Display Driving IC Temperature Compensation Adaptive Scaling
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Solution Overview
Problem
Organic light emitting display devices experience increased power consumption due to overcurrent flow when the device temperature or surrounding environment temperature rises.
Innovation Solution
A display driving integrated circuit is developed, incorporating a compensation circuit with an analog-to-digital converter, a logic circuit that generates a scaling factor based on temperature and current data, and a data driving circuit that adjusts image data voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If temperature compensation is implemented to control overcurrent, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent combines the temperature sensor, analog-to-digital converter, scaling factor generation logic, and data driving circuit into a single integrated circuit. This merging of multiple functional components into one chip reduces the overall system complexity while maintaining the temperature compensation functionality to control overcurrent and reduce power consumption.
Solution Approach 2:
The patent introduces a scaling factor as an intermediary parameter that mediates between the temperature compensation signal and the final driving current. The logic circuit generates this scaling factor based on temperature data and image data, which then modulates the data driving circuit's output. This intermediary mechanism allows smooth, controlled power reduction without abrupt changes that would increase system complexity.
2Loss of energy
If adaptive scaling is implemented to control current, then overcurrent is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent dynamically changes the driving parameters (scaling factor) based on real-time temperature and image data conditions. Instead of relying on fixed manufacturing precision for current control, the system adapts the current magnitude through software-generated scaling factors that adjust the data driving circuit's output according to actual operating conditions, thereby reducing overcurrent without demanding extreme manufacturing precision.
Solution Approach 2:
The patent implements a feedback mechanism where the temperature sensor continuously monitors the display device temperature, and the logic circuit uses this feedback to generate appropriate scaling factors. The analog-to-digital converter provides feedback on the reference voltage line conditions. This closed-loop feedback system compensates for manufacturing variations and ensures precise current control without requiring ultra-precise manufacturing tolerances.
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 integrated circuit effectively controls overcurrent flow in display devices, reducing power consumption and maintaining stable operation even under elevated temperatures.
Implementation Method 1
an analog-to-digital converter configured to convert an analog sensing voltage into a digital sensing value
Data Source
AI summary
A display device includes a display panel, a compensation circuit, a global temperature sensor, a global current sensor, a logic circuit, a timing controller, and a data driving circuit. The compensation circuit converts a sensed analog sensing voltage from a reference voltage line of a pixel of the display panel into a digital sensing value. The global current sensor measures an amount of current flowing through the display panel to generate a global current value. The logic circuit generates a scaling factor based on temperature data of the global temperature sensor, the global current value, the digital sensing value, and first image data. The timing controller scales first image data based on the first scaling factor to generate second image data. The data driving circuit that generates a data voltage based on the second image data for driving the data line.