Display Driving IC Transition Count Control for Power and EMI Reduction
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Solution Overview
Problem
Display driving integrated circuits face increased power consumption and electromagnetic interference (EMI) due to higher frequencies required for high-resolution display devices.
Innovation Solution
The integration of a timing controller with a data selecting unit, data randomizing unit, and data transmitting unit that compares transition counts of input and encoded data, randomizes selection data, and converts it into output data, reducing power consumption and attenuating EMI by embedding clock signals and using random patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the driving frequency is increased to support high-resolution displays, then the display resolution is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transition count of data signals transmitted to the display panel. The timing controller monitors and modifies the data transition characteristics to reduce switching operations in the source driver, thereby lowering power consumption while maintaining high-resolution display capabilities
Solution Approach 2:
The patent uses data encoding techniques that create compressed or optimized representations of pixel data. By transmitting encoded data with fewer transitions instead of full pixel data, the system reduces the energy required for signal transmission and processing while preserving the high-resolution image quality
2Manufacturing precision
If the driving frequency is increased to support high-resolution displays, then the display resolution is improved, but electromagnetic interference (EMI) increases
Solution Approach 1:
The patent modifies the temporal characteristics of data signals by controlling transition counts and using randomization techniques. These parameter changes spread electromagnetic emissions over a wider frequency range and reduce peak EMI levels, allowing high-resolution displays to operate at required frequencies without excessive electromagnetic interference
Solution Approach 2:
The timing controller acts as an intermediary that processes and condition-modifies data signals before transmission to the source driver. By inserting randomization circuits and transition control logic in the signal path, the system mediates between high-frequency operation requirements and EMI reduction goals
3Use of energy by moving object
If data encoding is performed to reduce transitions, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent divides the timing controller into functional modules including data encoding units, transition counting units, and randomization circuits. This segmentation allows each component to perform a specific function efficiently, reducing overall system complexity while achieving power consumption reduction through coordinated operation of these specialized units
Solution Approach 2:
The patent implements selective data encoding that applies transition reduction techniques only to portions of the data stream where beneficial, rather than encoding all data uniformly. This partial application of encoding reduces power consumption effectively while minimizing the added circuit complexity to only what is necessary for the most impactful data portions
Data Source
AI summary
Provided are display driving integrated circuits, display devices, and/or methods of operating the display driving integrated circuit. The display driving integrated circuit including a timing controller processing input data and outputting output data; and a source driving unit including at least one source driver and converting into analog data the output data received through a transmission channel connected to the timing controller and outputting the analog data as display data may be provided. The timing controller may include a data selecting unit comparing a transition count of the input data with a transition count of encoded data obtained by encoding the input data, and outputting one of the input data and the encoded data as selection data according to the comparison, a data randomizing unit randomizing the selection data and generating random data, and a data transmitting unit converting the random data into the output data may be provided.