminance
Solution Approach 1:
The patent applies parameter changes by systematically adjusting multiple voltage parameters (reference voltage VREF, data voltage range, and analog power supply voltage AVDD) in coordination. When VREF is decreased, the data voltage range is shifted by the same voltage level, and AVDD is correspondingly adjusted, maintaining the voltage difference relationship that determines luminance while reducing overall power consumption
Solution Approach 2:
The patent implements dynamic voltage adjustment where the reference voltage, data voltage range, and analog power supply voltage are not fixed but can be dynamically shifted together. This allows the display device to adapt voltage levels to different operating conditions, reducing power consumption while maintaining proper luminance output through coordinated voltage level changes
2Use of energy by moving object
If the analog power supply voltage is decreased to reduce power consumption, then power consumption is reduced, but the luminance must be maintained through coordinated voltage adjustments
Solution Approach 1:
The patent changes multiple voltage parameters simultaneously - decreasing the analog power supply voltage AVDD while also adjusting the reference voltage VREF and shifting the data voltage range by corresponding amounts. This coordinated parameter change ensures that the voltage difference (VREF - VDAT) that determines luminance is maintained, allowing power consumption reduction without compromising display brightness
Solution Approach 2:
The patent implements a feedback mechanism where the relationship between voltage parameters is continuously maintained. When AVDD is decreased, the system compensates by adjusting VREF and VDAT ranges accordingly, ensuring that the driving current and resulting luminance remain within acceptable ranges despite the lower power supply voltage
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
Reduces power consumption by up to 42.6% without changing luminance, achieved by maintaining a constant luminance through adjusted voltage levels and shifted data voltage ranges.
Implementation Method 1
the first transistor generates a driving current, the light emitting element emits light based on the driving current
Data Source
AI summary
A display device including: a display panel including a pixel; and a panel driver configured to provide a reference voltage and a data voltage to the pixel, wherein the pixel emits light with a luminance corresponding to a difference between the reference voltage and the data voltage, and when the reference voltage changes, and a range of the data voltage is shifted by a voltage level that corresponds to the amount of change in the reference voltage.