Panel Driver IC Cooling via Data-Voltage Pattern Rearrangement
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Solution Overview
Problem
Conventional panel driver integrated circuits experience significant temperature increases due to the level shifter and output buffer, leading to altered circuit characteristics and reduced reliability, as they generate excessive heat during data and voltage transitions.
Innovation Solution
A panel driver IC with a data encoder, level shifter, digital-to-analog converter, and rearrangement circuit that analyzes and adjusts the relationships between data transition patterns and voltage transition patterns to reduce current and power consumption, thereby lowering the IC's temperature by interchanging patterns between high and low temperature regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the level shifter and output buffer operate with wide voltage swing and high data transition, then the driving capability is improved, but the temperature of the panel driver IC rises drastically
Solution Approach 1:
The patent dynamically adjusts the voltage swing parameter of the output buffer based on the activity level of the level shifter. When the level shifter exhibits high transition activity (generating excessive heat), the output buffer's voltage swing is reduced to a lower range, thereby decreasing its power consumption and heat generation. This parameter adaptation resolves the contradiction by allowing the system to maintain adequate driving capability while preventing temperature escalation under high-stress conditions.
Solution Approach 2:
The patent implements dynamic control mechanisms where the output buffer's operating parameters are continuously adjusted according to the real-time activity level of the level shifter. The system transitions from a static operating state to a dynamic one, where the voltage swing and current drive are modulated based on the instantaneous data transition patterns. This dynamic adaptation enables the system to optimize the trade-off between driving capability and temperature control.
2Power
If the voltage swing of the output buffer is increased to improve signal drive, then the output capability is enhanced, but the buffer temperature increases excessively
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the output buffer's voltage swing range according to the level shifter's activity level. When the level shifter generates high heat due to extensive data transitions, the output buffer operates with a reduced voltage swing (e.g., limited to specific grayscale voltage ranges instead of full swing from lowest to highest). This parameter adaptation maintains sufficient output capability for normal operation while significantly reducing the buffer's power dissipation and temperature rise during high-activity periods.
3Productivity
If data transitions from 00000000 to 11111111 occur in the level shifter, then the data processing capability is demonstrated, but both the level shifter and output buffer generate high temperature simultaneously
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the output buffer's voltage swing parameter based on the detected data transition activity in the level shifter. When a high-activity transition pattern (such as 00000000 to 11111111) is detected in the level shifter, indicating maximum data processing capability demonstration, the system automatically reduces the output buffer's voltage swing to a lower range. This coordinated parameter adjustment ensures that while the level shifter maintains its data processing capability, the output buffer's power consumption and heat generation are curtailed, preventing simultaneous high-temperature conditions in both components.
Data Source
AI summary
A panel driver integrated circuit (IC) and a cooling method of the panel driver IC are provided. The panel driver IC includes a data encoder, a level shifter, a Digital-to-Analog Converter (DAC), a rearrangement circuit and an output buffer. The data encoder receives and selectively changes an original data for outputting to the level shifter. An input terminal and an output terminal of the level shifter are coupled to an output terminal of the data encoder and a data input terminal of the DAC, respectively. The output terminals of the rearrangement circuit are respectively coupled to the reference voltage input terminals of the DAC for providing different reference voltages. The rearrangement circuit correspondingly rearranges the order of the reference voltages according to the operation of the data encoder. An input terminal of the output buffer is coupled to an output terminal of the DAC.