Consumer electronics products are mainly aimed at young consumers. In order to attract consumers, engineers always try to make the functions of the products more perfect and the appearance becomes more beautiful. However, in the case of high product cost transparency and short development cycle, how to improve the competitiveness of products has become a fact that researchers face. The current popular MP3/MP4, mobile phone and other consumer electronics products add a seven-color or multi-color backlight function is a very typical example, the cost is only a few LED (light-emitting diode) cost, but it has reached the product The operator interface is more beautiful and personalized.
Application range
The most typical color backlight applications are LCD backlights for MP3 products, backlights for cell phone keypads, and other products that require backlighting.
The traditional 7-color backlight design method, the realization method of the 7-color backlight, the hardware is as follows. Only three GPIO lines of the main controller are used to switch the three backlight LED tubes. It is easy to achieve changes in 7 colors.
Advantages: The implementation method is simple, and the hardware addition cost is low. Up to 7 colors of backlight display can be achieved.
Disadvantages: The brightness of the light cannot be adjusted; the current reaches 25~30mA when the three tubes are simultaneously turned on; the seven colors are too monotonous.
LED lighting control chip introduction
LPD6803 is a "Coloro Technology Development Co., Ltd." specially developed control driver chip for color display LED system, and the control is simple.
Function description:
a. Built-in oscillator, scanning does not need to rely on the control board to provide the scan clock.
b. 2 control lines, simple control and wiring.
c. It can control 3 LEDs, and 128 colors can be generated by register setting.
d. Due to the use of the intermittent characteristics of the human eye, PWM scanning is performed to make the actual required current smaller.
e. The chip is powered by a wide range of 3.3V~7V.
Multi-color LED backlight control design ideas
The LPD6803 costs around RMB 1. The low-power design meets the requirements of portable product design.
1. The effect that the design can achieve
A. Make the backlight brightness adjustable. 0-16 level backlight brightness adjustment.
B. Up to 128 backlight color displays.
C. Any display color, the overall current is kept within 10mA.
D. After writing a fixed register to the LP6803, the specified color display can be achieved. Does not account for software system resources.
2. Hardware design
Rigid PCB Assembly = Rigid Printed Circuit Board Assembly, which means the PCB Board is rigid. For rigid PCB , if need be SMT assembly by machine, just need to add tabs/boaders on the PCB board for assembly. Zhongfeng would manufacture the rigid PCB boards follow the design file, source the components follow the BOM file and do the PCB Assembly job follow the assembly drawing and the pick&place file. After PCB assembly done, the components would be mounted on the PCB boards tightly and connected each other through the copper circuits. We call such board as PCBA board or rigid custom PCBA board.
Depends on the components assembly types, it have THT PCB assembly, SMT PCB Assembly , one sided SMT and THT PCB assembly, two sided SMT and THT PCB assembly.
Depends on the PCB type, it have Rigid PCB assembly, Flex PCB Assembly and Flex-Rigid PCB Assembly.
Also we would call some PCB assembly types as Prototype PCB Assembly, Mass PCB Assembly , Turnkey PCB Assembly, LED PCB Assembly and BGA PCB Assembly , etc.
With our 15years professional experience, we are available for all types of PCB assembly service from prototype to mass production, available for 01005, 0201, 0.3mm BGA, 0.3mm QFP.
PCB Assembly Capabilities
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Quantity |
1 pcs - 1,000,000 pcs |
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Assembly type |
SMT, THT or Hybrid |
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Parts procurement |
Full turnkey (ZhongFeng provide all components) |
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Partial turnkey ( Customer provide the main components and ZhongFeng provide the rest) |
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Kitted (Customer provide all components) |
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Component types |
SMT 01005, 0201, BGA 0.3mm pitch, QFP 0.3mm pitch, etc. |
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Test |
Visual Inspection, AOI, Custom testing, ICT, FCT, Test jig |
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Rigid PCB Assembly
Rigid PCB Assembly,Rigid PCB Assembly Prototype,Rigid PCB Board Assembly,OEM Rigid PCB Assembly
ZhongFeng Electronic Technology Co., Limited , https://www.dopcba.com