Display Driving Device Current Recycling and Bypass Circuit
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Solution Overview
Problem
Conventional display driving devices face challenges in reducing power consumption effectively due to the need for multiple voltage levels, which complicates circuit design and increases manufacturing costs, especially in mobile devices requiring lower electricity consumption.
Innovation Solution
A display driving device incorporating a high voltage operating unit, a low voltage operating unit, a recycling circuit, and a current bypass circuit to manage operating currents and voltages efficiently, allowing for reduced electricity consumption by recycling current and controlling voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple voltage levels are used for different circuit units, then each unit can operate at its optimal voltage, but power consumption cannot be reduced effectively and device complexity increases
Solution Approach 1:
The patent changes the voltage parameter dynamically by introducing a voltage conversion unit that converts between first voltage and second voltage. The voltage level is adjusted based on operational needs, allowing the system to switch between high voltage mode (for driving the display panel) and low voltage mode (for reduced power consumption during normal operation), thus resolving the contradiction between maintaining optimal operating voltage and reducing power consumption.
2Use of energy by moving object
If power supply voltage and operating current are decreased to reduce electricity consumption, then power consumption reduces, but desired properties cannot be obtained and operating conditions must be changed
Solution Approach 1:
The patent implements dynamic voltage conversion between first voltage and second voltage based on operational requirements. When high performance is needed, the system operates at first voltage; when power saving is prioritized, it switches to second voltage. This dynamic adjustment allows the system to achieve desired properties when needed while reducing power consumption during normal operation, without being constrained to fixed voltage levels.
3Reliability
If voltage regulator circuits are added to generate multiple voltages from high voltage, then voltage requirements are met, but device complexity and manufacturing cost increase
Solution Approach 1:
The voltage conversion unit is designed to perform multiple functions: it can convert first voltage to second voltage, and also convert second voltage back to first voltage. This bidirectional conversion capability means a single unit handles what would otherwise require separate voltage regulator circuits for each direction, reducing overall device complexity while still meeting all voltage requirements for different circuit units.
Data Source
AI summary
A display driving device includes a high voltage operating unit obtaining an operating current according to the application of the high power supply voltage from the first voltage application line; a low voltage operating unit that operates according to an application of a low power supply voltage to control the high voltage operating unit; a recycling circuit that receives the operating current from the high voltage operating unit via a relay coupling line and applies the low power supply voltage to the low voltage operating unit while supplying the received operating current to a reference potential line via the low voltage operating unit; and a current bypass circuit that flows a part of the operating current flowing through the relay coupling line into the reference potential line without supplying the part of the operating current to the recycling circuit according to a voltage increase in the low power supply voltage.