Display Power Control Stabilizing Sensing Reference Voltage
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Solution Overview
Problem
Sub-pixel luminance deviation compensation in display devices leads to unexpected image quality degradation, such as the 'block dim phenomenon', due to fluctuations in the sensing reference power used for converting analog voltage values to digital values.
Innovation Solution
A display device and power control system that includes an analog-to-digital converter connected to a sensing line within a sub-pixel, a timing controller for calculating data compensation, and a power generator that generates and controls the sensing reference power to ensure it remains within a predetermined range, thereby stabilizing the conversion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sub-pixel luminance deviation compensation is performed using sensing data converted from analog voltage values, then luminance uniformity across sub-pixels is improved, but image quality deteriorates due to block dim phenomenon caused by sensing reference power fluctuations
Solution Approach 1:
The patent applies parameter changes by regulating the sensing reference power voltage to maintain it within a predetermined range (e.g., 2.7V to 3.3V). The power control device monitors and adjusts the sensing reference power parameter to prevent fluctuations that cause block dim phenomenon, thereby resolving the contradiction between achieving luminance uniformity and maintaining image quality
Solution Approach 2:
The patent implements feedback control through a power control device that continuously monitors the sensing reference power and provides feedback to the power generator. When the sensing reference power deviates from the predetermined range, the feedback mechanism triggers regeneration of the power, ensuring stable operation and preventing image quality degradation while maintaining accurate sub-pixel luminance compensation
2Device complexity
If the sensing reference power is allowed to fluctuate to simplify power control, then device complexity is reduced, but measurement precision deteriorates due to inaccurate analog-to-digital conversion
Solution Approach 1:
The patent maintains measurement precision by establishing a predetermined voltage range for the sensing reference power (e.g., 2.7V to 3.3V). This parameter constraint ensures that the analog-to-digital conversion operates within optimal conditions, preventing inaccurate sensing data while avoiding overly complex power control mechanisms through reasonable parameter bounds
3Measurement precision
If the sensing reference power is regenerated frequently to ensure accuracy, then measurement precision is improved, but productivity decreases due to increased power consumption and processing time
Solution Approach 1:
The patent applies partial action by regenerating the sensing reference power only when necessary - specifically when it falls outside the predetermined range. This selective regeneration approach maintains measurement precision by correcting power deviations while avoiding excessive power regeneration that would reduce processing efficiency and increase power consumption
Data Source
AI summary
A display device and a power control device capable of preventing the degradation of image quality that may occur unexpectedly by performing the sub-pixel luminance deviation compensation. The display device can include an analog-to-digital converter, a timing controller, a power generator, and a power controller, among other components. The power control device can include a power generator and a power controller, among other components.