Display Driver Current Reuse Circuit for Lower Power Consumption
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Solution Overview
Problem
Conventional display driving devices face challenges in reducing power consumption effectively, as they require multiple voltage levels for operation, leading to increased manufacturing costs and inefficient energy use, especially in mobile devices where high-definition displays are demanded without frequent battery charging.
Innovation Solution
A display driving device configuration that includes a high supply voltage operation unit, a low supply voltage operation unit, and a reuse circuit, where the operating current from the high supply voltage unit is reused to supply a low supply voltage to the low supply voltage operation unit, optimizing current utilization and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple voltage levels are used for different operation units, then the display panel can be driven with desired voltage levels, but power consumption increases
Solution Approach 1:
The patent combines the power supply functions by making the low supply voltage operation unit share the operating current from the high supply voltage operation unit. The reuse circuit connects the ground side of the high supply voltage operation unit to the power supply of the low supply voltage operation unit, merging their current paths and eliminating redundant current flow, thereby reducing overall power consumption.
Solution Approach 2:
The patent recovers the operating current that would otherwise be discarded to ground from the high supply voltage operation unit. The reuse circuit captures this current and redirects it to power the low supply voltage operation unit, transforming waste current into a useful power source and reducing the need for additional power supply current.
2Use of energy by moving object
If circuit changes are made to reduce supply voltage or operating current, then power consumption may be reduced, but manufacturing cost increases
Solution Approach 1:
The operating current from the high supply voltage operation unit serves multiple functions simultaneously: it drives the high supply voltage operation unit itself and also powers the low supply voltage operation unit through the reuse circuit. This multi-functional use of the same current path eliminates the need for separate power supply circuits, reducing manufacturing complexity and cost.
Solution Approach 2:
The high supply voltage operation unit effectively powers itself and the low supply voltage operation unit through its own operating current. The reuse circuit enables the system to be self-sufficient by internally recycling the operating current, eliminating the need for additional external power supply circuits and reducing manufacturing requirements.
3Power
If conventional voltage regulator circuits are used to generate multiple voltages, then desired voltage levels can be obtained, but device complexity increases
Solution Approach 1:
The patent extracts and removes the complex voltage regulator circuits from the system. Instead of using conventional regulator circuits to generate multiple voltage levels, the invention uses a simplified reuse circuit that redirects existing operating current, eliminating the need for complex voltage regulation hardware while maintaining the required voltage levels for different operation units.
Solution Approach 2:
Conventional approaches use voltage regulator circuits to step down high voltage to low voltage. This patent inverts the approach by using the operating current from the high voltage unit to directly power the low voltage unit through current redirection, eliminating the need for traditional voltage regulation circuitry and simplifying the overall device architecture.
Data Source
AI summary
A display driving device comprising: a high supply voltage operation unit that generates an operating current under application of a high supply voltage so as to supply driving voltages to a display panel; a low supply voltage operation unit that operates under the application of a low supply voltage lower than the high supply voltage and controls the high supply voltage operation unit; and a reuse circuit that receives the operating current from the high supply voltage operation unit and supplies the operating current to a ground side via the low supply voltage operation unit so as to apply the low supply voltage to the low supply voltage operation unit.