Row-Line PWM Driving for Display Panel Peak Power Reduction
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Solution Overview
Problem
Conventional display panels using inorganic light emitting devices face challenges in color reproducibility due to wavelength changes with driving current magnitude, leading to increased power consumption and design restrictions.
Innovation Solution
A display module with a driving unit that applies PWM data voltage and light emission control signals in a row-line order, allowing sub-pixels to emit light for set times and remain off during predetermined periods, reducing peak power consumption and optimizing inorganic light emitting device operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If PWM driving method is used to express grayscale of sub-pixels, then color reproducibility is improved, but peak power consumption increases
Solution Approach 1:
The patent divides the display panel into multiple row-lines and applies PWM driving method sequentially to each row-line rather than to all sub-pixels simultaneously. This segmentation in time and space allows the grayscale expression to maintain color reproducibility while distributing the peak current demand across different time intervals, thereby reducing the overall peak power consumption requirement
Solution Approach 2:
The patent implements periodic light emission by controlling sub-pixels to emit light only during specific time intervals corresponding to their row-line PWM cycles, with predetermined periods where no light is emitted. This periodic action maintains the grayscale accuracy through PWM while reducing the continuous peak power demand by introducing off-periods
2Illumination intensity
If high peak current is applied during light emission section, then light emission intensity is improved, but power supply capacity requirement increases
Solution Approach 1:
The patent segments the light emission process by row-line, where each row-line receives high peak current during its specific PWM cycle but not simultaneously with other row-lines. This temporal segmentation maintains sufficient light emission intensity for each activated row-line while reducing the total power supply capacity requirement, as the power supply only needs to handle the peak demand of one row-line at a time rather than all row-lines simultaneously
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
Improves color reproducibility, reduces power consumption, and enables more efficient and stable driving of inorganic light emitting devices, allowing for smaller and lighter display panels while detecting malfunctions in real use.
Implementation Method 1
A conventional display panel in which an inorganic light emitting device such as a red light emitting diode (LED), a green LED, or a blue LED
Data Source
AI summary
A display module comprises: a display panel; and a driving unit configured to apply a first control signal for setting a PWM data voltage to sub-pixels, included in each row-line of the display panel for each image frame, to the sub-pixels in a row-line order, and apply a second control signal for controlling the light emission of sub-pixels, included in each row-line, to the sub-pixel in a row-line order, wherein the sub-pixels included in each row-line emit light for a time corresponding to the PWM data voltage set according to the first control signal, based on the second control signal applied to the light emission section corresponding to the image frame, and do not emit light for a preset time based on second control signal applied in a period between consecutive image frame periods.