Display Pixel Compensation Timing for NIR Sensor Luminance Drift
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Solution Overview
Problem
The operation of an NIR proximity sensor in display devices causes luminance deviation due to leakage currents in transistors, leading to luminance changes in the display.
Innovation Solution
A display device with a gate driver including scan drivers and a light emission control signal driver, where each pixel has a driving transistor and a compensation transistor, and a bias transistor to control the driving current and threshold voltage, with specific bias voltage adjustments during NIR proximity sensor operation and non-operation periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an NIR proximity sensor operates, then proximity detection function is improved, but luminance deviation occurs due to leakage current in transistors
Solution Approach 1:
The patent applies preliminary action by turning on the compensation transistor before the sampling section to pre-compensate for threshold voltage shifts caused by NIR light exposure. This early compensation prevents luminance deviation before it occurs during normal display operation, resolving the contradiction between maintaining proximity detection functionality and ensuring display luminance consistency.
2Illumination intensity
If compensation transistor is turned on before sampling section, then luminance deviation is prevented, but additional control complexity is introduced
Solution Approach 1:
The patent merges the compensation transistor control with the existing scan signal timing by utilizing the first scan signal to control the compensation transistor. This integration approach incorporates the compensation function into the existing gate driver structure without requiring completely separate control circuits, thereby reducing additional complexity while maintaining luminance consistency.
Data Source
AI summary
Provided are a display device and a method of driving the same that prevent an operation of an NIR proximity sensor from affecting luminance change, and the display device includes a display panel including a plurality of pixels, and a gate driver including first to fourth scan drivers and a light emission control signal driver, wherein each of the pixels includes a driving transistor configured to control a driving current of a light-emitting element, and a compensation transistor configured to compensate for a threshold voltage of the driving transistor, each of the pixels is sequentially driven in a first bias section, an initialization section, a sampling section, a second bias section, and a light emission section during one frame, and a first scan signal is output so that the compensation transistor is turned on before the sampling section.