Himax. HX8347-A LCD Driver. Circuit Analysis

Transcription

1 Himax HX8347-A LCD Driver Circuit Analysis For questions, comments, or more information about this report, or for any additional technical needs concerning semiconductor technology, please call Sales at Chipworks Richmond Road, Suite 500, Ottawa, ON K2H 5B7 Canada Tel:

2 Himax HX8347-A LCD Driver Table of Contents Overview Top Level Diagram Source Driver Gate Drivers Step Up Circuits Greyscale Voltages Internal Voltage Generators VCOM Generator External Voltage Monitors Control Decoder OTP Memory Area 2 Signal Buffers Cell Library Signal Cross-Reference List Report Evaluation

3 Himax HX8347-A LCD Driver Overview List of Figures... Page 1 List of Schematics... Page 2 Introduction... Page 7 Brief Design Overview... Page 7 Component Descriptions... Page 10 Device Summary Sheet... Page 12

4 Himax HX8347-A LCD Driver Page 1 List of Figures Die Markings Die Photograph Die Photograph Polysilicon Die Architecture Die Architecture 2

5 Himax HX8347-A LCD Driver Page 2 List of Schematics Top Level Diagram Source Driver D/A Converter DAC Decoder Current Cell Current Cell Source Driver Driver ESD Gate Drivers Gate Driver Control Gate Driver Decoder Level Shifter G Driver Gate Driver Step Up Circuits Step Up Logic Charge Pump Programmable Resistors Addressed Transmission Gate Step Up Logic Charge Pump Step Up Logic Charge Pump 3

6 Himax HX8347-A LCD Driver Page Step Up Logic Step Up Logic Buffer Step Up Logic Step Up Logic Step Up Logic Step Up Logic Step Up Logic Step Up Delay I Step Up Logic Step Up Delay II Step Up Delay III ESD & Diodes Signal Buffers Unused Step-Up Buffers Greyscale Voltages Digital Control Unused Circuits Selection V Greyscale Generator Reference Generator Reference Generator Resistor String Resistor String Resistor String Resistor String Resistor String Reference Generator I Reference Generator II V Gamma Adj Buffers

7 Himax HX8347-A LCD Driver Page R Ladder Selection Decoder II R Ladder A R Ladder A Voltage Selection R Ladder A PR Decoder Programmable Resistor R Ladder A R Ladder A R Ladder A R Ladder A R Ladder A Decoder R Ladder R Ladder A R Ladder Selection R Ladder Selection Decoder R Ladder B Bias Circuits Bandgap Bias Resistor Bias Generator Inverting Circuit Dummy Branch Internal Voltage Generator I Bias Generator I Test Selection Latching MUX Array Latching MUX

8 Himax HX8347-A LCD Driver Page Internal Voltage Generators Bandgap Reference Generators Bandgap Voltage Generator I Programmable Resistor II Bandgap Control Bandgap Voltage Generator I Internal Voltage Generator I Programmable Resistor III Internal Voltage Regulator II Programmable Resistor IV Regulator Bias Generator Voltage Generator Control Signal Buffers Unknown I Programmable Capacitor I Programmable Capacitor II Unknown II Programmable Resistor V Programmable Current Bias Programmable Capacitor I VCOM Generator VCOM DAC VCOM DAC Digital Control Programmable Resistor VI Programmable Resistor Segment I Programmable Resistor Segment II Programmable Resistor Segment III Programmable Resistor Segment IV Programmable Resistor Segment V VCOM Driver

9 Himax HX8347-A LCD Driver Page Non-Overlapping Clock Generator VCOM Digital Control External Voltage Monitors VDDD Voltage Monitor VCI Voltage Monitor Control Decoder OTP Memory Signal Buffers Unknown I Unknown II Buffers Buffer Level Shifter I Buffers Buffer

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