Gate Driving Circuit for Display Apparatus with Horizontal Block Segmentation
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Solution Overview
Problem
In display apparatuses with touch screen interfaces, the deterioration of oxide thin film transistors during touch sensing periods leads to insufficient voltage for carry signals, reducing the reliability of touch reports due to the time-divisional driving method.
Innovation Solution
A gate driving circuit is implemented that divides the display area into horizontal blocks and includes holding stage groups to charge and output carry signals based on a holding voltage, minimizing transistor deterioration by reducing the time the precharging voltage is held.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the holding stage holds the output signal during the touch sensing period using oxide TFTs, then the touch report rate is enhanced to 120 Hz or higher, but the deterioration of the output TFT is accelerated causing insufficient carry signal voltage
Solution Approach 1:
The gate driving circuit is divided into multiple driving stage blocks, each containing an output TFT. By segmenting the circuit, the load on each individual output TFT is reduced, and the deterioration is distributed across multiple transistors rather than concentrated in a single device, thereby maintaining reliable voltage levels even during continuous touch sensing operations at high report rates
Solution Approach 2:
The holding stage is designed to hold the output signal during the touch sensing period in advance, preparing the carry signal before the next display period begins. This preliminary action ensures that when the touch sensing period ends and the next display period starts, the carry signal is already ready and maintains sufficient voltage level, preventing deterioration-related voltage insufficiency
2Length of moving object
If oxide TFTs are used in the stage circuit to realize thin bezel width, then the mobility is higher than amorphous TFTs, but the deterioration is not recovered reducing reliability
Solution Approach 1:
The circuit design incorporates specific voltage levels and timing parameters optimized for oxide TFT characteristics. By adjusting the operating parameters such as gate voltage levels, holding period durations, and signal transition timings, the circuit compensates for the irreversible deterioration of oxide TFTs, maintaining reliable performance while enabling thin bezel width through the use of high-mobility oxide TFTs
Data Source
AI summary
A display apparatus includes a display panel including a display area including a plurality of gate lines, a plurality of data lines, and a plurality of touch sensors, a gate driving circuit dividing the display area into a plurality of horizontal blocks and driving gate lines of a horizontal block by units of horizontal blocks at every display period in one frame, and a touch driving circuit sensing a touch through touch sensors of the horizontal block by units of horizontal blocks at every touch sensing period in the one frame.