Touch Display Sleep Driving Circuit Power Management
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Solution Overview
Problem
In electronic devices with integrated touch modules and display panels, entering a sleep state to reduce power consumption is hindered by the need for continuous black screen display, which prevents the touch module from functioning and increases electricity consumption.
Innovation Solution
A touch display apparatus with a touch display panel, gate driver, and sleep driving circuit that allows the display to be turned off while the touch module continues to operate by using a control circuit to enable a gate turn-off signal, turning off shift registers during display periods and providing driving pulses through a sleep driving circuit during touch sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display apparatus continuously displays a black screen during sleep state, then the touch module can operate, but electricity consumption cannot be lowered
Solution Approach 1:
The patent segments the display panel into two independent functional parts: the display portion (pixels, data lines) and the touch portion (touch sensors, gate lines). By segmenting the driving circuits into separate display driving circuits and touch driving circuits, the system can independently control each part. During sleep state, the display driving circuits are turned off while the touch driving circuits remain operational, enabling touch functionality without continuous display output, thus reducing electricity consumption while maintaining touch module operability.
2Use of energy by moving object
If the display apparatus enters sleep state with display turned off, then electricity consumption is reduced, but the touch module cannot operate
Solution Approach 1:
The patent implements preliminary action by maintaining the operational state of the touch driving circuitry before the sleep state is fully engaged. The touch driving circuits are designed to remain active or be quickly activatable during sleep state, ensuring that the touch module is ready to respond to user interactions immediately when needed, without requiring the display to be fully powered on first.
Solution Approach 2:
The patent applies dynamics by creating a flexible power management system that can dynamically adjust the operational states of different circuit components based on the current mode (normal operation or sleep state). The control circuit dynamically switches between different driving modes, allowing the display to be off while touch functionality remains enabled, and can quickly transition between these states based on user needs.
3Use of energy by moving object
If the shift registers are turned off during sleep state, then power consumption is reduced, but gate driving signals cannot be provided
Solution Approach 1:
The patent extracts the gate driving function from the traditional shift register-based system and implements it through a dedicated sleep driving circuit. This extracted function operates independently of the main shift register chain, allowing gate driving signals to be generated and provided to the touch sensors even when the main display driving circuits and shift registers are turned off during sleep state, thus maintaining productivity while reducing power consumption.
Data Source
AI summary
A touch display apparatus including a touch display panel and a control circuit is provided. The touch display panel includes a touch display array, a gate driver, and a sleep driving circuit. The gate driver is coupled to the touch display array to sequentially provide a plurality of gate driving signals. The sleep driving circuit is coupled to the touch display array. The control circuit is coupled to the gate driver and the sleep driving circuit. When the touch display apparatus enters a sleep state, the sleep driving circuit is turned on. The control circuit cuts off the gate driver during a display period and transmits a driving pulse to the touch display array through the sleep driving circuit during a touch sensing period.