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Row reading circuit

A technology of reading circuit and sampling circuit, applied in the direction of instruments, static indicators, etc., can solve the problem of large circuit area of ​​the line reading circuit

Inactive Publication Date: 2010-06-16
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will lead to the problem that the row reading circuit needs to occupy a large circuit area

Method used

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Examples

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Effect test

no. 1 example

[0017] Please refer to figure 1 , which is a block diagram of an image sensing device applying the row readout circuit according to an embodiment of the present invention. The image sensing device 1 includes a pixel array 12, a column decoder (Row Decoder) 14, a row decoder (ColumnDecoder) 16, a timing controller (Timing Controller) 18, a row readout module 20, a bias circuit 22 and an output processor twenty four.

[0018] The pixel array 12 is, for example, a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) pixel array with a size of M×N, which is used to generate a sensing image with a size of M×N pixels, wherein M and N are both larger than The natural number of 1. The pixel array 12 is controlled by the column decoder 14, the row decoder 16, the timing controller 18 and the bias circuit 22, and the sensing image generated by it can pass through the data lines SL1-SLM, the row readout module 20 and the output processor 24 output. ...

no. 2 example

[0034] Please refer to Figure 4 and Figure 5 , Figure 4 A circuit diagram showing a row output circuit according to a second embodiment of the present invention, Figure 5 painted Figure 4 The relevant signal waveform diagram of the line output circuit. Different from the first embodiment, the levels at both ends of the sampling capacitors C1 ′ to C4 ′ in the sampling circuits 202 ′ and 204 ′ of this embodiment are provided by the control circuit 206 ′, and the control circuit 206 ′ is also used for the corresponding sampling During the period, the reference voltage Vr4 is provided to the sampling capacitors C1 ′˜C4 ′.

[0035] More specifically, the switches SW5', SW7' and SW9' are respectively turned on in response to the control signals S5', S7' and S9' in the sub-scanning period TS1' to form a short-circuit path to provide the reference voltage Vr4 to the sampling capacitor C1' and One end of C3'. In this way, the sampling capacitors C1' and C3' respectively samp...

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Abstract

The invention relates to a row reading circuit for sampling a first and a second picture element signals respectively transmitted through a first and a second data lines in a picture element array. The row reading circuit comprises a first and a second sampling circuits, an amplifier circuit and a control circuit, wherein the control circuit is used for controlling the first sampling circuit to sample the reset level and the data level of the first picture element signal during first sampling and controlling the second sampling circuit to sample the reset level and the data level of the second picture element signal during second sampling. The control circuit controls the amplifier circuit to output the reset level and the data level of the first picture element signal during first sampling and output the resetting level and the data level of the second picture element signal during second sampling.

Description

technical field [0001] The present invention relates to a row read (Correlated Double Sampling) circuit, and in particular to a row read circuit used to sample pixel signals transmitted on multiple data lines. Background technique [0002] In the prior art, a row readout (Correlated Double sampling) circuit can receive a signal output by a pixel, sample it and output it. For example, the signal output by the pixel includes a reset level and a data level, and the row readout circuit has a corresponding sampling circuit to respectively sample the reset level and the data level of the pixel signal. The row reading circuit also includes an amplifier circuit for outputting the level sampled by the sampling circuit. [0003] Traditionally, the number of row readout circuits needs to correspond to the size of the pixel array. For example, for a pixel array with a size of 1600×1200, it needs to use 1600 row readout circuits to respectively sample the pixel signals transmitted on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/32
Inventor 周国煜
Owner NOVATEK MICROELECTRONICS CORP