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. 3685 Richmond Road, Suite 500, Ottawa, ON K2H 5B7 Canada Tel: 613.829.0515 www.chipworks.com
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
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
Himax HX8347-A LCD Driver Page 1 List of Figures 0.1.1 Die Markings 0.2.0 Die Photograph 0.2.1 Die Photograph Polysilicon 0.2.2 Die Architecture 1 0.2.3 Die Architecture 2
Himax HX8347-A LCD Driver Page 2 List of Schematics 1.0.0 Top Level Diagram 2.0.0 Source Driver 2.1.0 D/A Converter 2.1.1 DAC Decoder 2.1.2 Current Cell 1 2.1.3 Current Cell 2 2.2.0 Source Driver 2.3.0 Driver ESD 3.0.0 Gate Drivers 3.1.0 Gate Driver Control 3.2.0 Gate Driver 1 3.2.1 Decoder 3.2.2 Level Shifter 3.2.3 G Driver 3.3.0 Gate Driver 2 4.0.0 Step Up Circuits 4.1.0 Step Up 1 4.1.1 Logic 1 4.1.2 Charge Pump 1 4.1.2.1 Programmable Resistors 4.1.2.1.1 Addressed Transmission Gate 4.2.0 Step Up 2 4.2.1 Logic 2 4.2.2 Charge Pump 2 4.3.0 Step Up 3 4.3.1 Logic 3 4.3.2 Charge Pump 3
Himax HX8347-A LCD Driver Page 3 4.4.0 Step Up Logic 4.4.1 Step Up Logic 1 4.4.1.1 Buffer 4.4.2 Step Up Logic 2 4.4.3 Step Up Logic 3 4.4.4 Step Up Logic 4 4.4.4.1 Step Up Logic 5 4.4.4.2 Step Up Logic 6 4.4.4.2.1 Step Up Delay I 4.4.4.3 Step Up Logic 7 4.4.4.3.1 Step Up Delay II 4.4.4.3.1.1 Step Up Delay III 4.5.0 ESD & Diodes 4.6.0 Signal Buffers 4.7.0 Unused Step-Up Buffers 5.0.0 Greyscale Voltages 5.1.0 Digital Control 1 5.10.0 Unused Circuits 5.2.0 Selection 1 5.3.0 V Greyscale Generator 5.3.1 Reference Generator 1 5.3.2 Reference Generator 2 5.3.3 Resistor String 1 5.3.4 Resistor String 2 5.3.5 Resistor String 3 5.3.6 Resistor String 4 5.3.7 Resistor String 5 5.4.0 Reference Generator I 5.5.0 Reference Generator II 5.6.0 V Gamma Adj. 5.6.1 Buffers
Himax HX8347-A LCD Driver Page 4 5.6.2 R Ladder 1 5.6.2.1 Selection Decoder II 5.6.3 R Ladder A 5.6.3.1 R Ladder A1 5.6.3.1.1 Voltage Selection 5.6.3.2 R Ladder A2 5.6.3.2.1 PR Decoder 5.6.3.2.2 Programmable Resistor 5.6.3.3 R Ladder A3 5.6.3.4 R Ladder A4 5.6.3.5 R Ladder A5 5.6.3.6 R Ladder A6 5.6.3.7 R Ladder A7 5.6.3.7.1 Decoder 5.6.3.7.2 R Ladder 5.6.3.8 R Ladder A8 5.6.3.8.1 R Ladder 5.6.3.8.2 Selection 5.6.4 R Ladder 2 5.6.4.1 Selection Decoder 5.6.5 R Ladder B 5.7.0 Bias Circuits 5.7.1 Bandgap Bias 5.7.1.1 Resistor 1 5.7.2 Bias Generator 5.7.2.1 Inverting Circuit 5.7.2.2 Dummy Branch 5.7.3 Internal Voltage Generator I 5.7.4 Bias Generator I 5.8.0 Test Selection 5.9.0 Latching MUX Array 5.9.1 Latching MUX
Himax HX8347-A LCD Driver Page 5 6.0.0 Internal Voltage Generators 6.1.0 Bandgap Reference Generators 6.1.1 Bandgap Voltage Generator I 6.1.2 Programmable Resistor II 6.1.3 Bandgap Control 6.1.4 Bandgap Voltage Generator I 6.2.0 Internal Voltage Generator I 6.2.1 Programmable Resistor III 6.3.0 Internal Voltage Regulator II 6.3.1 Programmable Resistor IV 6.4.0 Regulator Bias Generator 6.5.0 Voltage Generator Control 6.6.0 Signal Buffers 6.7.0 Unknown I 6.7.1 Programmable Capacitor I 6.7.2 Programmable Capacitor II 6.8.0 Unknown II 6.8.1 Programmable Resistor V 6.8.2 Programmable Current Bias 6.8.3 Programmable Capacitor I 7.0.0 VCOM Generator 7.1.0 VCOM DAC 7.1.1 VCOM DAC Digital Control 7.1.2 Programmable Resistor VI 7.1.3 Programmable Resistor Segment I 7.1.4 Programmable Resistor Segment II 7.1.5 Programmable Resistor Segment III 7.1.6 Programmable Resistor Segment IV 7.1.7 Programmable Resistor Segment V 7.2.0 VCOM Driver
Himax HX8347-A LCD Driver Page 6 7.3.0 Non-Overlapping Clock Generator 7.4.0 VCOM Digital Control 8.0.0 External Voltage Monitors 8.1.0 VDDD Voltage Monitor 8.2.0 VCI Voltage Monitor 9.0.0 Control Decoder 10.0.0 OTP Memory 11.0.0 Signal Buffers 11.1.0 Unknown I 11.2.0 Unknown II 11.2.1 Buffers 11.2.2 Buffer 11.3.0 Level Shifter I 11.4.0 Buffers 11.4.1 Buffer
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