Display Driver IC Internal Voltage Generation for OTP Noise
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Solution Overview
Problem
Display driver ICs with one-time programmable (OTP) functions experience noise due to leakage currents from pads used for OTP writing voltage, which are left floating after the writing operation, leading to inefficiencies and potential writing failures.
Innovation Solution
Incorporating a built-in internal voltage generating unit that supplies an internal voltage for OTP writing operations, eliminating the need for external voltage and thus preventing voltage drops and noise issues by using internal pads for both voltage generation and application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external voltage pads are used for OTP writing operations, then OTP writing can be performed, but noise due to leakage currents occurs and voltage drops happen
Solution Approach 1:
The patent extracts the harmful external voltage pad from the OTP writing circuit by introducing an internal voltage generating unit. This separates the voltage generation function from the external interface, eliminating the floating pad that causes noise and voltage drops while maintaining OTP writing capability.
Solution Approach 2:
The internal voltage generating unit enables the device to generate its own writing voltage internally without requiring external voltage pads. This self-service mechanism eliminates dependency on external voltage sources, preventing voltage drops and noise issues associated with external connections.
2Ease of operation
If external voltage pads are used for OTP writing, then writing operation is enabled, but pad area is wasted and efficiency is reduced
Solution Approach 1:
The patent removes the external voltage pad requirement from the OTP writing operation by implementing an internal voltage generating unit. This extraction eliminates the wasted pad area and improves device efficiency while preserving OTP writing functionality.
Solution Approach 2:
The internal voltage generating unit serves multiple functions: it generates writing voltage for OTP operations, eliminates the need for external voltage pads, and improves overall device efficiency. This multi-functionality resolves the contradiction between operational capability and efficiency.
3Productivity
If pads are left floating after OTP writing, then writing operation completes, but leakage currents cause noise
Solution Approach 1:
The patent extracts the floating pad issue by implementing an internal voltage generating unit that does not require external pads. This eliminates the source of leakage currents and associated noise while maintaining complete writing operation functionality.
Solution Approach 2:
The internal voltage generating unit provides self-contained voltage generation without external pad connections. This self-service approach ensures that no floating pads remain after writing operations, eliminating leakage currents and noise generation.
Data Source
AI summary
A display driver IC with a built-in memory device having a one-time programmable function is provided. The memory device includes: a cell array comprising a plurality of one-time programmable unit cells and configured to receive a writing voltage generated from an internal voltage generating unit to operate upon writing operation; a detecting unit configured to detect a change of the writing voltage; and a controlling unit configured to control the internal voltage generating unit and the unit cells according to an output signal of the detecting unit.