Liquid crystal display device having color filter

Claim 2

A liquid crystal display device having a color filter comprising: a liquid crystal shutter device having a pair of opposed glass plates, opposed electrode groups on the respective inner surfaces of the glass plates, at least one polarizer, a liquid crystal layer between the opposed electrode groups, and a voltage applying means for selectively applying a voltage across the electrode groups; at least one color filter layer formed on one surface of the liquid crystal shutter device; and at least one diffusion preventing layer for protecting the at least one color filter layer, characterized in that the color filter layer is prepared by a photolithographic process comprising the steps of forming a layer being colored on one surface of the liquid crystal shutter device, forming a photoresist layer thereon, while illuminating the liquid crystal shutter device from the other surface thereof by white light, applying the voltage across the selected opposed electrode groups through the voltage applying means to form a latent image on the photoresist layer by a photochemical action, the latent image being aligned with the electrode groups, developing the latent image to form a photomask, and after a while, while using the photomask as a guide, coloring the layer being colored.

Claim 3

A liquid crystal display device having a color filter of claim 1 wherein the color filter layer has a laminated structure in which a plurality of filter layers colored sequentially in each of three primary colors and a plurality of diffusion preventing layers are laminated alternately by the photolithographic method.

Claim 4

A liquid crystal display device having a color filter of claim 1 wherein the color filter layer has a single layer structure comprising portions colored sequentially in each of the primary colors and colored portions at which the primary colors overlap produced by the photolithographci method.

Claim 5

A liquid crystal display device having a color filter of claim 1 or claim 2, characterized in that the color filter layer is prepared by a photolithographic process comprising the steps of forming a first layer being colored on one surface of the liquid crystal shutter device, forming a first photoresist layer of a negative type thereon, while illuminating the liquid crystal shutter device ,from the other surface thereof by white light, applying the voltage across the first selected opposed electrode groups through the voltage applying means to prevent the light from passing through a portion of the liquid crystal layer to which the voltage is applied and to expose a portion of the photoresist layer sensitive to the light, thereby forming a first pattern latent image, the first pattern latent image being hardened, developing the first latent image to form a first pattern mask, while using the mask as a guide, etching away the portion of the first layer being colored corresponding to the first selected opposed electrode groups, removing the mask, coating and dyeing the unetched portion of the first layer being colored with a first color of three primary colors to form a first colored layer, and forming a first diffusion preventing layer on an upper surface of the first colored layer; forming a second layer being colored and a second photoresist layer of the negative type on an upper surface of the first preventing layer, while illuminating the liquid crystal shutter device from the other surface thereof by white light, applying the voltage across the second selected opposed electrode groups through the voltage applying means to prevent the light from passing through a portion of the liquid crystal layer to which the voltage is applied and to expose a portion of the second photoresist layer sensitive to the light, thereby forming a second pattern latent image, the second pattern latent image being hardened, developing the second latent image to form a second pattern mask, while using the mask as a guide, etching away the portion of the second layer being colored corresponding to the second selected opposed electrode groups, removing the mask, coating and dyeing the unetched portion of the second layer being colored with a second color of the three primary colors to form a second colored layer, and forming a second diffusion preventing layer on an upper surface of the second colored layer; and forming a third layer being colored and a third photoresist layer of the negative type on an upper surface of the second preventing layer, while illuminating the liquid crystal shutter device from the other surface thereof by white light, applying the voltage across the third selected opposed electrode groups through the voltage applying means to prevent the light from passing through a portion of the liquid crystal layer to which the voltage is applied and to expose a portion of the third photoresist layer sensitive to the light, thereby forming a third pattern latent image, the third pattern latent image being hardened, developing the third pattern latent image to form a third pattern mask, while using the mask as a guide, etching away the portion of the third layer being colored corresponding to the third selected opposed electrode groups, removing the mask, coating and dyeing the unetched portion of the third layer being colored with a third color of the three primary colors to form a third colored layer, and forming a third diffusion preventing layer on an upper surface of the third colored layer.

Claim 6

A liquid crystal display device of claim 4 wherein the first colored layer is blue, the second colored layer is green and the third colored layer is red.

Claim 7

A liquid crystal display device having a color filter of claim 1 or claim 3, characterized in that the color filter layer is prepared by a photolithographic process comprising the steps of forming a layer being colored on one surface of the liquid crystal shutter device, forming a first photoresist layer of a positive type thereon, while illuminating the liquid crystal shutter device from the other surface thereof by white light, applying the voltage across the first selected opposed electrode groups through the voltage applying means to prevent the light from passing through a portion of the liquid crystal to which the voltage is applied and to expose a portion of the first photoresist layer sensitive to the light, thereby forming a first latent image which is soluable, developing the latent image to leave the unexposed portion of the first photoresist layer, thereby forming a mask for a first coloring guide, pouring a dye of a first color of three primary colors into the first layer being colored from a hole therein caused by the solution of the mask to form a first colored portion, and removing the mask to reveal the layer being colored having the first colored portion; forming a second photoresist layer of the positive type on an upper surface of the layer being colored, while illuminating the liquid crystal shutter device from the other surface thereof by white light, applying the voltage across the second selected opposed electrode groups through the voltage applying means to prevent the light from passing through a portion of the liquid crystal to which the voltage is applied and to expose a portion of the second photoresist layer sensitive to the light, thereby forming a second latent image which is soluable, developing the latent image to leave the unexposed portion of the second photoresist layer, thereby forming a mask for a second coloring guide, pouring a dye of a second color of the three primary colors into the second layer being colored from a hole therein caused by the solution of the mask to form a second colored portion, and removing the mask to reveal the layer being colored having the first and second colored portions; and forming a third photoresist layer of the positive type of the upper surface of the layer being colored, while illuminating the liquid crystal shutter device from the other surface thereof by white light, applying the voltage across the third selected opposed electrode groups through the voltage applying means to prevent the light from passing through a portion of the liquid crystal to which the voltage is applied and to expose a portion of the third photoresist layer sensitive to the light, thereby forming a third latent image which is soluable, developing the latent image to leave the unexposed portion of the third photoresist layer, thereby forming a mask for a third coloring guide, pouring a dye of a third color of the three primary colors into the third layer being colored from a hole therein caused by the solution of the mask to form a third colored portion, removing the mask to reveal the layer having the first, second and third colored portions, part of the first, second and third portions being overlapping, and forming a diffusion preventing layer on the upper surface of the layer having the first, second and third colored portions.