Display Driver Power Stabilization via Load Mitigation
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Solution Overview
Problem
Display devices with integrated touch sensors experience periodic load variations between display and non-display periods, leading to power output ripples and noise due to the inability of booster circuits or regulator circuits to keep up with these variations.
Innovation Solution
A display device with a control unit that manages the display and power supply units to mitigate load differences between display and non-display periods, using dynamic control of the regulator and booster circuits to stabilize power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch sensor is operated in a blanking period of liquid crystal driving, then the touch sensing function is enabled, but a periodic load variation occurs causing ripple in power supply voltage
Solution Approach 1:
The invention applies preliminary action by pre-charging the capacitor during the non-display period before the display period begins. This advance preparation ensures that when the display period starts and the load increases, the capacitor is already charged and can immediately supply the required current, preventing voltage ripple. The control circuit proactively manages the capacitor charging timing to anticipate the upcoming load variation.
Solution Approach 2:
The invention implements dynamics by dynamically adjusting the operating mode of the capacitor between the display period and non-display period. During the non-display period, the capacitor is charged to a higher voltage level, while during the display period, it supplies current to the touch sensor. This dynamic switching of capacitor operation modes allows the system to adapt to periodic load variations and maintain stable power supply voltage.
2Productivity
If the display device repetitively exhibits display period and non-display period, then the display and touch sensing functions are achieved, but load variation causes ripple in power output
Solution Approach 1:
The invention uses the capacitor as an intermediary energy storage element between the power supply and the display/touch sensor load. The capacitor acts as a buffer that absorbs power during the non-display period and releases it during the display period, mediating the periodic load variations. This intermediary component smooths out the power output ripple and reduces noise generated by the repetitive display and sensing operations.
3Ease of operation
If the booster circuit or regulator circuit is used for liquid crystal driving, then the liquid crystal display function is enabled, but the circuit cannot catch up with load variation
Solution Approach 1:
The invention uses a capacitor to create a simplified copy of the power supply function, specifically for handling rapid load variations. Instead of relying on the complex booster or regulator circuits to respond to every load change, the capacitor provides a direct, immediate response by storing and releasing energy. This capacitor-based power delivery mechanism acts as a faster, simpler copy of the main power supply function for handling transient load demands.
Data Source
AI summary
According to one embodiment, a display device includes a display unit and a driver unit. The driver unit includes a display drive unit, a power supply unit and a control unit. The control unit instructs a display period in which the image is displayed in the display unit and a non-display period in which the image is not displayed to the display drive unit, and instructs mitigation driving which mitigates a difference in an electrical load of the display drive unit between the display period and the non-display period to the power supply unit in the non-display period.