Gate Driver Circuit Pre-Charging for Concurrent Pixel Sensing
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Solution Overview
Problem
Existing gate drivers in display devices emit light during sensing modes, which can be undesirable and limit the timing of sensing operations, and they do not efficiently sense a large area in a short time due to sequential scanning of pixels.
Innovation Solution
A gate driver circuit that pre-charges a node to a high potential voltage before sensing mode, allowing concurrent selection of multiple scan lines and bypassing the light-emitting element to prevent light emission, enabling simultaneous sensing of a greater number of pixels in a shorter time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing is performed during display operation, then real-time compensation is achieved, but light is emitted during sensing which is undesirable
Solution Approach 1:
The gate driver performs pre-charging of the M node before sensing operation to ensure proper voltage levels are established, allowing sensing to be performed without causing unwanted light emission from the OLED. This preliminary action prepares the circuit state necessary for non-intrusive sensing.
2Device complexity
If sequential pixel sensing is used, then circuit complexity is low, but sensing time is too long
Solution Approach 1:
The gate driver merges multiple scan line sensing operations by concurrently selecting multiple scan lines through the M node pre-charging mechanism. This allows multiple pixels to be sensed simultaneously rather than sequentially, reducing total sensing time while maintaining circuit simplicity.
Solution Approach 2:
By pre-charging the M node before sensing, the gate driver prepares the voltage state that enables concurrent selection of multiple scan lines. This preliminary voltage preparation allows parallel sensing operations without requiring complex additional circuitry.
3Device complexity
If M node is not pre-charged, then circuit operation is simple, but multiple scan lines cannot be concurrently selected
Solution Approach 1:
The gate driver pre-charges the M node to a high potential voltage before sensing mode operation. This preliminary charging action enables the concurrent selection of multiple scan lines by providing the necessary voltage drive capability, thereby increasing sensing speed without significantly complicating the circuit.
Data Source
AI summary
The present disclosure is directed to a gate driver circuit configured to prevent a light-emitting element of a display device from emitting light in a sensing mode. The gate driver circuit allows a plurality of scan lines of the display device being concurrently sensed by pre-charging a node of the gate driver circuit prior starting a sensing mode. The present disclosure provides the benefit of sensing a greater number of pixels of a display in a shorter time while also ensuring that a sufficient charge is provided by the pre-charged node for a plurality of pixels of the plurality of scan lines to be sensed concurrently.