TW565737B - Liquid crystal projection device using ferroelectric liquid crystal (FLC) modulator - Google Patents

Abstract

A liquid crystal projection device using ferroelectric liquid crystal (FLC) modulator is provided, in which the ferroelectric liquid crystal (FLC) modulator receives the light beam that advances along the incident optical path route. The ferroelectric liquid crystal (FLC) display modulates the light beam into an image beam and reflects the image beam along the reflective optical path route. The incident optical path route and the reflective optical path route constitute a non-zero angle thereby increasing the contrast of image.

Description

〇 737 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention is a single device, especially a liquid crystal projector using a reflective liquid crystal modulator (FLC). Emission type ferroelectric liquid crystal modulator in liquid crystal projection device [Prior art] Please refer to the first figure and the influencing factors such as the slow response speed of the liquid crystal molecule 10a cause the actual rotation angle of the liquid crystal molecule 10a 0 cannot reach the standard 90 degrees (the virtual part is the actual liquid crystal rotation position), and the 0 angle is often less than 90 degrees, so that the TN-type or STN-type liquid crystal display panel is used in the LCD projection device display system The liquid crystal display liquid crystal display panel used by the Luo province Yuezhi liquid crystal projection device of the TN type or STN type is a liquid crystal display panel (f-day display panel, but the TN type or STN type is divided). The theoretical rotation angle of 90 degrees (solid line light Λ [Λ eight molecules 10a to rotate the incident light, so it can be used as the theoretical rotation angle of f Yin Erzhi = knife 10 a often due to the liquid crystal display panel, 、 Guangcai's variation factors may be used in the operating temperature is too high or too low, and the temperature of the LCD is 1 aa, and Pang Du Tang Taide stems Heixiang raben ·, is: ίΛ 古 左 Y 刀 Ί 尔 钓1 | Tight Xinjing hard mattress bait)) and money y caused by the TN type or STN type liquid crystal display panel With ..... ~κ, τ, / ~, 'of its projected image contrast than the contrast of the difference between the theoretical and the TN type; of TN-type liquid crystal display panel has a larger defects, i.e. liquid crystal molecules rotation

The response time required to control the grayscale brightness of the light from an angle is longer, which affects the usability of the TN or STN type liquid crystal display panel. Therefore, when using the TN or STN type liquid crystal display panel to continuously display the same screen for a period of time before switching to another screen, it has little effect on the user, but if you want to use it to watch animations or movies, this Due to the continuous and rapid change of the day and day, for example, a continuously changing picture may see a blurred image, so the long response time will affect the picture quality. In addition, the TN or STN type liquid crystal display

565737 V. Description of the invention (2): Based on the above disadvantages, i has a higher cost, so it is not suitable for use in projectors. ^ Second, in order to improve the above disadvantages and reduce the cost of the projector = ί τί 广 display board ( m): The biggest advantage of this ferroelectric liquid crystal display panel (FLC) compared to the liquid crystal display panel of _ 3 i is that the ferroelectric liquid is called θ〆r〇 " 〇 (〇F " LY STN " " " Disadvantage tii overcome the problem of watching the animation B to generate image blur. Therefore, the ferroelectric liquid crystal display panel (FLC) is suitable for a liquid crystal projection device. As shown in the second figure, the liquid crystal projection device includes a light source 20a, Photon lens module 30a, ferroelectric liquid crystal display panel (Flc) 40a, and projection lens group 50a. The optical lens module 30a includes a transparent color plate 31a, a front lens 32a, an integrating unit 33a, and a polarization conversion element 34a. The rear lens group 35a and the polarized light 稜鏡 3 6a are arranged in this order. The light beam of the light source 20a penetrates the optical lens module 30a and is projected to the light path 60a. The ferroelectric liquid crystal display panel (FLC) 4〇a, by this ferroelectric liquid crystal display panel (FLC) 4〇a The beam is modulated into an image beam and reflected along the second optical path 70a through the polarization conversion element 34a, and then projected to the projection lens group 50a, so that the image beam is projected by the projection lens group 50a The first optical path 60a is parallel to the first optical path 70a, and although the image projected by the liquid crystal projection device improves the blurred image phenomenon in the dynamic picture, the contrast of the image is more useful. The TN or STN type liquid crystal display panel is inferior. Therefore, the 'blame it' is that the liquid crystal molecule rotation angle of the ferroelectric liquid crystal display panel (FL c) is ± 22.5 degrees, and because of the imperfect book frame structure (non — Ideal bookshelf structure), causing the rotation angle to decrease

565737 V. Description of the invention (3) Small (see the third figure, the solid line is the theoretical position and the rotation angle is 0 1, the dotted line is the actual position, and the rotation angle is 0 2 and 0 2 < 0! ), So the contrast of the projected image is not good, so how to take advantage of the short response time characteristics of the ferroelectric liquid crystal display panel (FLC), improve the contrast of the image, and reduce the manufacturing cost of the projector and become an important issue. The reason is that the inventor based on these deficiencies and based on years of relevant experience in manufacturing products, carefully observed and researched them, and devoted himself to studying and cooperating with the application of science, to propose a present invention with a reasonable design and effective improvement of the aforementioned deficiencies. SUMMARY OF THE INVENTION One object of the present invention is to provide a liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) to increase the contrast of an image. Another object of the present invention is to provide a liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) to provide the applicability of the ferroelectric liquid crystal modulator to a projection device. A third object of the present invention is to provide a liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) to reduce the manufacturing cost of the liquid crystal projection device. According to the foregoing object of the present invention, the present invention is a liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC). The liquid crystal projection device includes a ferroelectric. Liquid crystal modulator (FLC), which receives a path along an incident optical path. For the traveling light beam, the ferroelectric liquid crystal display panel (FLC) modifies the light beam into an image light beam and reflects the image light beam along a reflected optical path path, and the incident optical path path forms a non-zero angle with the reflected optical path path system. A liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC).

565737 V. Description of the invention (4) Including light source, optical lens module and ferroelectric liquid crystal modulator (FLC) The light source provides a light beam, and the optical lens module receives the light beam and emits the light beam along an incident optical path The ferroelectric liquid crystal modulator (FLC) is disposed on the incident optical path and receives the light beam, and modifies the beam into an image beam and reflects the image beam along a reflected optical path, the incident optical path A non-zero angle is formed with the reflected optical path.

A liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC), wherein a light source emits a white light beam, a plurality of ferroelectric liquid crystal modulators are used to modulate light into light with an image, and a dichroic element receives the white light beam, and The white light beam is classified as a complex dichroic light according to the wavelength. The dichroic lights are respectively incident on the ferroelectric liquid crystal modulators according to the path of the incident optical path, and the complex dichroic light having an image is reflected according to the path of the reflected optical path. The incident optical path and the reflected optical path form a non-zero angle, the light combining element is disposed on the reflected optical path, and the two-light phase adjustment element is disposed on the light combining element and two of the irons. The path of the reflected optical path of the electric liquid crystal modulation device. In order for your examiner to better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, but the drawings are provided for reference and explanation only, and are not intended to limit the present invention. [Embodiment]

Please refer to the fourth figure. The present invention is a liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC). The ferroelectric liquid crystal modulator (FLC) 10 receives a light beam traveling along an incident optical path 20, And modulating the beam into an image beam, and reflecting the image beam along a reflected optical path 30, the incident optical path

Page 7 565737 V. Description of the invention (5) 2 0 series forms a non-zero angle with the reflected optical path path 30 0, so that the visual rotation angle of the liquid crystal molecules in the ferroelectric liquid crystal modulator (FLC) 1 0 Larger, thus increasing the contrast of the image projected onto the projection screen. When the liquid crystal projection device uses a monolithic ferroelectric liquid crystal modulator (FLC) 10, the liquid crystal projection device includes a light source 40, an optical lens module 50, and a ferroelectric liquid crystal modulator (FLC) 10 And projection lens group 60, the light source 40 provides a light beam, the optical lens module 50 is used to receive the light beam, and emits the light beam along an incident optical path 20, the ferroelectric liquid crystal modulator (FLC) l0. It is arranged on the incident optical path 20 to receive the light beam and modulate it into an image beam, and reflects the image beam along the reflected optical path 30. The incident optical path is from 20 and the reflected optical path. The 30 ° system forms a non-zero angle, and the 60 ° projection lens group is disposed on the reflected optical path 30, and receives the image beam, and projects the image beam. Wherein, the optical lens module 50 has an optical axis 70, the optical axis 70 is parallel to the incident optical path 20, and the optical lens module 50 is a color disc 51, a front lens 52, The integrating unit 53 and the polarity conversion element 54 are included, and are sequentially arranged on the same optical axis 70 to receive the light-transmitting color plate 51 to modulate the light beam to a length of skin, and to equalize the beam: soil two Polarization, the liquid crystal projection device further includes a lens 80, f is placed in the ferroelectric liquid crystal modulator (FLC) 10, and the system receives the image light beam and projects to the projection ... ,, , B for the blocks with three primary colors. Before shooting the lens group 60, and the transparent color disc 51

Among them, the present invention uses ferroelectric TN-type and STN-type liquid crystal displays, and the liquid crystal modulator (FLC) 10 replaces the original reason.

565737 V. Description of Invention (6)

The response time of (FLC) 10 is faster than that of the TN or STN type liquid crystal display, and the visual rotation angle of the ferroelectric liquid crystal molecules in the ferroelectric liquid crystal modulator (FLC) 10 is increased, so that the projection to The image contrast of the projection screen is increased. Please refer to the fifth figure, the angle 0 of the object 90 is 45 degrees, so when the angle of the object 90 is observed at point A, the angle of the object observed by the observer is similar to the original. High angle of view, that is, when observing the angle of 90 of the object at point B, the angle of 0 2 of the object observed by the observer will be greater than 0 1 degree (as shown in the sixth figure), but when the angle of view is lowered to point C The included angle of the object 90 and the point C is lower than the point A. The included angle 0 3 of the object 90 observed by the observer will be less than 0 1 degree (as shown in the seventh figure), so it is used for the observation of the point B Principle In the present invention, the object 90 can be regarded as the ferroelectric liquid crystal molecules in the ferroelectric liquid crystal modulator (FLC), and the rotation angle between the two ends of the rotation of the ferroelectric liquid crystal molecules can be regarded as the The included angle of the object 9 0 is 0 1, so the visual rotation angle of the rotation angle of the ferroelectric liquid crystal molecule is larger than the original angle. Therefore, when the light beam enters the ferroelectric liquid crystal modulator at an oblique angle, it is as if observed from B Observe the object 90 at a point, so in this embodiment, the angle between the incident light beam and the reflected image light beam is increased, so that Measuring the rotational angle observes the ferroelectric liquid crystal molecules is increased,

When the rotation angle is increased, the light-dark contrast of the ferroelectric liquid crystal molecular image increases, and the contrast of the image projected onto the projection screen increases. Therefore, as shown in the fourth figure, the light beam follows the incident optical path 2 0 enters the ferroelectric liquid crystal modulator (FLC) 10, and the ferroelectric liquid crystal modulator (FLC) 10 reflects the image light beam along the second optical path length 3 0, and the incident optical path 2 0 and the second optical path length 3 0 form a non-zero angle, which increases the light and dark contrast of the image

Page 9 565737 V. Description of the Invention (7) ·

In addition, please refer to the eighth figure, wherein the projection device can be a three-chip ferroelectric liquid crystal modulator 10 (FLC). The device causes the light beam of the light source 40 to pass through the integrating unit 53 and enter the color separation element. 100, the dichroic element 100 receives a white light beam, and distinguishes the white light beam into red, blue, and green dichroic light according to the wavelength. The dichroic light is incident on the ferroelectricity according to the incident optical path 20 respectively. Liquid crystal modulator 10 (FLC). These ferroelectric liquid crystal modulators 10 (FLC) modulate the dichroic light into dichroic light with an image, and reflect the diffracted light with an image according to the reflected optical path 30. Colored light, and incident on the light combining element 16 0, and the incident optical path paths 20 and the reflected optical path paths 30 form an angle between 0 and 20 degrees to 40 degrees, and the two light phases are adjusted The elements 1 3 0 are respectively disposed on the reflected optical path paths 30 of the two ferroelectric liquid crystal modulators 1 0 (FLC) to adjust the light phase of the two color-separated light having an image, and the The projection lens group 1 2 0 receives the dichroic light with an image collected by the light combining element 110 and projects the light. Projection mirror group 1 2 0. Another three-polarization element 140 is correspondingly disposed on the incident optical path 20, respectively, to polarize the dichroic light into polarized light, and the polarization element 140 may be a polarizer. There are three purification elements 150, which are respectively disposed on the reflected optical path 30, and are used to purify the spectroscopic images. The purification elements 150 can be polarizers, as described above. The dichroic element 100 is a cross dichroic element, and the dichroic element 100 is a SPS dichroic element.

In summary, the "liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC)" according to the present invention has the advantages of increasing the contrast of an image and reducing the manufacturing cost of the liquid crystal projection device, and making the ferroelectric liquid crystal display panel (FLC ) Is more suitable for use in liquid crystal projection devices.

Page 10 565737 V. Description of the invention (8) However, the above description is only a preferred and feasible embodiment of the present invention and is limited to the patent scope of the present invention. Therefore, any equivalent structural changes made by using the description of the present invention are the same. All the theories are included in this post and given to Chen Ming. The scope is not limited by the description and illustration. 565737 Brief description of the drawings [Simplified description of the drawings] The first picture is a schematic view of the theoretical rotation angle and the actual rotation angle of the conventional TN or STN type liquid crystal molecules. The second picture is a conventional liquid crystal. Side view of the projection device. The third diagram is a conventional schematic diagram of a predetermined rotation angle and an actual rotation angle of a ferroelectric liquid crystal molecule at a temperature higher than the working temperature. The fourth diagram is a liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) according to the present invention. The fifth view is a schematic view of the observation position of the present invention. The sixth view is a view of point B of the present invention. The seventh view is a view of point C of the present invention. The eighth view is a three-chip ferroelectric liquid crystal modulation of the present invention. Perspective view of the LCD projection device of the projector [reference number in the figure]

Conventional liquid crystal molecules 1 0 a light source 2 0 a optical lens module 30 a The ferroelectric liquid crystal modulator of the present invention 1 0 incident light path 2 0 reflected light path 3 0

Translucent color disc 31a Front lens 32a Integrating unit 3 3 a Polarization conversion element rear lens group 3 5 a Polarizing prism 3 6 Light transmission 34a Front product a Polar source 40 Science lens module 5 0 Light color disc 51 Lens 52 Sub-unit 5 3 Sex conversion element 5 4

Page 12 565737 Simple illustration of the ferroelectric liquid crystal display panel 40a projection lens group 5 0 a first optical path 60a second optical path 70a ferroelectric liquid crystal molecules 8 0 a

Rear lens 5 5 Projection mirror group 6 0 Optical axis 7 0 Lens 80 Object 90 Color separation element 1 0 0 Combined light element 1 1 0 Projection mirror group 1 2 0 Optical phase adjustment element 1 3 0 Polarization element 1 4 0 Purification element 1 5 0 p. 13

Claims (1)

565737 VI. Application Patent Scope 1. A liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC), the liquid crystal projection device includes: a ferroelectric liquid crystal modulator (FLC), which accepts travel along an incident optical path For the light beam, the ferroelectric liquid crystal display panel (FLC) modulates the light beam into an image light beam and reflects the image light beam along a reflected optical path path, and the incident optical path path forms a non-zero angle with the reflected optical path path system. 2. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) as described in item 1 of the scope of the patent application, wherein the incident optical path path and the reflected optical path path form an angle of 20 to 40 degrees . 3. —A liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC), which includes: a light source that provides a light beam; an optical lens module that receives the light beam and emits the light beam along an incident optical path; ferroelectricity A liquid crystal modulator (FLC) is disposed on the incident optical path, receives the light beam, modulates the beam into an image beam, and reflects the image beam along a reflected optical path. The incident optical path and the The reflected optical path path forms a non-zero angle. 4. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) as described in item 3 of the scope of the patent application, further comprising a projection lens group, which is arranged on the reflected optical path and receives the image beam And project the image beam. 5. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) as described in item 4 of the scope of patent application, which further includes a lens, which is provided in the Page 14 565737 VI. Scope of patent application The ferroelectric liquid crystal modulator (FLC) is used to receive the image beam and project to the projection lens group. 6. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC)-as described in item 3 of the patent application scope, wherein the optical lens module has an optical axis, and the optical-axis system and the incident optical path parallel. 7. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) as described in item 3 of the scope of patent application, wherein the optical lens module includes a transparent color plate, a front lens, an integrating unit, and a polarity conversion element. , Rear lens, and are sequentially arranged on the same optical axis to receive the light beam and tune it into light beams with different wavelengths, homogenize and polarize it. 8. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) φ as described in item 7 of the scope of the patent application, wherein the light-transmitting color disk has blocks of three primary colors for forming the light beam into colored light of different wavelengths. . 9. A liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC), comprising: a light source that emits a white light beam; a plurality of ferroelectric liquid crystal modulators for modulating light into light with an image; a color separation element It receives white light beams, and distinguishes the white light beams as complex dichroic light according to the wavelength. The dichroic lights are respectively incident on the ferroelectric liquid crystal modulators according to the incident optical path and reflected by the reflected optical path. The φ complex has dichroic light of the image, the incident optical path and the reflected optical path form a non-zero angle; the light combining element is disposed on the reflected optical path; and Page 15 565737 6. Scope of patent application The two-light phase adjustment element is set on the reflected optical path of the light combining element and two of the ferroelectric liquid crystal modulation devices. 10. According to the liquid crystal projection device using the ferroelectric liquid crystal modulator (FLC) described in item 9 of the scope of the patent application, the ten incident light path paths and the reflected light path paths form 20 degrees to 40 degrees Angle. 1 1. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) as described in item 9 of the scope of the patent application, further comprising a plurality of polarizing elements, which are respectively disposed on the path of the incident optical path to ground, and In order to polarize the light into polarized light. 1 2. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) according to item 9 of the scope of the patent application, further comprising a plurality of purification elements, which are respectively disposed on the path of the incident optical path to To purify these spectroscopic images. 13. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) according to item 9 of the scope of patent application, further comprising an integrator, which is disposed between the light source and the color separation element to integrate the light source Of the beam. 1 4. The liquid crystal projection device using a ferroelectric liquid crystal modulator (FLC) as described in item 9 of the scope of patent application, wherein the color separation unit is a cross color separation. Page 16