Programmable Power IC Integrating EEPROM for LCD Driver
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Solution Overview
Problem
Conventional liquid crystal display (LCD) device driving circuits require multiple data writing processes, increasing processing time and costs due to separate data storage and communication functions in EEPROM and PPIC, leading to inefficiencies and higher costs.
Innovation Solution
A circuit that integrates a logic for physical communication and signal processing between the timing controller and PPIC, storing PPIC voltage setting data in an EEPROM, allowing the timing controller to read and transmit this data to the PPIC upon power application, thereby reducing operator intervention and data storage needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage setting data is stored separately in EEPROM and PPIC with separate writing processes, then data storage and communication functions are maintained, but the number of writing processes increases and processing time increases
Solution Approach 1:
The patent combines the voltage setting data storage function from EEPROM with the PPIC into a single integrated chip. The PPIC now includes both the power management functionality and the non-volatile memory for storing voltage setting data, eliminating the need for separate EEPROM chip and reducing the number of writing processes to a single operation.
Solution Approach 2:
The PPIC is transformed into a multi-functional device that performs both power management and data storage functions. By integrating the non-volatile memory into the PPIC, a single chip now handles both voltage regulation and storage of voltage setting data, reducing system complexity and processing steps.
2Ease of manufacture
If separate EEPROM and PPIC chips are used, then data storage and power management functions are separated, but device complexity and costs increase
Solution Approach 1:
The patent merges the separate EEPROM chip and PPIC chip into a single integrated PPIC chip that contains both the power management circuitry and the non-volatile memory for storing voltage setting data. This integration reduces the total number of chips from two to one, simplifying the device structure and reducing manufacturing complexity.
3Ease of operation
If operator writing processes are required for voltage setting data, then data can be stored in PPIC, but the number of writing processes increases and costs increase
Solution Approach 1:
The integrated PPIC with embedded non-volatile memory enables the system to automatically read and store voltage setting data without requiring external operator intervention for separate writing processes. The timing controller directly communicates with the integrated PPIC, allowing the system to self-configure the voltage settings.
Data Source
AI summary
A circuit for driving a liquid crystal display device includes a liquid crystal panel including a plurality of gate lines and data lines, a gate driver, a data driver, a memory for storing data necessary for operation of a timing controller and programmable power integrated circuit (PPIC) voltage setting data, the timing controller for reading and outputting the PPIC voltage setting data stored in the memory and reading the data necessary for operation of the timing controller stored in the memory and controlling the data driver and the gate driver, a PPIC for supplying a reference voltage, a gamma voltage and a common voltage to the data driver according to the voltage setting data supplied by the timing controller, and a power supply for receiving power from an external device and supplying power to each unit.