Sanyo EP92H manual Amorphous Optical Sensors, Amorphous Optical Sensor Structure, AM-30-26

Page 17
: 10 to 10k Lx

Achieving Low Power and Superb Viewability

Amorphous Optical Sensors

Amorphous Silicon Solar Cells

Amorphous Optical Sensors

These devices are a type of photodiode that can detect light with about the same sensitivity as the human eye. Since these devices flexibly support a wide range of end product designs and sizes, they can be used to control the LCD backlight and button lamps in cell phones to implement power saving automatic brightness adjustment

Amorphous Optical Sensor Structure

These devices are a type of photodiode that can detect the presence/absence of ambient light, or the intensity of ambient light.

Like amorphous silicon solar cells, amorphous optical sensor use the photovoltaic effect in semiconductors.

Light

Amorphous optical sensor spectral sensitivity

Visible wavelength amorphous optical sensor

Human visual sensitivity

Single-crystal silicon optical sensors

 

Illumination-dependent characteristics of ISC

 

 

Amorphous optical sensor pattern examples

Measured at FL (for color illuminator): 1 to 10 kLx at SS (Solar Simulator)

When light hits a semiconductor, electrons and holes are created, the electrons diffuse in the n-type semiconductor, and the holes diffuse in the p-type semiconductor. As a result, a current will flow when the

(+) Anode

Transparent electrode

+

sensitivity

1

 

Relative

0.5

400

500

600

700

800

900

1000

Isc(A)

1.E-03

1.E-04

1.E-05

1.E-06

1.E-07

1.E-08

1.E-09

1.E-10

1

[AM-30-26]

10

100

1,000

10,000

100,000

2.1 1.2

2.0

0.88

0.84

[AM-30-26]

two semiconductor types are connected externally.

p

+

+ +

+

 

 

+

 

 

 

+

 

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

+

 

 

 

 

+

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

i

+

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

+

 

 

 

+

 

 

 

 

 

 

 

 

 

 

(-) Cathode

n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Metallic electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electron

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Wavelength [nm]

High sensitivity in the visible region

The human eye is sensitive to light with wavelengths from about 400 nm to about 700 nm. Since these amorphous optical sensors have sensitivity to essentially the same wavelengths, they provide sensing that is close to that of the

Illumination [Lux]

The output current is proportional

to the illumination

Since the output current changes proportionally to the light striking the sensor, these devices provide precise detection.

Flexible pattern geometries and sizes

These devices support designs with sizes and shapes that correspond to the target application.

+ Electron hole

Amorphous Optical Sensor Circuit Examples

human eye.

With an operational amplifier

Without an operational amplifier

Amorphous Optical Sensor Application Examples

Automatic adjustment of LCD backlight and operating panel buttons

A/D

A/D converter

These sensors can be used to sense the ambient illumination level and automatically turn off these lamps in bright operating environments. This reduces unnecessary power consumption and creates LCD screen display that is easy to see whatever the ambient lighting.

Cell phone with built-in optical sensor

Bright environments

 

Dark environments

LCD backlight OFF

LCD backlight ON

LCD backlight ON

Amorphous Optical Sensor (AM-30-26)

converter

C

Amorphous

Optical Sensor

(AM-30-26)

R

Increased operating time for portable electronic equipment due to reduced power consumption!

LCD backlight level automatically adjusted to just the right level for viewing according to the ambient illumination level

Bright environments

Dark environments

 

LCD backlight

OFF

Automatic brightness adjustment ON

 

Button lamps

 

About 300Lx

About 3Lx

 

Button lamps OFF

Button lamps OFF

Button lamps ON

 

5 to 20mA

55 to 70mA

95 to 110mA

 

 

 

 

 

Cell phone without built-in optical sensor

 

 

 

Bright environments

Dark environments

LCD backlight ON

LCD backlight ON

LCD backlight ON

 

Unnecessary power

Unnecessary power

 

 

consumption occurs

consumption occurs

 

Button lamps ON

Button lamps ON

Button lamps ON

 

95 to 110mA

95 to 110mA

95 to 110mA

The current output from the amorphous optical sensor is

The amorphous optical sensor is connected to a resistor and the

converted to a voltage, and signal processing is applied to that

voltage is input directly to an A/D converter for discrimination.

voltage.

 

Normally, an operational amplifier is used for linear amplification.

 

Amorphous Optical Sensor Product Lineup

Type No.

External dimensions (mm)

Short-circuit current (ISC, typical)

Dark current (VR = 50 mV) MAX.

AM-30-26

2.1 2.0 mm2

1.2 A *1

10 pA

(glass thickness: 0.4 mm)

 

 

 

 

 

 

 

 

*1 : at 1000Lux, Fluorescent Light for color illuminator

Contact your SANYO sales representative for details on these products

 

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Image 17
Contents Cell Phone Devices N T E N T S Sanyo Group Cellll Phone Components ISB-Solo IntegratedISystem inin BoardISB-Duo ISB-QuadEarlier mounted LC822964SR Series Cell Phone Block Diagram Examples Frame Transfer CCD Frame Transfer Full-Color CCD SensorsMultifunction DSP chip High sensitivityLC99359+LC99812 Type 3.2 MP CCD Camera Module for Cell PhonesLC99359 LC99812Easy Radio Ictm LV24000 Series System-on-chip FM Radio ICs for Miniature Cell PhonesApplication Example LV24002 LV24000Changing Total Costs System-on-chip FM Radio ICs Easy Radio Ictm SeriesFunction and lineup Audio Compression IC Sound Generator IC MidiCell Phone Video Drivers Terrestrial Digital One-Segment ChipsetNTSC/PAL Video Encoder What is an earphone mic? Earphone Mic SolutionsLED Driver ICs New Charge Pump ICs CCD Power Supply IC for Camera Cell PhonesLV5711FN White LEDMotor Drivers for Cell Phones Amorphous Optical Sensors Amorphous Optical SensorsAmorphous Optical Sensor Structure Amorphous Optical Sensor Application ExamplesLow VF/IR Schottky barrier diodes for power management Ultralow on-resistance MOS devices for power managementSANYOs Lineup of High-Reliability Discrete Devices LCD backlight ultralow saturation voltage transistorsDigital Cell Phone 0.8 GHz, 1.5 GHz FETs for Cell phone ECMUltralow on-resintance Power MOSFETs for RF and logic block Power MOSFETs+ Schottky Barrier Diodes for logic blockMicrowave Device Series Low saturation voltage transistors for logic blockOrdering Number EP92H