LED Display Pixel Driving Circuit Static Power Reduction
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Solution Overview
Problem
Existing display screens with electroluminescent diodes face challenges in reducing static consumption, which becomes critical as the number of display pixels increases, leading to higher power consumption and potential heat management issues.
Innovation Solution
The proposed solution involves a display pixel design that includes at least one electroluminescent diode, a driving circuit, and four electrically conductive studs. The piloting circuit is fueled by a first supply voltage and receives a binary signal to alternate between two voltage levels, allowing the electroluminescent diode to be controlled through pulse width modulation, thereby reducing the need for internal voltage generation within the display pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal voltage generation is implemented within each smart pixel, then the pixel can operate independently with complete functionality, but the static power consumption increases significantly
Solution Approach 1:
The voltage generation function is extracted from the smart pixel and relocated to external power supply circuits. The pixel no longer contains internal voltage generation components, instead receiving pre-generated voltages through conductive pads, thereby eliminating the static power consumption associated with internal voltage generation while maintaining operational independence.
Solution Approach 2:
External power supply circuits act as intermediaries between the main power source and the smart pixels. These intermediary circuits generate and distribute the necessary voltages (including negative voltages) to multiple pixels simultaneously, reducing the overall static power consumption while ensuring each pixel receives the required voltage levels for operation.
2Use of energy by stationary object
If additional conductive pads are added to provide reduced supply voltage externally, then static power consumption is reduced, but the pixel dimensions increase
Solution Approach 1:
The conductive pads are designed to serve multiple functions: they provide both the reduced supply voltage and the negative voltage required for pixel operation. By making the pads multi-functional, the patent avoids increasing the number of pads or their dimensions, thereby reducing static power consumption without expanding the pixel area.
Solution Approach 2:
The patent changes the voltage parameters supplied through existing conductive pads, enabling them to carry multiple voltage levels (reduced supply voltage and negative voltage). This parameter change allows the same physical structure to fulfill multiple electrical functions, reducing power consumption without increasing pixel dimensions.
3Measurement precision
If the number of display pixels is increased to achieve higher resolution, then display quality improves, but total static power consumption becomes critical
Solution Approach 1:
The power supply system is segmented into external voltage generation circuits and individual pixel units. Each pixel receives power through standardized conductive pads without internal voltage generation, allowing high-resolution displays with many pixels to be implemented while keeping the static power consumption of each pixel minimal and manageable.
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 static consumption of the display screen by eliminating the need for internal voltage generation in each display pixel, while maintaining the dimensions of the display pixels and minimizing the number of interconnections, thus addressing the challenge of increasing power consumption with higher pixel densities.
Implementation Method 1
Each display sub-pixel may comprise a light source, in particular a light-emitting diode
Implementation Method 2
at least one light-emitting diode, a circuit for driving the light-emitting diode
Data Source
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Figure 3~4
Figure 5~6
AI summary
The present disclosure relates to a display pixel (12i,j) comprising at least one light-emitting diode (LED), a driver (40) for driving the LED and first, second, third, and fourth conductive pads (36). The driver is powered by a first supply voltage (Vdd) received between the first and second pads. The LED is powered by a first binary signal (Vcci, Veei), received between the third and second pads, and alternating between a second supply voltage (Vcc), strictly higher than the first voltage, and a third voltage, strictly lower than the first voltage. The driver (40) is configured to determine a digital signal (R, G, B) from the values of a second binary signal (Dataj) on the fourth pad, received during each of first pulses of the first binary signal at the third voltage, and to control the LED on the basis of the digital signal.