Viewing angle controllable liquid crystal display device
First Claim
1. A viewing angle controllable liquid crystal display device, comprising:
- a first type of liquid crystal molecules oriented to transmit polarized light at an off-angle from a lateral axis of the device to prevent a gray inversion at side viewing angles;
a half wave plate structure for delaying a phase of the polarized light from the first type of liquid molecules so that the polarized light is reoriented to be perpendicular to the lateral axis of the display device; and
a second type of liquid crystal molecules for selectively switching between narrow and wide viewing angles with a bilateral symmetry.
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Abstract
The present invention relates to a viewing angle controllable liquid crystal display device. The purpose of the present invention is to provide a viewing angle controllable liquid crystal display device applied with TN mode LCD panel in which a narrow view angle mode is possible in bilateral symmetry. In order to achieve above mentioned purposes, the present invention comprises of: a first panel including a TN mode liquid crystal material having a lowest liquid crystal layer aligned to −45° direction from a lateral axis of the device and a upper most liquid crystal layer aligned to +45° direction from the lateral axis, and a upper polarizing plate disposing on the TN mode liquid crystal material and having a light transmission axis parallel to +45° direction from the lateral axis; a half wave plate disposing above the first panel and delaying a phase of light passing the first panel so that a polarization axis determined by the first panel is changed to perpendicular to the lateral axis; and a second panel disposing above the half wave plate, including ECB liquid crystal material and controlling a viewing angle in bilateral symmetry.
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Citations
20 Claims
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1. A viewing angle controllable liquid crystal display device, comprising:
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a first type of liquid crystal molecules oriented to transmit polarized light at an off-angle from a lateral axis of the device to prevent a gray inversion at side viewing angles; a half wave plate structure for delaying a phase of the polarized light from the first type of liquid molecules so that the polarized light is reoriented to be perpendicular to the lateral axis of the display device; and a second type of liquid crystal molecules for selectively switching between narrow and wide viewing angles with a bilateral symmetry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A viewing angle controllable liquid crystal display device, comprising:
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twisted nematic liquid crystal molecules positioned between an upper polarizer and a pixel electrode of a first panel for delaying a phase of light to change polarization direction of the light by 90°
;a half wave plate structure for delaying a phase of the light from the twisted nematic liquid crystal molecules to further change polarization direction by 45°
; andelectrically controlled birefringence liquid crystal molecules positioned between an upper polarizing plate and a lower polarizing plate, wherein the upper polarizer has first transmission axial direction having a 45°
difference with a second transmission axial direction of the upper polarizing plate. - View Dependent Claims (20)
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Specification