Division unit, image analysis unit and display apparatus using the same

Abstract

A division unit, an image analysis unit and a display apparatus using the same capable of simplifying the computation of overall average gray scale are provided. The shift-add type of division unit includes a plurality of shift units for shifting an input signal by a different number of bits, an adder for totaling the shifted result in the shift units and producing an addition result, and a most-significant-bit (MSB) shift unit for extracting the MSB (contains a plurality of bits) of the addition result to serve as a division result.

What is claimed is: 
     
         1 . A division unit, comprising:
 a first to an N th  shift units for shifting M bits of an input signal by a different number of bits respectively for generating output signals respectively, wherein N and M are positive whole numbers;   an adder for receiving the output signals from the first to the N th  shift units and producing an addition result; and   a most significant bit (MSB) shift unit for receiving the addition result of the adder and extracting an MSB of the addition result to serve as a division result of the division unit.   
     
     
         2 . The division unit of  claim 1 , wherein, when the input signal has 29 bits (M=29) and the division unit divides the input signal by 1152000, then N=5, and the first to the fifth shift units perform a 1-bit, a 2-bits, a 3-bits, a 5-bits and an 8-bits shifting operation of the input signal respectively. 
     
     
         3 . The division unit of  claim 2 , wherein the addition result of the adder has 28 bits. 
     
     
         4 . The division unit of  claim 3 , wherein the MSB shift unit extracts the 8-bit MSB from the 28-bit addition result to serve as the division result. 
     
     
         5 . A division unit for dividing an input signal with M bits (where M is a positive whole number), comprising:
 an adder for receiving a first to an N th  bus signals to produce an addition result, wherein the first to the N th  bus signals shift the input signal by a different number of bits and adding logic zeros to the shifted bits as compensation, where N is a positive whole number; and   a multiplexer for receiving a most significant bit (MSB) of the addition result, wherein, when the MSB has a first value, the multiplexer treats P bits of the addition result as a division result, and when the MSB has a second value, the multiplexer outputs P logic 1 to serve as the division result, where P is a positive whole number.   
     
     
         6 . The division unit of  claim 5 , wherein, when the input signal has 29 bits (M=29) and the division unit divides the input signal by 1152000, then N=5 and P=8, and the first to the N th  bus signals are the result obtained after performing a 1-bit, a 2-bits, a 3-bits, a 5-bits and an 8-bits shifting operation of the input signal respectively. 
     
     
         7 . The division unit of  claim 6 , wherein the addition result of the adder has 29 bits. 
     
     
         8 . The division unit of  claim 7 , wherein the MSB of the addition result is the 29 th  bit, the first value of the MSB is logic ‘0’ and the second value of the MSB is logic ‘1’. 
     
     
         9 . The division unit of  claim 8 , wherein, when the MSB is logic ‘0’, the division result is the 28 th  bit to the 21 st  bit of the addition result. 
     
     
         10 . An image analysis unit for a display apparatus, comprising:
 an adder for receiving all gray scale signals of an image and producing a totaled gray scale signal; and   a shift adder for receiving the totaled gray scale signal of the adder, simultaneously and paralleled shifting the totaled gray scale signal by a different number of bits, adding the shifted totaled gray scale signals together and extracting predetermined bits of the addition result to serve as an overall average gray scale signal of the image, wherein the overall average gray scale signal is used for image analysis.   
     
     
         11 . The image analysis unit of  claim 10 , wherein the shift adder comprises:
 a first to an N th  shift units for shifting the M-bit totaled gray scale signal a different number of bits respectively for generating output signals respectively, wherein N and M are positive whole numbers;   an adder for receiving the output signals of the first to the N th  shift units to produce an addition result; and   a most significant bit (MSB) shift unit for receiving the addition result of the adder and extracting an MSB of the addition result to serve as the overall average gray scale signal.   
     
     
         12 . The image analysis unit of  claim 10 , wherein the shift adder comprises:
 an adder for receiving a first to an N th  bus signals and producing an addition result, wherein the first to the N th  bus signals shift the M-bits totaled gray scale signal by a different number of bits and add logic ‘0’ to the shifted bits as compensation, where N is a positive whole number; and   a multiplexer for receiving a most significant bit (MSB) of the addition result of the adder, wherein, when the MSB is logic ‘O’, the multiplexer treats P bits of the addition result as the overall average gray scale signal, and when the MSB is logic ‘1’, the multiplexer outputs a plurality of logic ‘1’ to serve as the overall average gray scale signal, where P is a positive whole number.   
     
     
         13 . A display apparatus, comprising:
 an image analysis unit for receiving all gray scale signals of an image to produce a totaled gray scale signal, simultaneously performing a shifting of the totaled gray scale signal by a different number of bits, adding up the shifted totaled gray scale signals and extracting predetermined bits of the addition result to serve as an overall average gray scale signal of the image;   an image-quality adjusting unit for receiving the overall average gray scale signal produced by the image analysis unit; and   a panel for displaying the image, wherein the image-quality adjust unit adjusts the image displayed on the panel according to the overall average gray scale signal.   
     
     
         14 . The display apparatus of  claim 13 , wherein the image analysis unit comprises:
 an adder for receiving all gray scale signals of the image to produce a totaled gray scale signal; and   a shift adder for simultaneously shifting the totaled gray scale signal by a different number of bits, adding up the shifted totaled gray scale signals and extracting predetermined bits of the addition result to serve as an overall average gray scale signal of the image.   
     
     
         15 . The display apparatus of  claim 14 , wherein the shift adder comprises:
 a first to an N th  shift units for shifting the M-bits totaled gray scale signal by a different number of bits for generating output signals respectively, where N and M are positive whole numbers;   an adder for receiving the output signals from the first to the N th  shift units and producing an addition result; and   a most significant bit (MSB) shift unit for receiving the addition result of the adder and extracting an MSB of the addition result to serve as the overall average gray scale signal.   
     
     
         16 . The display apparatus of  claim 14 , wherein the shift adder comprises:
 an adder for receiving a first to an N th  bus signals to produce an addition result, wherein the first to the N th  bus signals shift the M-bits totaled gray scale signal by a different number of bits and adding logic ‘0’ to the shifted bits as compensation, where N is a positive whole number; and   a multiplexer for receiving a most significant bit (MSB) of the addition result of the adder, wherein, when the MSB is logic ‘0’, the multiplexer treats P bits of the addition result as the overall average gray scale signal, and when the MSB is logic ‘1’, the multiplexer outputs a plurality of logic ‘1’ to serve as the overall average gray scale signal, where P is a positive whole number.   
     
     
         17 . The display apparatus of  claim 13 , wherein the image-quality adjusting unit comprises a contrast-adjust unit, or a dynamic backlight adjusting unit, or a combination of the two.