Display Device Reference Voltage Stabilization During Subpixel Sensing
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Solution Overview
Problem
In electroluminescence display devices, luminance deviations between subpixels occur due to variations in transistor characteristics, leading to image quality degradation, and existing technologies face challenges in stabilizing reference voltages during the sensing process, causing abnormal light emission.
Innovation Solution
A display device and driving method that include a gate driving circuit, data driving circuit, and timing controller to maintain a stable reference voltage by controlling scan transistors and reference voltage switches, ensuring the reference voltage line is turned off before sensing characteristic values, reducing light emission errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sensing process is performed to compensate transistor characteristic values, then image quality is improved, but light emitting element emits light abnormally during preparation process
Solution Approach 1:
The reference voltage line is turned off before the sensing process begins, preventing abnormal light emission during preparation. This preliminary action ensures that the reference voltage line does not cause harmful effects before the sensing operation is ready to proceed.
Solution Approach 2:
The reference voltage line is dynamically controlled to be turned off during the preparation process and turned on during the sensing process. This dynamic switching allows the system to adapt its state based on the operational phase, preventing abnormal light emission while enabling accurate sensing when needed.
2Measurement precision
If reference voltage line is turned on during sensing preparation, then sensing can proceed, but light emitting element emits light abnormally
Solution Approach 1:
The reference voltage line is turned off before sensing preparation to prevent abnormal light emission, and only turned on when actually needed for the sensing operation itself. This timing control separates the preparation phase from the active sensing phase.
Solution Approach 2:
The reference voltage line is turned off in advance during preparation to counteract the potential harmful effect of abnormal light emission before it can occur. This preliminary anti-action prevents the problem rather than correcting it afterward.
3Reliability
If scan transistor is turned on during sensing preparation, then circuit is ready for sensing, but reference voltage becomes unstable causing abnormal light emission
Solution Approach 1:
The reference voltage line is turned off before the sensing process to establish a stable baseline state. This preliminary action ensures that any drift or instability in the reference voltage does not cause abnormal light emission during the preparation phase.
Data Source
AI summary
Embodiments of the present disclosure relate to a display device comprising a display panel on which a plurality of gate lines, a plurality of data lines, a plurality of reference voltage lines, and a plurality of subpixels are disposed, a gate driving circuit providing scan signals to the plurality of gate lines, a data driving circuit providing data voltages to the plurality of data lines, and including at least one reference voltage switch for controlling reference voltages supplied to the plurality of reference voltage lines, and a timing controller controlling the gate driving circuit and the data driving circuit, and maintaining the reference voltage of the reference voltage line at a level of turning off a light emitting element while at least one scan transistor disposed on the plurality of subpixels is turned off before a sensing process for sensing a characteristic value of the plurality of subpixels is performed.