Driving circuit and display device
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Solution Overview
Problem
Mini LEDs in display devices often suffer from minor damages during manufacturing that are not easily detectable during lighting tests, leading to abnormal display issues and increased customer complaints or returns.
Innovation Solution
A driving circuit with a power control module and an output control module, including resistors and a switching control unit, that increases the test voltage during lighting tests to expose minor damages, thereby allowing for timely removal of defective products and improving shipment quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lighting test uses normal voltage, then the test is safe and does not cause additional damage, but minor damages to light boards cannot be easily found
Solution Approach 1:
The patent applies dynamics by making the test voltage adjustable rather than fixed. The driving circuit can dynamically switch between normal operating voltage and elevated test voltage based on the testing phase. During initial lighting tests, elevated voltage is applied to stress-test and reveal minor light board damages. Once potential issues are identified and addressed, the circuit operates at normal voltage for safe customer use. This dynamic voltage adjustment resolves the contradiction between needing high voltage for detection and low voltage for safety.
Solution Approach 2:
The patent changes the voltage parameter during different testing and operational phases. By implementing a driving circuit capable of outputting both normal voltage and elevated test voltage, the system can modify the electrical stress applied to light boards. This parameter change enables the detection of minor damages that would not manifest under normal operating conditions, while ensuring customer safety by limiting voltage to normal levels during actual product use.
2Reliability
If the driving circuit outputs only normal voltage, then customer safety is ensured, but defective products cannot be identified before shipment
Solution Approach 1:
The driving circuit is designed with multi-functionality to perform both normal operation and stress testing. The same driving circuit that operates the mini LED display during customer use also serves as the testing apparatus during manufacturing and quality control. By incorporating voltage adjustment capability into the standard driving circuit design, the system eliminates the need for separate testing equipment, reducing overall device complexity while enabling comprehensive product validation before shipment.
Solution Approach 2:
The patent implements preliminary action by conducting stress testing with elevated voltage before product shipment. The driving circuit applies higher than normal voltage during the testing phase to proactively identify defective light boards and potential reliability issues. This preliminary stress test reveals manufacturing defects that would not appear under normal operating conditions, allowing defective products to be filtered out before reaching customers, thereby improving product reliability without requiring complex additional testing equipment.
Data Source
AI summary
The present disclosure provides a driving circuit and a display device. An output control module of the driving circuit includes a first resistor, a second resistor, a third resistor, and a switching control unit. The switching control unit connected in series with the third resistor is connected in parallel with the second resistor, and then connected in series with the first resistor. During a first state, the switching control unit is turned off, and the driving circuit outputs a voltage Vout1. During a second state, the switching control unit is turned on, and the driving circuit outputs a voltage Vout2. An absolute value of Vout2 is greater than an absolute value of Vout1.