Abstract: A resistor unit is adapted for use in a constant current source circuit or a temperature compensating circuit for providing temperature compensation to a constant voltage reference circuit. The resistor unit includes at least one first resistor, and at least one second resistor coupled to the first resistor. One of the first and second resistors is a positive temperature coefficient resistor. The other one of the first and second resistors is a negative temperature coefficient resistor. Because a temperature characteristic of the first resistor is opposite to that of the second resistor, an effective resistance of the resistor unit changes in a relatively narrower range with temperature.

Abstract: A processing circuit for automatic detection and compensation of pixel defects includes a reading unit, a data buffer module, and a calculating module. The reading unit reads pixel values of a predetermined number of pixels in sequence. The pixel values include a target pixel value and a pixel value group adjacent to the target pixel value. The data buffer module receives the pixel values outputted from the reading unit, and stores the same temporarily in a FIFO manner. The calculating module calculates and processes the target pixel value and the pixel value group from the data buffer module to generate a processing value. If the processing value is equal to the target pixel value, the latter is outputted. If the processing value is not equal to the target pixel value, the former is outputted. Thus, pixel defects can be immediately detected and compensated when outputting the pixel values.