Method for driving light emitting diodes to display through multiplexing handheld device data bus

A light-emitting diode and data bus technology, which is applied in the field of multiplexing handheld device data bus to drive light-emitting diode display, can solve the problems of not being able to support lighting effects at the same time, increasing the difficulty of product design and the pressure of material preparation, etc.

Inactive Publication Date: 2010-06-23
SHANGHAI LONGCHEER TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The current LED lighting effects of mobile phones are generally completed by using LED driver chips. The interfaces are not all the same, which increases the difficulty of product design and the pressure of material preparation; in some special applications, such as but not limited to low-cost LED lighting mobile phones

Method used

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  • Method for driving light emitting diodes to display through multiplexing handheld device data bus
  • Method for driving light emitting diodes to display through multiplexing handheld device data bus
  • Method for driving light emitting diodes to display through multiplexing handheld device data bus

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Embodiment

[0019] Such as figure 1 As shown, the hardware part of the present invention multiplexes the data bus of the handheld device, such as but not limited to the LCM bus of the mobile phone, and the 18-way LED passes through the switch tube, such as but not limited to the MOSFET, and directly drives the MOSFET by the multiplexed 18-bit data bus. A total strobe signal CS is provided for these 18 LEDs, which can ensure that the LCM and LEDs are switched directly to each other.

[0020] Such as figure 2 As shown, the hardware connection method of the 16×2 LEDs is expanded from the hardware connection method of the 18 LEDs, and the 2 data lines are used as sub-chip selection signals CS1 and CS2, and the 32 LEDs are divided into two The groups are connected to the data bus in parallel, 16 LEDs are used as a group, the first group is strobed by the sub-chip select signal CS1, and the second group is strobed by the sub-chip select signal CS2; the first group of 16 LEDs is driven in the ...

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Abstract

The invention discloses a method for driving light emitting diodes (LEDs) to display through a multiplexing handheld device data bus, such as but not limited to a method for driving the LEDs through a mobile phone LCM bus. The method can realize various lighting effects of the LEDs, such as but not limited to water lamp, horse race lamp, breathing lamp and LED dot matrix effects and the like; the mobile phone LCM data bus is multiplexed, a free clearance of a designed bus is used for driving the LEDs which are connected to the bus in parallel, and a mobile phone baseband CPU sends information on images to be displayed to the LEDs through the LCM bus so as to realize various LED lighting effects, such as but not limited to 18-path LED, 16X2-path LED, 15X3-path LED, 9X9 LED matrix or 8X8X2 LED dot matrix effects; besides, the basic algorithms of software parts are similar to one another, and the method can reduce the cost of software drive to the minimum level without occupying additional GPIO ports of the CPU. Thus, the method has the advantages of convenient use, reduced cost and the like.

Description

technical field [0001] The invention relates to the technical field of mobile phones, in particular to a method for driving light-emitting diodes to display by multiplexing a data bus of a handheld device. Background technique [0002] The current LED lighting effects of mobile phones are generally completed by using LED driver chips. The interfaces are not all the same, which increases the difficulty of product design and the pressure of material preparation; in some special applications, such as but not limited to low-cost LED lighting mobile phones. [0003] The invention can reduce the cost of the hardware drive to the lowest degree, and does not occupy the GPIO port of the extra CPU. Contents of the invention [0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for multiplexing the data bus of the handheld device to drive the display of light-emitting diodes. The data bus of the multiplexing handheld devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02G09G3/32
Inventor 王小林杨恒陈鹏张征磊
Owner SHANGHAI LONGCHEER TECH CO LTD
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