Predictive Power Control for LCD Panel Voltage Ripple
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Solution Overview
Problem
Conventional timing controller (TCON) bias integrated circuits (ICs) in LCD panels are passive and lack intelligence about future image data, leading to overdesign and increased costs due to inefficiencies in addressing sudden changes in current requirements during power delivery.
Innovation Solution
A Predictive Power Control (PPC) device within the TCON Bias IC utilizes future image data to proactively prepare output voltages by interacting with the PWM control block, generating a power regulator control signal to precharge the output voltage and adjust the duty cycle, thereby optimizing power delivery for future frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional passive TCON Bias ICs are used without future image data intelligence, then the system can be simpler in structure, but the power delivery efficiency deteriorates due to overdesign and inability to address sudden current requirements
Solution Approach 1:
The patent applies preliminary action by using future image data to predict upcoming power requirements and precharging the output voltage before the actual load demand occurs. The PPC device analyzes future frame image information during the current frame display, generates appropriate precharge signals, and activates the power regulator early to prepare the required voltage level, thereby avoiding sudden current surges and improving power delivery efficiency without requiring excessive overdesign capacity
Solution Approach 2:
The patent implements feedback by creating a closed-loop system where the PPC device continuously monitors future image data characteristics, predicts power requirements, generates control signals to the power regulator, and adjusts the precharge strategy based on the predicted load demands. This feedback mechanism enables adaptive power delivery that responds to actual image content requirements rather than using fixed overdesign margins
2Reliability
If overdesign is used to address sudden changes in current requirements, then the power delivery reliability is improved, but the system cost increases due to unnecessary extra components and capacity
Solution Approach 1:
The patent applies dynamics by transitioning from a static, fixed-capacity power delivery system to a dynamic system that adapts its output in real-time based on predicted future image content. The PPC device continuously adjusts the precharge voltage level and timing according to the actual power requirements of upcoming frames, allowing the system to maintain high reliability for sudden current changes while using only the necessary capacity rather than excessive overdesign
Solution Approach 2:
The patent implements parameter changes by modifying the power regulator's operating parameters (output voltage level, precharge timing, duty cycle) based on future image data analysis. The PPC device dynamically adjusts these parameters to match the predicted power requirements, enabling the system to maintain reliability across varying load conditions without requiring a fixed high-capacity design that would increase cost
3Stability of the object's composition
If proactive precharge is implemented using future image data, then the voltage ripple is reduced and current surges are avoided, but the device complexity increases due to the predictive control mechanism
Solution Approach 1:
The patent applies preliminary action by analyzing future image data during the current frame display period and generating precharge control signals before the predicted load demand occurs. This timing strategy allows the system to prepare the required voltage level in advance, smoothing out voltage ripples and preventing current surges when the actual load is applied, while utilizing the time available between frames for the predictive analysis
Data Source
AI summary
A Predictive Power Control (PPC) device within a TCON Bias IC that addresses an overdesign inefficiency and enables a low cost solution. A PPC block utilizes the next frame image data and interacts with a pulse width modulation (PWM) control block of internal regulators to proactively prepare the output voltages of a power regulator for the power requirements in one or more future frames, for example.