Display Panel Data Driving Circuit With Delayed Analog Voltage Switching
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Solution Overview
Problem
Existing data driving circuits for liquid crystal display panels often damage due to the application of analog driving voltage without a corresponding digital driving voltage, leading to improper operation and potential chip damage.
Innovation Solution
A data driving method and circuit that sequentially apply a digital driving voltage followed by an analog driving voltage to the display panel, with a switching mechanism to ensure the analog voltage is only applied after a specific time has elapsed, preventing damage by blocking the analog voltage if the digital voltage is not applied correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If analog driving voltage is applied to data driving chip without preceding digital driving voltage, then device complexity is reduced, but reliability deteriorates due to chip damage
Solution Approach 1:
The patent applies preliminary action by sequentially enabling voltage sources - the digital driving voltage is applied first to power the digital circuits, and only after a predetermined time interval does the system enable the analog driving voltage. This time-sequenced activation ensures that digital circuits are fully operational before analog circuits are activated, preventing voltage-related damage while maintaining proper device initialization.
Solution Approach 2:
The patent introduces an intermediary control mechanism (timing control circuit or controller) that mediates between the digital and analog voltage sources. This intermediary component manages the temporal relationship between voltage applications, ensuring that the analog driving voltage is only applied after the digital driving voltage has been established for a predetermined duration, thereby protecting the chip from improper voltage sequencing.
2Reliability
If digital driving voltage is applied first followed by analog driving voltage after predetermined time, then reliability is improved, but device complexity increases due to switching control
Solution Approach 1:
The patent implements preliminary action through a timing-controlled voltage application sequence. The digital driving voltage is applied initially, and the system waits for a predetermined time interval before applying the analog driving voltage. This time-sequenced approach ensures proper initialization of digital circuits before analog circuits are activated, enhancing reliability while using straightforward timing control rather than complex switching mechanisms.
3Reliability
If analog driving voltage is blocked during abnormal digital voltage conditions, then reliability is improved, but productivity decreases due to extended initialization time
Solution Approach 1:
The patent applies preliminary action by establishing a fixed time interval between digital and analog voltage applications. This predetermined timing ensures that digital circuits are fully initialized before analog circuits are activated, providing reliable chip operation. The fixed timing mechanism balances reliability with productivity by avoiding excessive delays while ensuring proper voltage sequencing.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the status of digital voltage application and use this information to control when the analog voltage is applied. The system waits for a predetermined time after digital voltage is established, and this timing can be adjusted based on detected conditions. This feedback-based timing ensures reliable operation while optimizing the initialization time to maintain productivity.
Data Source
AI summary
In a data driving method for driving a display panel, a data driving circuit, and a display apparatus, the data driving method includes receiving a digital driving voltage and an analog driving voltage. The analog driving voltage is switched, after the digital driving voltage is received and a specific driving time elapses. A digital data signal is converted to an analog data signal using the analog driving voltage. The analog data signal is output to a data line of the display panel.