Electroluminescent Display Boosting Circuit Sensing Accuracy
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Solution Overview
Problem
Electroluminescent display devices face challenges in achieving luminance uniformity due to low sensing accuracy, leading to driving characteristic differences between pixels that deteriorate picture quality.
Innovation Solution
An electroluminescent display device is designed with a pixel including a driving element connected to a gate and source electrode, a sensing circuit to detect voltage changes in the readout line, and a boosting circuit or capacitor that couples voltage variations from the readout line to the data line, maintaining a stable gate-source voltage during sensing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing circuit is used to detect voltage changes for compensation, then driving characteristic differences can be compensated, but sensing accuracy is insufficient to achieve good luminance uniformity
Solution Approach 1:
A boosting circuit is introduced as an intermediary component between the data line and readout line. This boosting circuit includes a boosting capacitor that temporarily stores and transfers voltage changes, enabling accurate sensing of voltage variations without direct coupling. The intermediary boosting circuit allows the sensing circuit to detect driving characteristic differences with high precision, resolving the contradiction between sensing accuracy and luminance uniformity.
2Device complexity
If the gate electrode is directly connected to the data line and source electrode to the readout line, then the circuit is simple, but voltage changes during sensing operation cause inaccurate pixel current measurement
Solution Approach 1:
The boosting circuit acts as a mediator that decouples the direct voltage change path from the sensing path. By introducing the boosting capacitor between the data line and readout line, the circuit maintains simplicity while enabling accurate pixel current measurement through temporary voltage storage and transfer during sensing operations.
Solution Approach 2:
The boosting capacitor performs preliminary action by temporarily storing voltage changes before transferring them to the readout line. This preliminary voltage transfer ensures that the sensing circuit receives accurate voltage information without direct coupling, improving pixel current measurement precision while maintaining circuit simplicity.
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
This configuration enhances sensing accuracy and compensation performance by maintaining a constant gate-source voltage, thereby improving luminance uniformity and overall picture quality.
Implementation Method 1
a boosting capacitor electrically coupled between the data line and the readout line, the boosting capacitor configured to couple the changed voltage of the readout line to the data line during the sensing operation
Data Source
AI summary
An electroluminescent display device according to an embodiment of the present disclosure includes a pixel including a driving element having a gate electrode connected to a data line and a source electrode connected to a readout line, a sensing circuit configured to sense a voltage of the readout line which changes according to a pixel current flowing through the driving element during sensing operation, and a boosting circuit connected between the data line and the readout line and configured to change a voltage of the data line according to the changed voltage in the readout line during the sensing operation.