Driving Circuit Regulator Control for Display Power Reduction
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Solution Overview
Problem
Existing driving circuits for electro-optical panels, such as liquid-crystal display panels, face high power consumption due to constant operation of voltage boosting and regulator circuits, limiting the reduction of operational current without degrading panel performance.
Innovation Solution
A driving circuit with a control circuit that adjusts the voltage stabilization capability of regulators based on the presence or absence of gray-scale signals, reducing power consumption by setting the capability to a lower level or stopping operation when signals are not supplied, and dynamically managing power supply voltages during different operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the regulator constantly operates to stabilize power supply voltage, then the voltage stabilization capability is maintained, but power consumption increases
Solution Approach 1:
The regulator's operational state is dynamically adjusted based on the operational state of the data line driving circuit. When the data line driving circuit is in operation, the regulator operates at full capability; when the data line driving circuit is not operating, the regulator reduces its operational state or stops operation, thereby adapting the power consumption to actual needs while maintaining voltage stabilization capability when required
Solution Approach 2:
The control circuit automatically controls the regulator's operational state based on the operational state of the data line driving circuit without external intervention. The system self-regulates power consumption by having the control circuit monitor and adjust the regulator's state, eliminating the need for manual control while optimizing energy efficiency
2Use of energy by moving object
If the regulator operational current is reduced to decrease power consumption, then power consumption decreases, but the ability to drive the liquid-crystal display panel is degraded
Solution Approach 1:
The regulator operates periodically rather than constantly, activating only when the data line driving circuit requires power supply. This periodic operation pattern allows the regulator to maintain full current capability when needed while spending more time in a low-power or off state, thereby reducing average power consumption without compromising the ability to drive the display panel when required
3Reliability
If multiple scan lines are driven to alternately cause TFTs to enter OFF state, then threshold voltage change due to gate stress is reduced, but power consumption of the regulator increases
Solution Approach 1:
The regulator's operational state is dynamically coordinated with the scan line driving operation. When scan lines are being driven to alternate TFT OFF states for threshold voltage stabilization, the regulator operates at full capability. When this scanning operation is not occurring, the regulator reduces its operational state, thereby supporting threshold voltage stability when needed while minimizing power consumption during idle periods
Data Source
AI summary
This driving circuit includes a data line driving circuit that supplies a gray-scale signal to a plurality of data lines, a regulator that stabilizes a supplied power supply voltage and supplies the stabilized power supply voltage to a smoothing capacitor and the data line driving circuit, a switching circuit that switches the connection state of a plurality of circuit elements that constitute the regulator, and a control circuit that controls the switching circuit. The control circuit controls the switching circuit so as to set voltage stabilization capability of the regulator to a predetermined level when the gray-scale signal is supplied to pixel elements, and controls the switching circuit so as to set the voltage stabilization capability of the regulator to a level lower than the predetermined level or to stop an operation of the regulator, when the gray-scale signal is not supplied to the pixel elements.