LCD Panel Driver Self-Masking Power-On Reset Signal
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Solution Overview
Problem
Conventional LCD panel drivers experience display failures during the initial power-on stage due to unknown signals being transmitted to the source lines before the source driver is fully stabilized, resulting in stripes on the display.
Innovation Solution
A liquid crystal display (LCD) panel driver with a self-masking function using a power-on reset signal, which generates a start pulse masking signal to prevent unknown image data from being displayed by masking the start pulse signal during the initial power-on stage, comprising a power-on reset signal generation unit, a latch unit, a counter unit, a level shifter, and an output buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the source driver is powered on immediately without stabilization, then power-on time is reduced, but unknown signals are transmitted to source lines causing display failures
Solution Approach 1:
The patent applies preliminary action by generating a power-on reset signal immediately when power is supplied to the source driver, before any image data transmission occurs. This reset signal is held in a latch unit and used to mask start pulse signals, ensuring the driver is properly initialized before operation begins, thus preventing display failures without delaying power-on timing
Solution Approach 2:
The patent introduces a latch unit as an intermediary component that receives and holds the power-on reset signal. This latch unit acts as a mediator between the power-on reset signal generation unit and the start pulse masking logic, enabling the system to detect power-on status and control signal transmission timing without adding significant delay to the power-on process
2Speed
If start pulse signals are transmitted immediately during power-on, then device operation speed is improved, but stripes appear on the display due to unstable signals
Solution Approach 1:
The patent applies preliminary anti-action by using the held power-on reset signal to mask (block) start pulse signals during the initial power-on period. This prevents unstable signals from being transmitted to the source lines before the driver is fully stabilized, eliminating stripe artifacts while allowing normal-speed operation once the driver is ready
Solution Approach 2:
The patent implements feedback by using the power-on reset signal, which is generated based on the actual power-on status of the source driver, to control the masking of start pulse signals. This feedback mechanism ensures that signal transmission is automatically enabled only when the driver has stabilized, preventing display artifacts without requiring external control
3Reliability
If a reset signal is used to mask start pulses, then display reliability is improved, but device complexity increases due to additional circuit components
Solution Approach 1:
The patent applies universality by designing the latch unit to serve multiple functions: it holds the power-on reset signal, generates control signals for masking start pulses, and provides status information to the masking logic. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in circuit complexity while maintaining improved display reliability
Data Source
AI summary
In a liquid crystal display (LCD) panel driver with a self-masking function using a power-on reset signal, and in a method of driving the same, the LCD panel driver includes a power-on reset signal generation unit that generates a power-on reset signal in response to a supply voltage applied to a LCD panel; a latch unit that receives a start pulse signal instructing that source lines of the LCD panel be driven and generates first and second set signals for setting an initial value of an output signal of a flip-flop to be in a predetermined default logic level, in response to the power-on reset signal; and a counter unit that generates a start pulse masking signal by masking at least one pulse of the start pulse signal in response to the first and second set signals and the start pulse signal.