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Holtek HT45FH3T Using Manual

Active 3d glasses
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Using the HT45FH3T for Active 3D Glasses
D/N: AN0315E
Introduction
With the continuous development of people's living standards, the requirements for
audio-visual entertainment is increasing, thus more and more 3D videos, movies and
games are being produced and along with this is the rising demand for 3D glasses. A new
3D technology, a combination of active shutter 3D technology and active shutter 3D glasses,
is widely used in TV and projector applications and provides good imaging effects.
The Holtek HT45FH3T is especially designed for active 3D glasses development and this
application sets out to show how it is used in such applications.
3D Glasses Functions
The main function of 3D glasses is to receive and decode the IR signals from the TV for
3D glasses control. Due to the high voltage driving requirement, a boost circuit is needed
to increase the battery voltage to 10V~12V for 3D glasses driving. A pair of 3D glasses
contains two lenses each for the left eye and right eye. As each lens needs two high
driving voltages, thus four high driving voltages are needed. So each 3D glasses circuit
contains four level shift circuits, which are used to increase the 3V MCU I/O output
voltage to 10V~12V for the 3D glasses on/off control. In addition, each pair of 3D glasses
needs an IR receiver circuit to receive external IR signals.
3D glasses normally use a battery power supply, which can be divided into two types. The
first type is a chargeable lithium battery and the second type is a non-chargeable button
battery. An additional lithium battery charging circuit is required when using the lithium
battery.
Using the HT45FH3T in the Active 3D Glasses
1

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Summary of Contents for Holtek HT45FH3T

  • Page 1 3D technology, a combination of active shutter 3D technology and active shutter 3D glasses, is widely used in TV and projector applications and provides good imaging effects. The Holtek HT45FH3T is especially designed for active 3D glasses development and this application sets out to show how it is used in such applications.
  • Page 2 16-bit PTM×1 -- decodes IR input signals • Over Voltage Protection function • Level shift×4 • 3V LDO×1 • Note: 1. The HT45FH3T system clock can be up to 4MHz. 2. The HT45FH3T-1 system clock can be up to 8MHz.

  • Page 3: Hardware Block Diagram

    Using the HT45FH3T in the Active 3D Glasses HT45FH3T 3D Glasses Main Features Uses lithium battery : 100mAh • Charging • − Charging stand : USB Mini-B type ; input voltage : 5V − Use 100mA constant current for charging Use 3-Line controlled LCD lenses •...
  • Page 4 Using the HT45FH3T in the Active 3D Glasses Hardware Block Diagram Functional Description Main control IC : HT45FH3T-1 -- system clock : 8MHz • Main USB charging port • This port can be connected to a computer USB interface or an external power adapter for lithium battery charging.
  • Page 5 Using the HT45FH3T in the Active 3D Glasses IR Receiver Circuit The schematic is shown below: 15pF 200k 4.7nF 15pF 7.15k 330pF Amplify and filter the TO MCU tiny current generated by the IR Photodiode Two signals input to the...

  • Page 6: Circuit Description

    Using the HT45FH3T in the Active 3D Glasses Circuit Description Battery Control Circuit The MCU can use PA1 to control the battery. When powered off, the user can press the button to turn on the power. When powered on, the MCU must keep PA1 high to ensure Q3 remains on.
  • Page 7 VDD low voltage condition. LED used as a Low Voltage Indicator Main control MCU The main control MCU is the HT45FH3T-1, which has both integrated PWM and OVP circuits. IR Receiver Circuit In this circuit, tiny signals received by the IR photodiode will be filtered, amplified and...
  • Page 8 Using the HT45FH3T in the Active 3D Glasses IR Signals and LCD Lens Control Description Different 3D videos may generate different control signals, some IR signals have carrier signals while some signals are carrier-free. This application uses an nVIDIA protocol working together with IR signals with no carrier to implement decode operation and control the LCD lenses.

  • Page 9: Pcb Layout

    Using the HT45FH3T in the Active 3D Glasses PCB Layout Main Board Front Back...
  • Page 10 Using the HT45FH3T in the Active 3D Glasses Receiver Board...
  • Page 11 Using the HT45FH3T in the Active 3D Glasses HT45FH3T 3D Glasses Demo Board – BOM Table Main Board Package Type Symbol Value Number Note HT45FH3T-1 SSOP16 Charging IC IN4054 SOT23-5 HT7830 SOT89 Capacitor C9,C8 0.1uF 0603 10uF 0805 C1,C2,C3,C4,C5 0603...

  • Page 12: Software Flow Chart

    Using the HT45FH3T in the Active 3D Glasses Software Flowchart Main Architecture Flowchart...
  • Page 13 Using the HT45FH3T in the Active 3D Glasses LCD Lenses Flowchart...
  • Page 14 Using the HT45FH3T in the Active 3D Glasses Demo Board Pictures Conclusions As the demand for 3D glasses products is increasing, the HT45FH3T can be used to reduce additional circuit requirements and PCB area, thus reducing production costs.

This manual is also suitable for:

An0315e