In-Cell Display Initialization for Screen Stability
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Solution Overview
Problem
In-cell type display apparatuses face issues with stable initialization operations, leading to screen shaking and touch sensing performance deterioration during display and touch sensing operations.
Innovation Solution
A display apparatus with a controller that performs initialization operations before and after both display and touch sensing operations, using time division to drive the panel during these operations, and includes a panel with gate lines, data lines, display pixels, and common electrodes, along with selectors to provide appropriate signals for initialization, data, and touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If initialization operation is performed only once per frame, then the operation sequence is simple, but screen shaking and touch sensing performance deterioration occur
Solution Approach 1:
The initialization operation is segmented into multiple distinct initialization operations: a first initialization operation performed before the display operation and a second initialization operation performed before the touch sensing operation. This segmentation allows each initialization to be optimized for its specific purpose, preventing screen shaking and touch sensing performance deterioration while maintaining operational simplicity
Solution Approach 2:
The initialization operations are performed in advance before the respective display and touch sensing operations. The first initialization is executed before the display operation to prepare the pixel capacitors for display, while the second initialization is executed before the touch sensing operation to prepare for accurate touch detection, thereby preventing performance deterioration
2Productivity
If display and touch sensing operations are performed simultaneously, then the operational efficiency is high, but mutual interference causes performance deterioration
Solution Approach 1:
The display operation and touch sensing operation are performed in periodic time-division manner within each frame period. The controller alternates between display operation during the first time period and touch sensing operation during the second time period, preventing mutual interference while maintaining high operational efficiency through systematic periodic switching
Solution Approach 2:
Before each touch sensing operation, a second initialization operation is performed to prepare the pixel capacitors and eliminate residual charges from the previous display operation. This preliminary action ensures accurate touch sensing by removing potential interference from the display operation
Data Source
AI summary
Disclosed herein is a display apparatus including a panel in which a display operation and a touch sensing operation occur during one frame, and a controller is configured to drive the panel during the display operation and the touch sensing operation. The controller performs an initialization operation during each of the display operation and the touch sensing operation. The initialization operation is performed (i) before a start of the display operation and/or after an end of the display operation, and (ii) before a start of the touch sensing operation and/or after an end of the touch sensing operation.