Display Demultiplexer Control Signals for Lower Driver Power

Solution Overview

Problem

Existing display devices face challenges in reducing power consumption and dead space due to the use of demultiplexers and output buffers, which are not optimized for efficient voltage control and signal transmission.

Innovation Solution

The display device incorporates a demultiplexer with transistors that have controlled voltage levels and toggling durations for control signals, reducing the difference in voltage levels and alternating turn-on times to minimize power consumption and voltage deviations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a demultiplexer is used to connect data lines and output buffers in a many-to-one manner, then the number of output buffers is reduced and the area of the data driver is reduced, but power consumption increases due to voltage level differences and continuous operation

Engineering Contradiction:

Improvearea of data driverVSAvoidpower consumption

Core Design Contradiction:

Area of stationary objectVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by reducing the voltage level difference between turn-on and turn-off states of control signals. Specifically, the control signals are designed to have a reduced voltage swing (e.g., from 0V to 5V instead of larger swings), which directly lowers the power consumption of the demultiplexer while maintaining its many-to-one connection function

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements periodic action by using toggleable control signals that switch between turn-on and turn-off states in a periodic manner. The control signals are toggled at specific timing intervals to selectively activate different transistors in the demultiplexer, enabling efficient signal distribution while allowing transistors to be turned off during non-active periods, thereby reducing overall power consumption

Inventive Principle:

Principle #19Periodic action

2Productivity

If control signals toggle frequently to switch between data lines, then signal transmission efficiency is improved, but power consumption increases due to repeated voltage transitions

Engineering Contradiction:

Improvesignal transmission efficiencyVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent uses periodic action by implementing toggleable control signals that switch between turn-on and turn-off states in a periodic manner. The control signals are toggled at specific timing intervals to selectively activate different transistors in the demultiplexer, enabling efficient signal distribution while allowing transistors to be turned off during non-active periods, thereby reducing overall power consumption

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies parameter changes by reducing the voltage level difference between turn-on and turn-off states of control signals. Specifically, the control signals are designed to have a reduced voltage swing (e.g., from 0V to 5V instead of larger swings), which directly lowers the power consumption of the demultiplexer while maintaining its many-to-one connection function

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If the turn-on and turn-off voltage levels of control signals are optimized, then power consumption is reduced, but voltage deviations between different control signals may occur

Engineering Contradiction:

Improvepower consumptionVSAvoidvoltage deviation

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies asymmetry by designing different control signals with asymmetric voltage level characteristics. Specifically, different control signals may have different turn-on voltage levels (e.g., first control signal turns on at a higher voltage than the second control signal), which allows optimization of power consumption for each signal while maintaining reliable operation through carefully designed voltage thresholds

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent applies parameter changes by reducing the voltage level difference between turn-on and turn-off states of control signals. Specifically, the control signals are designed to have a reduced voltage swing (e.g., from 0V to 5V instead of larger swings), which directly lowers the power consumption of the demultiplexer while maintaining its many-to-one connection function

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250372037A1Display device and electronic apparatus including the same

Publication Date: 2025.12.04 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a first pixel connected to a first scan line which transmits a first scan signal and a first data line, a second pixel connected to the first scan line and a second data line, a data driver including an output buffer which outputs a data signal to an output line, and a demultiplexer including a first transistor connected between the first data line and the output line and turned-on in response to a first control signal, and a second transistor connected between the second data line and the output line and turned-on in response to a second control signal. A difference between a turn-on voltage level and a turn-off voltage level of each of the first and second control signals is less than a difference between a turn-on voltage level and a turn-off voltage level of the first scan signal.