Liquid crystal display and television receiver

Abstract

A liquid crystal display of the present invention contains a first panel and a second panel being stacked. Adjacent pairs of polarizers (A to C) disposed on the panels form crossed Nicols. When the first panel produces a display according to a first display signal, the second panel produces a display according to a second display signal obtained from the first display signal. Each of the two joined panels is provided with a light diffusion layer having a light diffusing property. The provision of the light diffusion layers enables reducing moire pattern occurrences which would otherwise markedly increase when two liquid crystal panels are stacked. As a result, the liquid crystal display has high display quality.

1 . A liquid crystal display, comprising two or more liquid crystal panels being stacked, wherein at least one of substrates constituting the stacked liquid crystal panels, the particular substrate facing an adjacent panel, is thinner than the substrates which do not face the adjacent panel. 
     
     
         2 . A liquid crystal display, comprising two or more liquid crystal panels being stacked, wherein adjacent liquid crystal panels have dots constituted by like elements, the elements in one of the adjacent panels being formed symmetrical to the elements in the other panel. 
     
     
         3 . A liquid crystal display, comprising two liquid crystal panels being stacked, wherein only either one of the liquid crystal panels includes a color filter. 
     
     
         4 . The liquid crystal display of  claim 3 , wherein the liquid crystal panel containing no color filter includes an active matrix substrate, and an opposite substrate facing the active matrix substrate has at least a black matrix formed thereon. 
     
     
         5 . The liquid crystal display of  claim 4 , wherein the opposite substrate has a light-transmitting resin layer in openings of the black matrix. 
     
     
         6 . The liquid crystal display of  claim 5 , wherein the light-transmitting resin layer covers the black matrix and the openings of the black matrix. 
     
     
         7 . The liquid crystal display of  claim 3 , wherein the liquid crystal panel containing no color filter contains dots each having dimensions n×m times those of each dot in the liquid crystal panel containing the color filter, where n, m are real numbers, at least either one of n and m is greater than 1, n is a ratio taken parallel to gate bus lines, and m is a ratio taken parallel to source bus lines. 
     
     
         8 . The liquid crystal display of  claim 3 , wherein the liquid crystal panel containing the color filter includes a matrix of pixels each constituted by a plurality of color dots, and the liquid crystal panel containing no color filter includes a matrix of dots each having dimensions a whole number times those of each pixel in the liquid crystal panel containing the color filter. 
     
     
         9 . The liquid crystal display of  claim 3 , comprising display control means for outputting gray level data as display signals to the liquid crystal panels so as to control display by the liquid crystal panels,
 wherein the display control means controls gray level data for each dot in the liquid crystal panel containing no color filter to be equal to maximum gray level data for corresponding n×m dots in the liquid crystal panel containing the color filter, where n, m are real numbers, at least either one of n and m is greater than 1, n is a ratio taken parallel to gate bus lines, and m is a ratio taken parallel to source bus lines and also to be equal to gray level data indicated by results of computing reflecting the maximum gray level.   
     
     
         10 . The liquid crystal display of  claim 3 , comprising display control means for outputting gray level data as display signals to the liquid crystal panels so as to control display by the liquid crystal panels,
 wherein the display control means outputs identical gray level data to a group of dots, in the liquid crystal panel containing no color filter, corresponding to each pixel in the liquid crystal panel containing the color filter.   
     
     
         11 . The liquid crystal display of  claim 10 , wherein the identical gray level data is gray level data based on a maximum gray level for one pixel in input data. 
     
     
         12 . A liquid crystal display, comprising:
 a first and a second liquid crystal panel being stacked, each of the panels containing a polarized light absorbing layer, the second liquid crystal panel producing a display according to a second display signal whilst the first liquid crystal panel produces a display according to a first display signal; and   display control means for blurring so that the second liquid crystal panel displays a blurred image when compared to an image displayed on the first liquid crystal panel.   
     
     
         13 . The liquid crystal display of  claim 3 , wherein further comprising display control means for outputting display signals to the liquid crystal panels so as to control the displays produced by the liquid crystal panels, the display control means carrying out smoothing so as to smooth out edges of an image on the liquid crystal panel containing no color filter. 
     
     
         14 . The liquid crystal display of  claim 13 , wherein in the smoothing, the display control means obtains a maximum gray level in N×N pixel regions (M and N are natural numbers), assigns the maximum gray level to a central one of the M×N pixels, and carries out the smoothing using maximum gray level. 
     
     
         15 . The liquid crystal display of  claim 14 , wherein N, M satisfy an equality
   0≦N≦Nmax0≦M≦Mmax
   for maximum values Nmax, Mmax, change with a difference E NM  between a maximum gray level and a minimum gray level of Nmax×Mmax, and are small when E NM  is small and large when E NM  is large.   
     
     
         16 . The liquid crystal display of  claim 14 , wherein N, M are set in order to make a ratio of an actual distance D N  in direction N (D N =Size of Pixel in Direction N×N) and an actual distance D M  in direction M (D M =Size of pixel in Direction M×M) as close to 1 as possible, and an average value Dave of D N  and D M  satisfies D ave ≦D gap ×tan(sin− 1 (1/n)×sin(90°)), where D gap  is a distance between a liquid crystal layer in the color liquid crystal panel and a liquid crystal layer in the black and white liquid crystal panel, and n is an average refractive index of a material present between the two liquid crystal layers. 
     
     
         17 . The liquid crystal display of  claim 16 , wherein n=1.3. 
     
     
         18 . The liquid crystal display of  claim 16 , wherein D ave ≦2.2 mm 
     
     
         19 . A liquid crystal display, comprising:
 a first and a second liquid crystal panel being stacked, each of the panels containing a polarized light absorbing layer, the first liquid crystal panel producing a display according to a first display signal, the second liquid crystal panel producing a display according to a second display signal; and   display means for outputting display signals to the liquid crystal panels so as to control the displays produced by the liquid crystal panels,   wherein the display control means supplies display data with different spatial frequencies to the first and second liquid crystal panels.   
     
     
         20 . The liquid crystal display of  claim 19 , wherein the display control means contains a lowpass filter for filtering the display data for low frequency components and supplies the low frequency components to a liquid crystal panel which produces a display according to the second display signal. 
     
     
         21 . The liquid crystal display of  claim 19 , wherein the display control means contains a bandwidth dividing filter for separating the display data into high frequency components and low frequency components and supplies the high frequency components to the first liquid crystal panel and the low frequency components to a liquid crystal panel which produces a display according to the second display signal. 
     
     
         22 . A liquid crystal display, comprising two liquid crystal panels being stacked, each of the panels containing a polarized light absorbing layer, one of the liquid crystal panels producing a display according to a first display signal whilst the other liquid crystal panel produces a display according to a second display signal, wherein at least one of the liquid crystal panels contains an island-shaped black matrix. 
     
     
         23 . A television receiver, comprising:
 a tuner section for receiving television broadcast; and   a display for displaying the television broadcast received by the tuner section,   the display being a liquid crystal display containing two or more liquid crystal panels being stacked, at least one of the panels including a light diffusion layer having a light diffusing property.