Display Device Semi-Off Switching Circuit for Rapid On-Process
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Solution Overview
Problem
The time required to perform the on-process of a display panel increases when a power-on signal is supplied during the off-process, especially due to the need for compensation processes for characteristic deviations in sub-pixel transistors, leading to prolonged driving times.
Innovation Solution
A display device and method that implement a semi-off process for a predetermined time when a power-off signal is supplied, allowing for a quick start process when a power-on signal is received within this period, by maintaining driving power and cutting off image data during the semi-off period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a full off-process is performed when power off signal is supplied, then the display panel can be fully reset and stabilized, but the time required for subsequent on-process increases significantly
Solution Approach 1:
The patent segments the power off process into two distinct modes: full off-process (traditional complete reset) and semi-off-process (partial reset maintaining power to data driving circuit). This segmentation allows the system to choose the appropriate process depth based on whether a power on signal is received during the semi-off period, thereby resolving the contradiction between reset stability and on-process time.
Solution Approach 2:
The patent implements preliminary action by performing a semi-off process that maintains power supply to the data driving circuit during the off period. This preliminary maintenance of circuit state prepares the system for rapid on-process activation when a power on signal is received, eliminating the need for complete re-initialization and thus reducing on-process time while still providing sufficient reset for display panel stability.
2Manufacturing precision
If compensation process for transistor characteristic deviation is performed, then the display quality is improved, but the total driving time is prolonged
Solution Approach 1:
The patent applies dynamics by making the compensation process conditional rather than static. The compensation for transistor characteristic deviation is performed only when necessary (i.e., when entering from full off state or when quality requirements demand it), and the system dynamically adjusts the extent of compensation based on the operational context, thus improving display quality without always incurring the full time penalty.
Solution Approach 2:
The patent changes the parameter of compensation depth by implementing different compensation strategies: full compensation when transitioning from power off state, and reduced or skipped compensation during semi-off to on transitions. This parameter adjustment allows the system to maintain display quality when needed while minimizing the impact on driving time during frequent power state transitions.
3Loss of energy
If the data driving circuit is fully powered down during off-process, then energy consumption is reduced, but the on-process time increases
Solution Approach 1:
The patent segments the power down process into selective power cutoff: during semi-off process, power is cut to most components but maintained for the data driving circuit. This segmentation enables the system to achieve energy savings from powering down unnecessary components while preserving the data driving circuit state for rapid on-process recovery, thus resolving the contradiction between energy consumption and on-process time.
Solution Approach 2:
The patent implements preliminary action by maintaining power supply to the data driving circuit in advance during the semi-off period. This preliminary preservation of circuit operational state ensures that when a power on signal is received, the circuit can resume operation immediately without requiring full power-up sequencing, thus reducing on-process time while still achieving energy savings from powering down other components.
Data Source
AI summary
A display device includes a display panel on which a plurality of sub-pixels are disposed; a timing controller configured to transmit an image control signal to a host system to receive image data from the host system; a data driving circuit configured to convert the image data transmitted from the timing controller into a data voltage and configured to supply the data voltage to the display panel; and a semi-off switching circuit configured to control the image control signal so that the image data is cut off from the host system during a semi-off period of a predetermined time from a time when an off monitoring signal is transmitted from the host system in response to the power off signal.