Display Driver IC Power Management for Touch Response and PMIC Protection
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Solution Overview
Problem
Display driver integrated circuits (ICs) face damage from reverse currents when entering power saving modes due to potential increases in power supply voltage, and in-cell touch panels require quick responses even in low power modes, which existing technologies fail to address effectively.
Innovation Solution
A display driver IC with a booster and power level adjustor that selectively boosts external power supply voltage to internal levels and activates current paths to ground or between nodes to manage voltage levels, preventing damage and enabling quick responses in power saving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display driver IC enters a power saving mode to reduce power consumption, then power consumption is reduced, but the internal power supply voltage may not be sufficient for quick touch responses
Solution Approach 1:
The power level adjustor pre-charges the internal power supply voltage to a reference voltage level before the display driver IC enters power saving mode. This preliminary action ensures that when the mode switches, the voltage is already at an appropriate level for quick touch responses, eliminating the need for slow voltage buildup during low-power operation
Solution Approach 2:
The system dynamically changes the voltage parameter of the internal power supply based on operating mode. In power saving mode, the power level adjustor maintains the voltage at a reference level rather than allowing it to drop to external power supply levels, enabling quick touch responses while still reducing overall power consumption compared to full operation mode
2Use of energy by moving object
If the internal power supply voltage is discharged to the level of external power supply voltage in power saving mode, then power consumption is reduced, but the PMIC may be damaged by reverse current
Solution Approach 1:
Before the display driver IC enters power saving mode, the power level adjustor pre-charges the internal power supply voltage to match the reference voltage level. This preliminary voltage adjustment prevents the voltage differential that would cause reverse current flow to the PMIC, thereby protecting the PMIC while still enabling power saving operation
Solution Approach 2:
The power level adjustor applies a counteracting action by charging the internal power supply voltage to the reference voltage before mode switching occurs. This preliminary anti-action prevents the harmful reverse current effect from occurring in the first place, rather than attempting to mitigate it after the fact
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution stabilizes operation by preventing potential increases in power management ICs and enables quick touch responses in power saving modes, ensuring efficient and safe operation of display driver ICs and in-cell touch panels.
Implementation Method 1
a booster configured to boost an external power supply voltage applied to a first node to a same level as that of an internal power supply voltage
Implementation Method 2
a power level adjustor configured to discharge the internal power supply voltage to a same level as that of an external power supply voltage when the display driver IC enters a first mode
Data Source
AI summary
A display driver integrated circuit (IC) and an electronic apparatus including the same are provided. The display driver IC includes a booster configured to boost an external power supply voltage applied to a first node to a same level as that of an internal power supply voltage, and a power supplier including a power level adjustor configured to activate a current path between a second node and ground in response to a control signal indicating entry into a first mode and form a current path between the first node and the second node when the internal power supply voltage at the second node is equal to a reference voltage.