Display Driver ADC Input Range Correction
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Solution Overview
Problem
The existing analog-digital converters in display devices face difficulties in performing normal conversion on pixel sensing signals when their signal range exceeds or falls outside the converter's input range, and are affected by deviations in reference voltages due to process deviations, leading to inaccurate signal processing.
Innovation Solution
A driver for display devices is designed with an input signal converter that adjusts the signal range of pixel sensing signals to fall within the analog-digital converter's input range using control signals, and an input range converter that compensates for deviations in reference voltages by changing the reference voltages, ensuring accurate analog-digital conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel sensing signal range (18V to 24V) is used directly as input to the analog-digital converter, then the full sensing range is utilized, but the converter cannot properly process signals outside its input range (0.4V to 1.4V), causing data loss
Solution Approach 1:
An input signal converter is introduced as an intermediary component between the pixel sensing signal source and the analog-digital converter. This converter transforms the high-voltage pixel sensing signal (18V to 24V) into a low-voltage signal (0.4V to 1.4V) that matches the ADC's input range, enabling accurate conversion without data loss while preserving the full sensing capability.
Solution Approach 2:
The patent changes the voltage parameter of the pixel sensing signal through the input signal converter, transforming it from a high-voltage signal (18V to 24V) to a low-voltage signal (0.4V to 1.4V) that is compatible with the ADC's input requirements, thereby resolving the range mismatch problem.
2Stability of the object's composition
If the input range of the analog-digital converter is fixed at 0.4V to 1.4V, then the converter operates within stable parameters, but it cannot accommodate variations in pixel sensing signal ranges under different driving voltages
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism where the input signal converter adapts its conversion parameters based on the actual pixel sensing signal range. This allows the system to maintain stable ADC operation while accommodating variations in signal ranges under different driving voltage conditions (e.g., 18V to 24V), achieving both stability and adaptability.
3Stability of the object's composition
If reference voltages VT and VB are fixed during manufacturing, then the analog-digital converter operates with stable parameters, but process deviations cause input range deviations that lead to inaccurate signal processing
Solution Approach 1:
The patent implements a feedback mechanism where the actual input range of the analog-digital converter is measured and compared against the target range. Based on this feedback, the input signal converter adjusts its conversion parameters to compensate for deviations caused by process variations in reference voltages VT and VB, thereby maintaining accurate signal processing despite manufacturing tolerances.
Data Source
AI summary
A driver of a display device is disclosed. In order to solve a signal processing error likely to occur in an analog-digital converter which processes a pixel sensing signal provided from a pixel of a display panel, the pixel sensing signal is converted, or an input range of the analog-digital converter is corrected.