Sensing Device for Electroluminescence Display ADC Compensation
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Solution Overview
Problem
Existing electroluminescence display devices face brightness deviations due to variations in driving characteristics between pixels, which are exacerbated by temperature-sensitive analog-to-digital converter (ADC) output characteristics, limiting image quality and compensation performance.
Innovation Solution
A sensing device that simultaneously senses both the driving characteristics of pixels and the output characteristics of the ADC in a single sensing sequence, using a configuration with sampling capacitors, switches, and reference voltages to enhance compensation capability and reduce manufacturing costs and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external compensation technology is used to sense driving characteristics of pixels, then brightness deviation between pixels is compensated, but compensation performance is degraded due to temperature-sensitive ADC output characteristics
Solution Approach 1:
The patent introduces a feedback mechanism by sensing the ADC output characteristics and using this information to correct the pixel driving characteristics compensation. The sensing unit measures the ADC output at different reference voltages, and the controller uses this feedback to calculate compensation values that account for temperature-induced ADC variations, thereby maintaining stable compensation performance across temperature changes
Solution Approach 2:
The patent changes the operating parameters of the ADC by applying different reference voltages (first reference voltage and second reference voltage) during sensing operations. By measuring the ADC output characteristics at multiple voltage levels and analyzing the changes, the system can detect temperature-induced variations and compensate for them, thus resolving the reliability issue caused by temperature sensitivity
2Reliability
If ADC output characteristics are sensed to compensate for temperature variations, then compensation performance is enhanced, but device complexity increases
Solution Approach 1:
The patent makes the sensing unit multi-functional by enabling it to perform both pixel driving characteristic sensing and ADC output characteristic sensing using the same hardware components. The sensing unit can operate in different modes: one mode for sensing pixel characteristics and another mode for sensing ADC characteristics, thus enhancing compensation performance without significantly increasing device complexity
Solution Approach 2:
The patent merges the ADC output sensing function with the existing pixel sensing function into a single integrated sensing operation. By combining these functions into one unified sensing sequence that uses shared hardware resources (sensing unit, controller, and existing circuitry), the system enhances compensation capability while minimizing the increase in device complexity
3Measurement precision
If separate sensing operations are used for pixel characteristics and ADC characteristics, then sensing accuracy is maintained, but sensing time increases
Solution Approach 1:
The patent employs periodic action by implementing a dual-mode sensing operation that alternates between pixel characteristic sensing and ADC characteristic sensing within a single sensing sequence. The controller periodically switches between the two sensing modes, allowing both types of measurements to be completed in an integrated timeframe rather than requiring separate operations, thus reducing total sensing time while maintaining accuracy
Solution Approach 2:
The patent merges two separate sensing operations (pixel sensing and ADC sensing) into a single integrated sensing sequence. By combining these operations so that they execute in sequence within one timing cycle and share common hardware resources, the system maintains the measurement precision of both operations while reducing the overall sensing time compared to performing them as completely separate operations
Data Source
AI summary
Disclosed herein is a sensing device including a sensing channel terminal connected to a pixel through a sensing line, a first power terminal to which a displaying reference voltage is input, a second power terminal to which a sensing reference voltage different form the displaying reference voltage is input, a third power terminal to which a sampling reference voltage is input, a sampling capacitor having a first electrode to which the sampling reference voltage is applied, a sensing set-up switch connected between the second power terminal and the sensing channel terminal, a first sampling switch connected between the sensing channel terminal and a second electrode of the sampling capacitor, and a second sampling switch connected between the first power terminal and the second electrode of the sampling capacitor.