Display Driving Circuit Without Output Switches for Lower Power
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Solution Overview
Problem
Conventional display apparatuses face high power consumption and increased temperature due to high impedance switches in back-end circuits, which also hinder volume reduction.
Innovation Solution
A driving circuit with a reduced number of switches is implemented, using control signals to manage the transmission of analog data within specific channels, eliminating the need for high impedance switches at operational amplifiers' output terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high impedance switches are disposed at output terminals of operational amplifiers to switch analog data to specific channels, then channel switching capability is achieved, but power consumption increases and temperature rises
Solution Approach 1:
The patent removes the high impedance switches from the output terminals of operational amplifiers entirely. Instead, the switching function is achieved by selectively enabling or disabling specific operational amplifiers based on which channel needs to transmit data. This extraction of the switching mechanism eliminates the power consumption and heat generation associated with high impedance switches while maintaining channel switching capability.
Solution Approach 2:
Rather than using switches to actively route signals to different channels, the patent inverts the approach by having operational amplifiers remain in their respective channels and selectively activating only the amplifier needed for the current transmission task. This inversion transforms the switching problem from an active routing mechanism to a selective activation mechanism, reducing power consumption.
2Adaptability or versatility
If high impedance switches are disposed at output terminals of operational amplifiers, then channel switching is enabled, but circuit volume increases
Solution Approach 1:
The patent extracts and removes the physical high impedance switch components from the circuit design. By eliminating these discrete switching components and replacing them with selective operational amplifier activation, the overall circuit volume is reduced while the channel switching function is preserved through control signal management.
3Adaptability or versatility
If high impedance switches are used in back-end circuits, then signal routing flexibility is achieved, but manufacturing cost increases
Solution Approach 1:
The patent removes high impedance switches from the back-end circuit design, thereby eliminating the need to source, procure, and assemble these additional components. This extraction simplifies the manufacturing process and reduces component costs while maintaining signal routing flexibility through the selective activation of operational amplifiers controlled by enable signals.
Data Source
AI summary
A driving circuit includes channels, a positive converting unit, a negative converting unit, an input switch, and an operational amplifier. A first digital data and a second digital data are alternatively transmitted in a first channel and a second channel. The positive converting unit and negative converting unit are respectively disposed in first channel and second channel and convert first digital data and second digital data into a positive analog data and a negative analog data. A first input terminal and a second input terminal of operational amplifier are respectively in first channel and second channel. After input switch respectively transmits positive analog data and negative analog data to first input terminal and second input terminal or to second input terminal and first input terminal, positive analog data and negative analog data are transmitted in a channel of the channels corresponding to entering operational amplifier.