Method for illuminating liquid crystal display device, a back-light assembly for performing the same, and a liquid crystal display device using the same

A back-light assembly of a liquid crystal display device, comprising:

• a light source for generating lights;
• a light guide plate formed to one side of said light source for allowing said lights generated from said light source to be uniformly incident to an LCD panel side;
• a first diffuser provided to the LCD panel side of said light guide plate for primarily diffusing the incident lights to uniformly distribute a luminous flux;
• a first condenser provided to the LCD panel side of said first diffuser for primarily condensing the luminous flux of the primarily diffused lights with respect to a first orientation component on a plane substantially-parallel with the LCD panel;
• a second diffuser provided to the LCD panel side of said first condenser for partially and secondarily diffusing the luminous flux of the lights condensed to have the first orientation for enlarging a view angle of pixels of the LCD panel;
• and
• a second condenser provided to the LCD panel side of said second diffuser for secondarily condensing the luminous flux of the secondarily diffused lights with respect to a second orientation that is perpendicular to the first orientation on the parallel plane.

A back-light assembly of a liquid crystal display device, comprising:

• a light source for generating lights;
• a light guide plate formed to one side of said light source for allowing said lights generated from said light source to be uniformly incident to an LCD panel side;
• a first diffuser provided to the LCD panel side of said light guide plate for regulating an incidence angle of lights incident from said light guide plate to a direction having a higher front luminance with respect to a plane of the LCD panel with a repeated diffusion reflection processes and for primarily diffusing the lights to uniformly distribute a luminous flux of the incident lights;
• a first condenser provided to the LCD panel side of said first diffuser for primarily condensing the luminous flux of the primarily diffused lights with respect to a first orientation component on a plane in parallel with the LCD panel;
• a second diffuser for partially and secondarily diffusing the luminous flux of the lights condensed to have the first orientation for enlarging a view angle of pixels of the LCD panel;
• and
• a second condenser for secondarily condensing the luminous flux of the lights condensed to have the first orientation with respect to a second orientation perpendicular to the first orientation on the parallel plane.

A liquid crystal display device, comprising:

• an LCD panel;
• and
• a back-light assembly comprising:
• a light source for generating lights;
• a light guide plate for allowing the lights generated from the light source to be incident to the LCD panel side;
• a diffuser provided to the LCD panel side of the light guide plate for primarily diffusing said incident lights to uniformly distribute a luminous flux of said incident lights;
• a condenser provided to the LCD panel side of the diffuser for primarily condensing the luminous flux of the primarily diffused lights with respect to a first orientation component on a plane in parallel with the LCD panel;
• and
• a high luminance condensing sheet provided to the LCD panel side of the condenser for diffusing and secondarily condensing the luminous flux of said primarily condensed lights.