Display Pixel Sensing With Power-Voltage Bias Compensation
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Solution Overview
Problem
Display devices experience sensing errors due to changes in power voltage during real-time sensing, affecting the reliability of pixel characteristics measurement.
Innovation Solution
A display device with a pixel structure and driving method that includes a first transistor, a second transistor, a third transistor, and a storage capacitor, along with a data driver, sensing driver, and a controller, which adjusts bias voltage levels based on power voltage changes using reference voltage levels stored in a lookup table to maintain consistent sensing current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If real-time sensing is performed to measure pixel characteristics, then sensing speed and responsiveness are improved, but sensing accuracy deteriorates due to power voltage changes
Solution Approach 1:
The patent changes the bias voltage parameter dynamically based on the actual power voltage level during sensing. By adjusting the bias voltage to compensate for power voltage fluctuations, the sensing current is maintained at a stable level, thereby resolving the contradiction between fast real-time sensing and accurate measurement
Solution Approach 2:
The patent implements a feedback mechanism where the sensing operation takes into account the actual power voltage level and adjusts the bias voltage accordingly. This feedback loop ensures that sensing accuracy is maintained despite power voltage changes while preserving real-time sensing capability
2Illumination intensity
If power voltage is adjusted according to input image data to optimize display performance, then display quality is improved, but sensing reliability deteriorates due to voltage fluctuations
Solution Approach 1:
The patent applies preliminary anti-action by pre-adjusting the bias voltage in response to expected power voltage changes during sensing. By anticipating and compensating for voltage fluctuations before they affect sensing accuracy, the patent maintains both display optimization and sensing reliability
Solution Approach 2:
The patent dynamically changes the bias voltage parameter based on the relationship between input image data and actual power voltage. This parameter adjustment compensates for power voltage fluctuations caused by different display content, thereby maintaining sensing reliability while preserving display quality optimization
Data Source
AI summary
A display device includes a pixel that has a first transistor having a drain electrode that is connected to a first power voltage node and a source electrode that is connected to a second power voltage node, a second transistor connected between a data line and a gate electrode of the first transistor, and a third transistor connected between a sensing line and the source electrode of the first transistor, a data driver applying a bias voltage to the data line during a sensing period, a sensing driver sensing an electrical characteristic of the pixel through the sensing line during the sensing period, and a controller for adjusting the bias voltage according to the first power voltage according to input image data.