TFT array overview

1
TFT array overview

• TFT array is one layer with color filter envelops
  the liquid crystal.
• The TFT array plays the role as write-only analog
  memory which stores the pixel information.
• Source (data) driver controls columns.
• Gate (scan) driver controls rows

2
Analog buffer

• Unit gain OPAMP type
• Slower response
• Offset issue
• Finite gain issue
• Source follower type
• Faster response
• Sub-threshold effect issue

3
Overall system (without control system)

• CS buffer charge sensing capable buffer
• Between the output of DAC and data line

4
The proposed buffer

• Five more switches than offset compensated
  buffer.
• Still one capacitor