Since the LED is a current-characteristic device, that is, under the premise of saturation conduction, its brightness changes with the magnitude of the current, and does not change with the voltage across it. Therefore, one of the biggest features of a dedicated chip is to provide a constant current source. The constant current source can ensure the stable driving of the LED and eliminate the flickering phenomenon of the LED. The following will focus on the problems with the dedicated driver chip for LED displays.
Problem
1, power consumption and heating problems
Due to the large output current, the power consumption and heat generation of the LED display chip have always been the first factor hindering the development of the driver chip. This problem will become more prominent in the way that handheld LED displays may appear in the future. As the level of LED device manufacturing processes advances and the drive current decreases, the problem is gradually resolved.
2, the application cost problem
A mainstream 16-bit steady-state current LED display driver chip can only drive 16 LED devices. A LED display with a resolution of 1024×768 must use multiple driver chips to achieve the desired results, which makes the material cost relatively high. If the driver chip itself is scanned, then a mainstream driver chip can drive multiple LED devices at a time, which will reduce the application cost.
to sum up:
Judging from the product structure of these LED driver chip manufacturers, the current mainstream chips are mainly divided into three grades. The first grade is a chip with a gray scale mechanism. This type of chip has a PWM function inside, which can generate gray scale according to the input data, and is more likely to form deep gray scales and display high quality images. The second grade is a chip with output open-circuit detection (LOD), temperature over-temperature protection (TSD), and brightness adjustment. These chips are more suitable for specific applications due to additional functions, such as for variable information boards. It has the ability to detect LEDs. The third file is a constant current source chip without any additional functions. This type of chip only provides a constant current source for the LED, ensuring good display quality of the screen.
A small safety part in an automobile electrical device or piece of machinery that causes it to stop working if the electric current is too high, and so prevents fires or other dangers. Fuse, also known as current fuse, is defined by the IEC127 standard as "fuse-link". It is mainly an overload protection. If the fuse is properly installed in the circuit, the fuse will cut off the current and protect the circuit safe operation when the current abnormal is raised to a certain height and heat. Invented by Edison fuse is used to protect more than one hundred years ago when the expensive incandescent bulbs, along with the development of The Times, the fuse protection power equipment is not trained in current overheat damage, avoid electronic equipment serious damage caused by internal fault. When a circuit breaks down or is abnormal, the current increases with the current and the increased current may damage some important components in the circuit, and it may also burn the circuit and even cause a fire. If correctly placed in the circuit fuse, the fuse will be abnormal current increases to a certain height and heat, its own fuse to cut off the current, so as to protect the safe operation of the circuit.
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