Display Current Sensing Timing for Accurate Rush Current Detection

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Solution Overview

Problem

Existing display devices face challenges in efficiently converting panel current into digital current codes while maintaining accurate rush current detection and reducing power consumption, as the conversion time is often fixed and not adjusted based on the voltage level of the power supply voltage.

Innovation Solution

A display device that sets the conversion time of a current sensing circuit based on the voltage level of the power supply voltage, adjusting the conversion time to decrease as the voltage increases and increase as the voltage decreases, thereby improving rush current detection accuracy and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the conversion time is fixed and not adjusted based on voltage level, then the current sensing circuit operates with constant timing, but the rush current detection accuracy deteriorates and power consumption increases

Engineering Contradiction:

Improverush current detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the conversion time variable rather than fixed. The controller dynamically adjusts the conversion time based on the detected power supply voltage level, allowing the current sensing circuit to adapt its operation timing to match actual operating conditions, thereby improving detection accuracy while optimizing power consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of conversion time based on another parameter (power supply voltage level). By detecting different voltage levels and corresponding conversion times, the system optimizes the sensing operation for each operating condition, resolving the contradiction between measurement precision and energy consumption.

Inventive Principle:

Principle #35Parameter changes

2Speed

If the conversion time is decreased to enable rapid rush current detection, then the detection speed improves, but the power consumption increases

Engineering Contradiction:

Improverush current detection speedVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts conversion time based on voltage level, enabling short conversion times (rapid detection) only when voltage levels indicate rush current conditions. During normal operation with stable voltage levels, longer conversion times are used to reduce power consumption, thus resolving the speed-power consumption trade-off.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The current sensing circuit performs conversion operations periodically with variable timing. The controller determines appropriate conversion times based on detected voltage levels, creating a periodic sensing rhythm that adapts to operating conditions - rapid sensing when needed, slower sensing when stable, optimizing both detection speed and power consumption.

Inventive Principle:

Principle #19Periodic action

3Loss of energy

If the conversion time is increased to reduce power consumption, then the energy efficiency improves, but the rush current detection accuracy deteriorates

Engineering Contradiction:

Improvepower consumptionVSAvoidrush current detection accuracy

Core Design Contradiction:

Loss of energyVSMeasurement precision

Solution Approach 1:

The patent changes the conversion time parameter based on the power supply voltage level parameter. By establishing correspondence between voltage levels and optimal conversion times, the system ensures adequate detection accuracy during rush current events (when voltage indicates such conditions) while using longer conversion times during normal operation to minimize power consumption.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If a fixed conversion time is used for all voltage levels, then the circuit operation is simplified, but the current sensing accuracy under varying voltage conditions deteriorates

Engineering Contradiction:

Improvecircuit operation complexityVSAvoidcurrent sensing accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces dynamic adjustment of conversion time based on detected voltage levels. The controller monitors power supply voltage and automatically selects appropriate conversion times from predetermined values, maintaining simple circuit operation while significantly improving current sensing accuracy under varying voltage conditions through adaptive timing.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12536940B2Display device, controller and current sensing integrated circuit

Publication Date: 2026.01.27 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel including a plurality of pixels, a power management circuit which supplies a power supply voltage to the plurality of pixels through a power supply line, a current sensing circuit which generates a digital current code by sensing a panel current flowing through the power supply line, and a controller which determines a peak gray level and a panel load by analyzing input image data, determines a voltage level of the power supply voltage based on the peak gray level and the panel load, and sets a conversion time, during which the panel current is converted into a digital current code, based on the voltage level of the power supply voltage.