CN103854610A

CN103854610A - Novel energy consumption reduction technology of LED display screen

Info

Publication number: CN103854610A
Application number: CN201210503616.1A
Authority: CN
Inventors: 吴骏豪
Original assignee: SHANGHAI RUBAO ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: SHANGHAI RUBAO ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2012-12-01
Filing date: 2012-12-01
Publication date: 2014-06-11

Abstract

A 32-channel iW7032-type LED driver produced by them is adopted to design different solutions for an edge-lit LED backlight high-definition LCD TV and a direct-lit LED backlight high-definition LCD TV. The driver adopts the technology called by the iWatt company as adaptive switching, such that the energy consumption and working temperature of devices are reduced. Gathering of a large number of drives causes a cooling problem of an LED chip. In order to overcome the problem, the adaptive switching technology can detect different LED lamp strings whose positive voltage is not matched, and the driving current of each lamp string can be adjusted independently. With the technology, energy consumption of the driver is 2 to 5w lower than that of the product from a competitive company. According to the adaptive switching technology, through prolonging the sub service life of each LED group sequentially, dual purposes of electric energy conservation and heat generation reduction can be achieved. One iW7032 driving chip can drive altogether 480 LED chips through a superimposed voltage up to 56 volt. The driver also integrates a field effect transistor to control the output current of each lamp string. In order to control the brightness of the LED lamp strings, the integrated circuit of the driving chip supports three different pulse time modulation (PMW) schemes at10 bit intervals.

Description

LED display reduces the new technology of energy consumption

" by superior failure protection function is provided, HV9957 driver provides the LED driver accurately that can process various complex faults in independent LED lamp string for equipment manufacturers." " HV9957 also has advanced digital circuit, thereby frequency control function, failure protection function and phase dimming function can be provided.In LED-backlit of today source drives, these functions make low duty ratio and high dynamic range become controlled.”

In order to control accurately each LED lamp string, independently low pressure difference linear voltage regulator (LDO) of boost converter switch that HV9957 is integrated and six.Driving circuit can provide the electric current of 30 milliamperes for each LED lamp string, and this is a kind of typical battery powered Design Mode.

Hope can be applied to its novel TSL2x72 series of products in computer monitor and high-definition liquid crystal TV, but at present the product of TSL2x72 family mainly for the mobile device such as smart mobile phone, panel computer.

New product comprises TSL2572 series digit type ambient light sensor (ALS), TSL2672 series proximity transducer and simultaneously comprise the TSL2772 series of products of light sensor and proximity transducer.In order to meet the demand of mobile device, sensor must also can be worked under high light.Adapt to this demand, the new product of company design meets or exceeds in brightness under the sufficient solar radiation environment of 60000 luxs and still can normally use." mobile device suppliers constantly make great efforts to provide more compellent product to improve user's experience, and therefore they need the solution of light detection and proximity detection, enable under lighting condition, working widely.”

Taos adopts programmable signal gain pattern, comprises a reduced gain, thereby improves the dynamic range of optical sensor.Meanwhile, improve signal to noise ratio (S/N ratio), and adopt interference compensation technology, approach and survey thereby provide more accurately.This detector of two types can both still can sporadicly use in the time keeping sleep state, thereby energy consumption is dropped to minimum.It is particularly important that this function seems in battery powered equipment.

This sensor can be surveyed the light source of any type of the nearly all light intensity including fluorescent light.In addition, even if the structure of duodiode has also ensured to be arranged on after glass, be detected light may be by glass distortion in the situation that, detector also can obtain result accurately.

Different solution that to adopt 32 passage iW7032 type LED drivers that they produce be side-light type (edgELit) LED-backlit high-definition liquid crystal TV and straight-down negative (directlit) LED-backlit high-definition liquid crystal television design.Driver has adopted the technology that is referred to as self-adaptation switching (adaptiveswitching) by iWatt company, and device power consumption and working temperature are all reduced." drive a large amount of gathering to cause LED chip heat dissipation problem, by overcoming this difficulty, self-adaptation handoff technique can detect the unmatched different LED lamp of forward voltage string, and the drive current of the each lamp string of independent adjusting.This technology can make the low 2-5 watt of product of driver energy loss-rate rival firms.Self-adaptation handoff technique, by extending successively the each component of the LED life-span, reaches the dual purpose of saving electric energy and reducing heat generation.

An iW7032 driving chip can be by driving 480 LEDs chips altogether up to the superimposed voltage of 56 volts.This driving is also integrated, and field effect transistor is controlled the output current of each lamp string.In order to control LED lamp cross luma degree, drive the integrated circuit of chip to support three kinds of different burst length modulation (PMW) schemes of 10 bit intervals.

Claims

1. new product comprises TSL2572 series digit type ambient light sensor (ALS), TSL2672 series proximity transducer and simultaneously comprise the TSL2772 series of products of light sensor and proximity transducer, in order to meet the demand of mobile device, sensor must also can be worked under high light, adapt to this demand, the new product of company design meets or exceeds in brightness under the sufficient solar radiation environment of 60000 luxs and still can normally use.

2. mobile device suppliers constantly make great efforts to provide more compellent product to improve user's experience, therefore they need the solution of light detection and proximity detection, enable under lighting condition, working widely, Taos adopts programmable signal gain pattern, comprise a reduced gain, thereby improve the dynamic range of optical sensor, simultaneously, improve signal to noise ratio (S/N ratio), and adopt interference compensation technology, approach and survey thereby provide more accurately, this detector of two types can both still can sporadicly use in the time keeping sleep state, thereby energy consumption is dropped to minimum, it is particularly important that this function seems in battery powered equipment.