Preface
An LED driver is an electronic device used to drive LED modules to emit light and ensure that LED module components can work properly. The conduction characteristics of LEDs determine that they have very strict requirements for power supply voltage and current, and a slight deviation may cause the LED to fail to light up, reduce the luminous efficiency, or even shorten the service life or damage the chip. Traditional power and common battery power supplies are not suitable for direct supply of LEDs, so the LED driver can ensure that the LEDs operate at the optimal voltage or current conditions.
LED driver chip is mainly used in TV to control the brightness of the screenLED backlight and the lighting time,It can realize the overall screen brightness control and local dimming,It can be said that the selection of LED driver chip will directly affect the picture performance of TV。 Recently, when the charging head network sorted out the previous dismantling cases, it was found that there are two 4KThe TVs have built-in high-performance LED driver chips to achieve high brightness and high image quality output.
The application of LED driver chips in TVs
Some of the specifications of the two LED driver chips that appear in the article are shown in the table, detailed information and application cases, and the charging head network will be introduced to you in detail below.
The core becomes IS31FL3731
The Chip IS31FL3731 is a compact LED driver that supports 144 matrix LED drivers, can be programmed via an I2C-compatible interface, is available in QFN-28 and SSOP-28 packages, operates at 2.7V~5.5V, and operates over a temperature range of -40°C to +85°C.
Application examples
SKYWORTH 4K OLED self-luminous wallpaper TV host
SKYWORTH's OLEDTV adopts a split design,The host and the screen are connected by wires,The screen can be extremely thin。 The host is connected to the power supply and display input interface, with built-in speakers and split design, which is more convenient to use. The TV host uses a glass panel, which is deep and beautiful, and has a more high-end feeling.
Related Reading:
Teardown report: SKYWORTH 4K OLED self-luminous wallpaper TV host
昂宝OB3350CP
The Off-OB3350CP is a cost-effective LED dimming controller that includes a PWM boost driver with current-mode control and fixed frequency in a SOP-8 package. The input voltage range of the chip is 8V~35V, the operating temperature range is -40°C to +85°C, and with MOS transistor and Schottky diode and inductor, it can be used for LED backlight boost driver of TV.
Application examples
Changhong 42-inch smart network TV 42P3F
Changhong's 42-inch smart network TV42P3F has a built-in 4K TV special chip、Stereo speakers,Both visual and auditory experience will be very good。 In addition, it also supports mobile games, wireless screen projection of movies, etc., to further enhance the entertainment experience.
Related Reading:
Teardown report: Changhong 42-inch smart network TV 42P3F built-in power supply
Summary of the charging head network
LED driver chips have become one of the key devices in TVs to improve display picture quality and enhance user experience. Choosing a high-performance LED driver IC can bring higher brightness, wider color gamut, and lower power consumption to your TV. The two high-performance LED driver chips mentioned in the article IS31FL3731 and Anbao OB3350CP can help manufacturers achieve precise dimming and improve the product experience.
The wide application of LED driver chips in TVs not only directly improves the picture quality and perception, but also brings more possibilities for the design and user experience of TVs. With the continuous iterative upgrading of display panel technology and the continuous innovation of LED driver chips, users can enjoy a better audio-visual experience in the future.