Display Driving Voltage Discharge Control for Stable Active Periods
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Solution Overview
Problem
Display devices face challenges in stabilizing source and reference voltages during active and blank periods, leading to potential fluctuations and increased power consumption.
Innovation Solution
Incorporation of a comparison circuit to compare source and reference driving voltages, and a discharge circuit to control and stabilize the source driving voltage by discharging it when necessary, ensuring stable voltage levels during active periods and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage levels are adjusted between active and blank periods, then power consumption is reduced, but voltage stability deteriorates
Solution Approach 1:
The discharge circuit is activated before the active period begins (during the blank period) to pre-discharge the source driving voltage to the reference level. This preliminary action ensures that when the active period starts, the voltage is already stabilized at the correct level, avoiding fluctuations during the critical display period while still allowing power reduction during the blank period.
Solution Approach 2:
The control circuit receives feedback signals indicating the current voltage level and automatically activates the discharge circuit when the source driving voltage exceeds the reference driving voltage. This closed-loop feedback mechanism maintains voltage stability by continuously monitoring and correcting voltage deviations, ensuring that power consumption is reduced without compromising voltage stability during the active period.
2Loss of energy
If voltage changes between periods, then power efficiency improves, but voltage control stability worsens
Solution Approach 1:
The discharge circuit performs voltage adjustment in advance during the blank period, so that by the time the active period begins, the voltage has already been stabilized to the reference level. This timing strategy allows aggressive voltage management for power efficiency without affecting the stability required during display operation.
Solution Approach 2:
The discharge circuit acts as an intermediary component between the power management system and the display panel. It buffers voltage changes by absorbing excess voltage during the blank period and releasing it during the active period, thereby decoupling the power efficiency optimizations from the stability requirements and allowing both to be optimized independently.
3Speed
If source driving voltage is rapidly adjusted, then response speed improves, but voltage fluctuation increases
Solution Approach 1:
The discharge circuit is activated in advance during the blank period to complete voltage adjustments before the active period begins. This timing ensures that rapid voltage changes occur when they will not cause visible fluctuations in the display output, maintaining both fast response speed and visual stability.
Solution Approach 2:
The system employs periodic voltage adjustment cycles synchronized with the display's refresh cycle. Voltage adjustments are made during the blank period (when the display is not actively showing images) and completed before the next active period begins, creating a rhythmic pattern of adjustment that maintains stability while achieving rapid response when needed.
Data Source
AI summary
Embodiments of the present disclosure relate to a display device and a driving method of the same. A display device according to embodiments of the present disclosure may include a comparison circuit for comparing the source driving voltage and a reference driving voltage and outputting a second control signal, and a discharge circuit for comparing the first control signal and the second control signal output from the comparison circuit and discharging the source driving voltage, thereby stably controlling a voltage.