TW323339B - - Google Patents

Description

A7 B7 printed by Beigong Consumers ’Cooperatives, Central Bureau of Economics and Development, Ministry of Economic Affairs V. Description of the invention (i) Cross-reference of related applications This application is the US Journal No. 08 / 242,525 (US Serial No. . 08 / 242,525), titled "Continuous Part of Illumination System Employing an Array of Microprisms", and US Patent No. 5,428,468 is No. 08 / 149,219 issued on November 5, 1993 (US Serial No. 08 / 149,219) is titled "Backlighting Apparatus Employing an Array of Microprisms", which is now included in each US Patent No. 5,396,350 for wheat photos. Scope of the Invention This invention generally relates to an illumination assembly that provides a polarized light source, and particularly relates to a specially designed backlight structure that can provide parallel polarized light sources at two vertical viewing angles, and is particularly suitable for liquid crystal displays or other polarized light sources Application Background of the Invention Liquid crystal screens (LCDs) are commonly used in portable computer systems, display systems of other electronic facilities and communication facilities of televisions. An example of an LCD screen is illustrated in a circle in circle 1. The overall screen is composed of some form of backlight device, roughly designated 50, an input light polarizing device 52, a liquid crystal light modulator 54, a selective output light polarizing device 56, and a display device 58. The liquid crystal light modulator is basically a light valve that allows light transmission in the first state and blocks transmission in the second state. The contrast ratio and brightness must be improved in the personal computer system. Therefore, the backlighting of the LCD has become the most common -4- This paper standard is applicable to the Chinese National Standard (CNS) A4 specification (210X 297 public) (Please read the precautions on the back before filling in this page) Κ 装 ·, 1Τ This 23339 ΑΊ Β7 is printed by the Beigong Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. The description of the invention (2). The light source seen. However, only about 12% of the traditional monochrome LCD screens are transmitted, and only about 2% of the color LCDs screens. Transmission. Therefore, a large amount of light is required to provide a visible display, which creates a problem not only of efficiency, but also of energy and space requirements, especially for portable LC D s »LCDs — special shortcomings that may cause The inefficiency of all systems is the characteristic that requires polarized light. Most polarizers are not effective, and nearly 60% of the light source is absorbed by it. This absorption effect limits the brightness of the screen and causes the overall energy efficiency of the LCD to decrease. Therefore, it is necessary An art of optics and lighting to provide an effective lighting device that can transmit accurate polarized light sources to increase luminosity and the transmission efficiency of all light. SUMMARY OF THE INVENTION The present invention is a light The lighting system can provide individual or combined polarized light sources that are diffuse or substantially parallel (hereinafter referred to as spatially straight polarized light sources). In addition, the present invention can be applied to any lighting application that requires low laterally spaced straight polarized light sources When applied to LCD, this invention can be used as a backlight to transmit a substantially parallel polarized light source. The advantage is that since the light has been fully polarized in the proper orientation, the light absorbed by the input polarizer can be minimized, or even eliminated Input polarizer. This optical illumination system includes an optical transmission device with substantially flat top and bottom surfaces, with opposing sides arranged between the top and bottom surfaces; a device to direct light into the aforementioned optical transmission device; and an optical device The reflecting device connected to the top surface moves the light from the light transmitting device and redirects the direction; a polarizing device located between the top surface and the light reflecting device transmits the light of the first polarization state from the light transmitting device. Be polarized. Be converted into the second polarized state and apply the Chinese National Standard (CNS) 84 specifications (210X297 public daughter) to the full paper scale ( Read the precautions moraine and then fill in the back of this page) Κ equipment - Order

A Fifth Ministry of Economic Affairs, Central Bureau of Standards, Employee and Consumer Cooperative Institution A7 B7 Description of the invention (3) The remaining light that is not transmitted by the polarizing device is recycled to the aforementioned transmitting device to be converted into the first polarized state, or randomly polarized The light polarized into the first polarization state is transmitted through the polarization device. This cycle continues until all input light is either transmitted by the polarizing device as a polarized light source, or it disappears from the optical system due to different losses such as scattering or absorption. In one embodiment, a light source is located adjacent to the light receiving surface of the light transmitting device. The light transmission device can be any structure that transmits light through reflection, such as a light pipe, a wedge, a waveguide, or any other structure known in the art. The optical transmission device preferably includes a waveguide to receive the light generated by the light source and transmit the light via total internal reflection (TIR). On one surface of the waveguide is an optical polarization device with a microprism array attached to it. Each microprism includes a light input and a light output surface, and the light output surface is optically connected to the light polarizing device. In addition, the micro-prism includes four side walls, at least one of which forms a special angle, so that the light beam is captured by the microlens when it penetrates the waveguide, the direction is changed by the side wall at a specific angle, and the TIR reflection penetrates through the micro-prism. The micro-lens reveals that it is a straight and light source in space. A spatially straight polarized light source means including a parallel polarized light source that is substantially perpendicular to the light output surface, or a polarized light source that is nearly orthogonal to the light output surface. In an alternate embodiment, an array of microlenses is effectively arranged In the vicinity of the light output surface of Hiroshi. These microlenses form the curvature and configuration of the Xiaodang so that the light emitted from each microlens is directed toward at least one corresponding microlens. Light transmission penetrates the microlens and becomes a more parallel polarized light source. The outlined description of the enclosed circle-6- This paper & degree is applicable to the Chinese National Standard (CNS) A4g (210x 297mm) (Please read "Precautions on the back side and then fill out this page")-Binding-Order the Central Standards of the Ministry of Economic Affairs Printed by Bureau Cooper Consumer Cooperative ^ 23339 A7 ----------- B7____ 5. Description of the invention (4) Circle 1 is a schematic diagram of the early LCD with backlighting technology; Ming 2 is P-polarized and s-the recovery coefficient circle of polarized light; circle 3 is a schematic diagram of the lighting system of the present invention; FIG. 4a is an embodiment of a suitable reflecting device connected to the present invention; circle 4b is an embodiment of a polarizing film; FIG. 4c It is another alternative embodiment of the polarizing film; circle 4d is a further embodiment of the polarizing film; circle 5a is a comparative embodiment of the reflecting device connected to the present invention; FIG. 5b is an alternative circle of the reflecting device; circle 6 Front view of a microlens array connected to a suitable reflecting device; Fig. 7 is a specific embodiment of the polarizing film in Fig. 4b; circles 8a-b are p-polarizing and 8 • polarizing light of the polarizing film in circle 7 The reflection coefficient circle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will appear in the form of a combination of backlighting of an LCD screen for the purpose of providing illumination; however, the present invention can be applied to any place that requires low lateral space to directly bias the light source. In the embodiment, linear polarization is used to form a polarized backlight by forming multiple layers on the surface of the waveguide. The cover must have an alternating layer structure of high and low index materials. This cover makes use of ρ • polarized light (linearly polarized light, which has a polarizing effect vector on the plane containing the incident, reflects and transmits the beam) when light strikes an interface at some non-perpendicular angle of incidence. Polarized light (linear polarized light with a polarizing effect vector on the incident plane, reflected and refracted light beams) Different reflections This paper size uses the Chinese National Standard (CNS) M specifications (210 X297 mm) (please read the back first (Please fill out this page again)

, 1T · Ι- I- -I j · A7 B7 has been printed by the Central Bureau of Industry and Commerce, Co., Ltd. Printed%. 5. The optical properties of the description of the invention (coefficient (Fissley coefficient). At a specific angle (Brewster, s *) The reflection coefficient of p-polarized light is close to zero. Brewster, s angle is defined as: 9 Brwwitef = tail I (-*-) Πι where h is the refractive index of the second substance and ... is the first substance (including incident The refractive index of the material of the beam) qualitative circle of the reflection coefficient at all angles is shown in Figure 2. At the interface between Ti02 (assuming n2t2_6) and si〇2 (ni = i.46), Brewster's angle is about 61 °. This is Typical angle at which light travels in a waveguide. The polarization effect of a Ti〇2 / Si〇2 double layer is about 5-10%. To achieve a larger effect, multiple layers of Ti〇2 and Si〇2 can be stacked alternately. The stack is assembled on one surface of the waveguide. Another embodiment of the present invention utilizes a ring-shaped polarizing effect to manufacture a polarized backlight by manufacturing an ester liquid crystal layer on a surface of the light guide. The plane is positive The cholesteric liquid crystal will be polarized into the cholesteric spiral in the same way in the incident light The composition, and the transmission of other components β normal incident wave is within a few. The reflected light = ηρ, where n = (ne + n〇) / 2 'is the average refractive index expressed by the binomial index of the abnormal refractive index and the general refractive index Rate; p is the pitch of the cholesteric liquid crystal spiral. The bandwidth of the reflected light is △ Α = λ〇Δη / η, where = is birefringence. The oligoester liquid crystal polymer film of Sui Ding can be passed through the use of chiral liquid crystal double acrylate Manufactured by in-situ photopolymerization. Moreover, a cholester polymer film with a pitch pitch can be used to cover the entire visible light spectrum and a wide angle of incidence. For example, a 15; / m thick ester polymer film, which is in the film P = 240nm on one side and linear increase to 410nm on the other side, can be used as a good broad-band and wide-angle reflective ester polarizer, such as DJ Broer et al. (CNS) A4 specification (210X297 gala) (Please read the precautions on the back before filling in this X)-Pack. A7

The policy of the Ministry of Economic Affairs, Central Bureau of Standards, page work, consumer capital, and cooperatives was published in Proceedings of Asia Display '9 5, P.73 5 (1 995). A lighting system according to the invention is shown in circle 3. It must be understood that all ® shapes are only structural descriptions, and actual and relative sizes will differ. It should also be understood that the units shown in the circle may not necessarily be continuous, but only the adjacent 0 lighting system 12 includes a light source 14 and a light guide 16. The light guide may be any structure that transmits light by reflection, such as a light pipe, a wedge, a waveguide, or any other structure well known in the art. The light guide 16 can be penetrated by light having a wavelength from about 400 to about 700 nm. The refractive index of the light guide 16 ranges from approximately 1.40 to 1.65. The optimal refractive index is about ι · 45 to about 1.60. The light guide 16 can be made of any transparent solid material. Suitable materials include transparent polymer, glass and fused silica. The required properties of these materials include mechanical and optical stability at the typical operating temperature of the equipment. The best materials are glass, acrylic, polycarbonate and polyester. A surface of the light guide 16 is a polarizer film 44 which is constructed to transmit the light in the first polarized state and reflect the light in the second polarized state. Β is optically connected to the polarizer film 44 as a reflecting device 18. It has a light input surface to capture the light transmitted by the polarizer film 44 and one or more surfaces to change the direction of the light and output the light as a spatially straight polarized light source. Exemplary reflector devices are disclosed as U.S. Registered Patent Nos. 5,161,041, Japanese Publication Nos. 5-45505, 5-89827, 5-333334 and 5-127159. The preferred reflector device is disclosed in US Registered Patent Nos. 5,396,350 to Beeson et al. And 5,428,468 to Zimmerman et al 6 • 9- This paper size is applicable to the gg standard; CNS) Λ4 specification (210X297 mm) (please first Read the precautions on the back and then fill out this page.) Packing and Ordering 323339 A7 The Ministry of Economic Affairs, the Central Committee of the Ministry of Economic Affairs, the Beigong Consumer Cooperation Du Printing Co., Ltd. The preferred reflector device 18 is for illustrative purposes only and not to limit the scope of the invention. Referring to the circle 4a, the reflecting device 18 includes an array of microlenses 28, as disclosed in U.S. Registered Patent No. 5,396,350. The light beam passes through the TIR reflection through the light guide 16, a polarized light beam is transmitted through the polarizer film 44 and can enter the microlens 28 through the light input surface 30, reflected off the side wall 33 and exited through the light output surface 32 The prism 28 becomes a spatially straight polarized light source. The bottom surface of the light guide 16 is a polarizing conversion layer 48. The polarization conversion layer 48 can convert the first polarization state to the second polarization state, and vice versa. An example of the polarizing conversion layer is a birefringent layer, which can be designed to change: (a) the first linear polarization state to the second linear polarization state; (b) the first ring polarization state to the second ring shape Polarized state; (c) Linear polarized state to circular or elliptical polarized state; (d) Circular or elliptical polarized state to linear polarized state. The thickness of the birefringent layer is usually converted from the wavelength of light from one polarization state to another polarization state! Measured in the birefringent layer) determined by "for example, if the wavelength of light is 500 nm and the birefringence of the material of the birefringent layer △ n = 0.1〇, the layer thickness of the polarization conversion 1/4 wavelength is 500 / (4x0.10) nm or 12 50 nm. This assumes that the light passes in a direction perpendicular to the plane of the polarization conversion layer 48. If the light is conducted in the direction of Ψ angle from the vertical direction, it must be multiplied by the correction term of c 〇 s ψ to obtain an equivalent 1/4 wavelength thickness. In the following examples, we will assume the thickness of 1/8 wavelength, 1/4 wavelength and 1/2 wavelength obtained by equal thickness corrected by the average incident angle of light in this special case. Another example of the polarization conversion layer 48 is a metal mirror layer. The light hits the metal mirror and undergoes a phase shift of 18 °. Therefore, a metal mirror can convert right-handed polarized light to -10. This paper scale is applicable to the country (⑽) from the threat (2 similar to 297 Gong) (Please read the precautions on the back and fill in this page) r

, 1T A7 B7 Central Ministry of Economic Affairs, Central Bureau of Accreditation, Industry, Consumers, and Investment Cooperation Du Printing. V. Description of Invention (8) Left circular polarized light, and vice versa. Unpolarized light can be regarded as composed of equal parts of different polarization states. These two states can also be regarded as two linearly polarized states orthogonally oriented to each other, or represented by the right circular polarized state and the left circular polarized state. In the embodiments of the present invention shown in circles 4 & 41 >, the polarizer film is designed to transmit a specific linear polarization state. In ®4a, the unpolarized light beam 50 is emitted by the light source 14 and passes through the light guide 16 via TIR »The unpolarized light coil is shown as two equal and vertical linearly polarized lights. The polarizing vector is parallel to the incident surface and the beam reflected at the position of the polarizer film 44 is P-polarized 'and the polarized vector is perpendicular to the incident surface and the reflected beam is called S-polarized. In this example, the polarizer film 44 is a multilayer stack of different layers with different refractive indices ~ and η2, as shown by the circle 4b, which is mounted on the surface 17. Examples of materials that can be used to make the membrane 44 are disclosed in US Patent 4,974,219 to Korth, including AO2 (Ti02) and SiO2 (Si〇2). Optically connected to the film 44 is the reflecting device 18. The film 44 transmits a first linear polarized component, here a P-polarized vector, and reflects a second linear polarized component, here a P-polarized state. The P-polarized light can be transmitted through the reflective device and transmitted as a spatially polarized light source. The S-polarized light continues to pass through the TIR in the light guide and becomes a light beam 150 until it hits the polarization conversion layer 48, converting all or selective portions of the bottom surface of the light guide 16. If the polarized light conversion layer 48 is a birefringent 1/8 wavelength layer, the light beam will penetrate the layer 48 downwards and reflect off the bottom surface of the layer 48 through TIR due to the bottom surface contacting the air, and penetrate the layer 48 a second time and return to the light guide 16. Since the beam passes through the birefringent layer 48 twice and is delayed by a total of 1/4 wavelength, the S-polarized beam 150 will be converted into a ring-shaped polarized beam 250, which is equivalent in effect to the same amount of S-polarized light and P- Polarized light or randomly polarized light-11- (please read the note Ϋ on the back side and fill in this page). Packed. The size of this paper is applicable to China National Standard (CNS) A4 (210x297mm) Economy Ministry of Central Prototype Bureau Zhengong Consumer Cooperative Printed Α7 Β7 V. Invention description (9) bundle. The light beam 250 shown in the circle 4a is composed of the same amount of P-polarized light and S_polarized light. The light beam 250 may pass through the polarizing film 44 and split into its S-polarized light composition and P-polarized light composition again. Among them, the S-polarized light composition will be reflected by the polarizing film 44, and the P-polarized light composition may be transmitted to the reflecting device 18, and emitted from the reflecting device as spatially polarized light. In another embodiment of the present invention, the polarization conversion layer 48 of all or selective portions of the bottom surface of the conversion waveguide 16 is constructed of a birefringent material to form a 1/4 wavelength layer. In this example, the S-polarized light beam 150 will penetrate the layer 48 downwards, reflect the bottom surface of the layer 48 through TIR due to the bottom surface contacting the air, penetrate the layer 48 upward again, and then return to the light guide 16. Due to the second pass through the layer 48, the beam undergoes a retardation of 1/2 wavelength ' S-polarized beam 150 will be converted to P-polarized light. The ρ · polarized light can then pass through the polarizing layer 44 and the reflection device 18, and can be transmitted out of the reflection device 18 into a spatially straight, light. In yet another example of the present invention, shown as H4a and 4c, the polarizing film 44 includes at least a ring-shaped polarizing material such as cholesteric liquid crystal which transmits the ring-shaped polarized light in the first state (eg, right ring-shaped polarized light) and reflects the second state Layer 45 of ring polarized light (left ring polarized light in this example). The light beam in the first annular polarization state can penetrate the polarizing film 44 and can enter the micro-prism 28 in the reflecting device 18 through the light input surface 30, reflect off the side wall 33 and exit the microlens 28 through the light output surface 32, becoming The open-ended straight circular polarized light source. The polarizing film 44 may optionally be composed of a quarter-wavelength polarizing conversion layer 46 plus a ring-shaped polarizing layer 45. The light in the first ring polarized state is transmitted by the layer 45 and then penetrates the 1/4 wavelength birefringent polarization conversion layer 46, which converts the ring polarized light into linear polarized light. The linearly polarized light transmitted through the 1/4 wavelength layer 46 can enter the microprism 28 through the light input surface 30, and reflect off the side wall. -12- This paper is again applicable to China National Standards (CNS) A4 specifications (210Χ: 297 mm) (Please read the precautions on the back before filling in this page) 、 · * 0

323339 A7 B7 5. Description of the invention (10) (Please read the notes on the back before filling in this page) 33 printed by the Central Standards Bureau of the Ministry of Economic Affairs and Industry and Consumer Cooperatives and left by the light output surface 32 to leave the humi 28 as a space pen Linear polarized light. In this example, the polarization conversion layer 46 is in optical contact with the ring-shaped polarization layer 45. The reflecting device 18 can be arbitrarily placed between the ring-shaped polarizing layer 45 and the polarized light conversion layer 46, so that the layers 45 and 46 do not have physical contact. The light in the second ring-shaped polarized state that is initially reflected out of the polarizing film 44 will penetrate the light guide 16 and interact with the polarization conversion layer 48. In one embodiment of the present invention, the polarization conversion layer 48 is a birefringent 1/4 wavelength layer, so that the light in the second ring polarized state will pass downward through the layer 48, reflected by the bottom surface of the layer 48 through TIR, and go up second The secondary penetration layer 48 then returns to the light guide 16. Since the light beam of the second ring polarized light passes through the retardation of 1/2 wavelength after passing through the layer 48 twice, the light is converted into the first ring polarized state (in this case, right ring polarized light), and the polarized light can be transmitted at this time The layer 44 and the reflection device 18 are transmitted through the reflection device 18 to become spatially polarized light. In another embodiment of the invention, the polarization conversion layer 48 is a metal mirror. A metal mirror changes the state of the reflected light by 180 ° relative to the incident light. Therefore, a metal mirror can change the light in the second annular polarization state to the first annular polarization state. In this embodiment, the second ring-shaped polarized light rays (in this example, in the ring-shaped polarized light) that initially reflect the polarizing film 44 will penetrate the light guide 16 and interact with the polarization conversion layer 48. The metal mirror converts the light in the second ring polarized state into the first ring polarized state (in this example, right ring polarized light), and the light can now pass through the polarizing layer 44 and the reflecting device 18, and from the reflecting device 18 Intermediate transmissivity becomes spatially straight polarized light * A further example of the present invention is shown in FIGS. 4a and 4d, in which the polarizing conversion layer 48 is omitted and the polarizing film 44 is at least composed of a ring-shaped polarizing material such as different cholesteric liquid crystals 47a and 47b Consists of layers of interaction zone. Layer 47a is designed to transmit -13- This paper ^ standard applies to China National Standard (CNS) A4 specifications (2 丨 0 '; < 297 public expense) Yin X Standard Bureau of the Ministry of Economic Affairs Printed by A. B7. 7 DESCRIPTION OF THE INVENTION (11) The first ring polarized state (such as right ring polarized light) and the reflected second polarized state (in this example, left ring polarized light) ^ The first ring polarized light transmitted through the layer 47a can be It enters the reflection device 18 and is emitted by the reflection device 18 into spatially straight circular polarized light. Layer 47b is designed to perform the reverse function of layer 47a. In other words, the 'layer 47b transmits the second annular polarization state and reflects the first polarization state. The light in the second circular polarized state transmitted through the layer 47b can enter the reflecting device 18, and emitted by the reflecting device 18 becomes spatially straight circular polarized light. In this example, the second polarized light reflected by the layer 47a will penetrate the light guide 16 via TIR and will eventually interact with the layer 47b, where it can be transmitted to the reflection device 18 and emitted by the reflection device 18 into space The straight circular polarized light β is reflected by the layer 47b and the first polarized light will penetrate the light guide 16 via TIR and finally interact with the layer 47b, where it can be transmitted to the reflecting device 18 and emitted by the reflecting device into space Straight circular polarized light. In the above example, the light emitted from the portion where the reflecting device 18 and the layer 47a act will have the first annular polarization state. The light emitted from the portion where the reflecting device and layer 47b act will have a second annular polarization state. If it is desired that the light emitted in these two regions have the same ring polarized state, or that the light emitted in these two regions have the same linear polarized state, then the polarizing layer 44 must be formed by the polarization conversion layer 49 a or the polarization conversion layer 49 b Or both of them are provided with annular polarizing layers 47a and 47b. In one embodiment of the present invention, the polarizing layer 44 is composed of ring-shaped polarizing layers 47a and 47b and a polarization conversion layer 49b which is birefringent at 1/2 wavelength. The light emitted from the interaction between the reflective device 18 and the annular polarizing layer 47a will have a first polarized state. The light is transmitted through the annular polarizing layer 47b to have a second polarization state β after birefringence polarization conversion layer 49b, the second polarization state will be converted to the first polarization -14- This paper Lang scale applies to China National Standard (CNS> A4C grid (210X297mm) (Please read the precautions on the back before filling in this page) Ding A7 B7 Printed by the Central Economic and Trade Bureau of the Ministry of Economic Affairs Beigong Pinggong Consumer Investment Co., Ltd. 5. Description of the invention (12) Light state, with the first polarized light State is emitted from the reflection device 18 and the same polarization state when the reflection device 18 acts on the annular polarizing layer 47a. Similarly, the polarizing layer 44 may be composed of the polarizing layers 47a and 47b and the 1/2 wavelength birefringent polarization conversion layer 49a Manufacture a polarized light source. The output of the reflecting device 18 will be completely in the second annular polarized state. In another embodiment of the present invention, the layer 47a is designed to transmit the first annular polarized state, and the layer 47b is designed to transmit the second In the polarized state, the polarization conversion layers 49a and 49b are 1/4 wavelength layers of the birefringent material, and the optical axis of the birefringent polarization conversion material in the layer 49b is aligned with the optical axis of the birefringent polarization material on the layer 49a. 9 (Γ, so linear polarized light can be made The light transmitted by the polarization conversion layers 49a and 49b will be linearly polarized and in the same polarization state. The light will be transmitted to the reflecting device 18 and emitted from the reflecting device 18 to become linear linear polarized light of the space pen. In the example, the birefringent polarization conversion layers 49a and 49b are optically connected to the ring-shaped polarizing layer 47 & and 471) and are located between the ring-shaped polarizing layer 47a or 47b and the reflecting device 18, in another embodiment of the present invention In this case, the birefringence polarization conversion layers 49a and 49b are not optically connected to the ring polarization layers 47a and 47b. In this embodiment, the reflecting device 18 is located in the ring polarization layers 47a and 47b and the birefringence polarization conversion layer 49a And 49b. In the above embodiments, there are several polarization conversion layers 48 on the surface of the light guide opposite to the polarization layer 44. Alternatively, the polarization conversion layer 48 may be located between the light guide 16 and the polarization layer 44. Better The alternative is that the light guide 16 can be made of birefringent material, so that when one state of polarized light penetrates the light guide 16, it can be converted into another polarized state or randomly polarized. -15- (Please Read the notes on the back first Complete this page)

L ir The scale of this paper is applicable to China National Standard (CNS) A4 (210X297mm). 323339 A7 is printed by the Ministry of Economic Affairs, Central Bureau of Standardization, Sanong Consumer Cooperative------------------ ---B7 _____ V. Description of Invention (η) Circles 5 and 5a illustrate an alternative embodiment of Hirano as 90 here, which is disclosed in US Patent Registration No. 5,428,468. In this embodiment, a second polarization state light may continue to circulate in the light guide to be randomly polarized, and then allow the first state polarization to pass through the film 44. This embodiment is useful for a single-lamp embodiment, and is also quite useful for a lighting system composed of two opposite light sources 14 and 14A. Each light source may act as a diffuser element to randomly polarize the reflected polarized beam. In this embodiment, the side walls 96 and 98 are inclined at an oblique and obligatory angle, respectively, and the side walls 97 and 98 form an inclination angle of θ 1 and θ 2. The tilt angle may be equal to angle 02 and the angle may be equal to the angle, but these angles do not have to be the same. Appropriate angle 0 Fanfan solid from about 15 to 50 degrees. The angle of inclination Θ is approximately 0 to 25 degrees. The preferred angle of inclination 0 is from approximately 2 degrees to approximately 20 degrees. Using the addictive method, light in a polarized state may be randomly polarized. Or one of the light sources 14 or 14A can be replaced by a reflecting device such as an eighth or quarter wave plate and a diffuser or reflector. The light in the second polarized state that is not transmitted by the film 44 will be changed to the first polarized state by the reflecting device or randomly polarized, and circulated in the waveguide 16 so that the light beam currently in the first polarized state can be transmitted through the polarizing film 44 , Again leaving the light in the second polarized state to circulate. This cycle continues until all input light is completely transmitted by the film 44 or disappears from the optical system due to scattering or absorption. In an alternative embodiment, the reflecting device 18 is further composed of an array of microlenses 80, as shown by circle 6 . The microlens 80 is disposed relatively close to the microlens 28 and 90. If the optical lens 80 is manufactured by photopolymerization, it is preferably manufactured with the same monomer as the aforementioned microprism, and may have the same or equivalent to the microlens- 16- (Please read the precautions on the back before filling out this page)

X The paper scale is applicable to China National Standard (CNS) Α4 specification (210X297mm). Printed by the Employee Expenditure Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. A7 ___ B7 Fifth, the description of invention (Η) is consistent with the refractive index. However, any transparent material may be used, such as those previously discussed. Preferably, for each microprism, there is at least one relative microlens in a row with its output surface. A spacer 82 separates the microlens 80 from the microlens. The thickness of the spacer 82 is adjusted to the most appropriate level so that The light rays from the microlens are parallel through the microlens 80. The spacer 82 may be made of any transparent material. Preferred materials include transparent polymers, glass and fused silica. The preferred spacer 82 has a refractive index that is the same as or very close to that of the microlens and the microlens 80. Characteristics required for such materials include mechanical and optical stability at typical equipment operating temperatures. The best materials are glass, acrylic, polyacrylic acid and polyester. The micro-lens 28 and 90 and related microlens 90 arrays can be manufactured by any continuous application technology, such as forging, including injection and shrinking, casting, including hot rolling and simple compression casting, and photopolymerization in the mold And the photopolymerization process without using molds. A preferred manufacturing method is to manufacture the reflecting device 18 including a microlens or 90 array, a microlens 80 array, and a spacer 82 as a single integrated element. One of the intrusion points of this method is to eliminate the adjustment error between the micro-prism array and the micro-transparent clock array when the arrays are manufactured separately and then combined in the foregoing manner. Example A computer simulation program was used to calculate the polarization characteristics of a multi-layer coating composed of alternating stacks of titanium dioxide (Din 丨 〇2) and silicon dioxide (Si〇2) on an acrylic matrix (refractive index 149). The multi-layer coverage represents a Fabrr_peroct-type coating design. Assume that the refractive index of the Ti〇2 layer is 2 646; the refractive index of the si〇2 layer is 1.453. The thickness of the Si〇2 and Ti〇2 layers and the number of layers covered by multiple layers were varied to obtain 405 nm, 550 mn, and 650 nm light rays to be perpendicular to 50 °. To 70. Angle -17- This ^ 'long scale is applicable to China National Standard (CNS) 84 specifications (210x297 public). One ---- (please read the precautions on the back before filling this page)

A Binding · Binding 323339 A7 B7 V. Description of the invention (】 5) The best polarization characteristics when incident on the covered surface. The purpose of the design is to produce high S-polarized reflection coefficient and low p-polarized reflection coefficient at the aforementioned wavelength. As a result, it was found that a seven-layer consisting of three layers of Ti〇, and four layers of Si〇2 covered the incident angle between 50 ° and 73. There is a very good polarization selectivity. Figure 7 illustrates this overlay structure. Circles 8 and 8A illustrate the calculated reflection coefficients of p_polarized and s_polarized beams, respectively. It must be understood that the foregoing specific embodiments are merely examples to illustrate the principles of the present invention. Those skilled in the art can make various improvements without departing from the spirit and spirit of the present invention, which are limited only by the following patent matters. (Please read the precautions on the back before filling in this page) Pack. Order

A Printed by the Employee Consumer Cooperative of the Central Ministry of Economic Affairs

Claims (1)

A8 B8 C8 D8 printed by the Industrial and Consumer Cooperatives of the Central Bureau of Economic Development of the Ministry of Economic Affairs 6. Patent application 1. A lighting system that includes a first and second surface that are substantially flat and opposite sides disposed between the two surfaces Light transmission device; a device that receives light into the light transmission device; a reflection device optically connected to the first surface to move light from the light transmission device and re-direct its direction; and a light transmission device between the transmission device and the reflection device Polarizing device; to transmit the light polarized into the first polarization state from the aforementioned light transmission device and reflect the light polarized into the second polarization state; thereby the reflection device transmits the straight polarized light v 2_according to the patent application scope No. 1 The lighting system in the item, where the polarizing device is composed of alternating high and low index materials. 3. The lighting system according to item 1 of the patent application scope, wherein the polarizing device is composed of a cholesteric liquid crystal layer "4. The lighting system according to item 1 of the patent application scope, wherein the polarized light is converted into the second polarization state and The light not transmitted by the polarizing device will be polarized by the polarizing conversion device again, thereby the light polarized into the first polarization state is transmitted by the polarizing device. 5. A variety of lighting system components include: (a)-light transmission device with a light receiving device; (b)-microprism array, where each microlens contains: (i) an optical connection to the aforementioned light transmission The input surface of the device to receive part of the light passing through the light transmission device; (ii) a side wall bounded by the light input surface and located at an appropriate position to cause complete light received by the light input surface Internal reflection; -19- This paper uses the Chinese National Standard (CNS) A4 specification (210X297mm) --MH-¥ ------- installed-- (Please read the notes on the back before filling in (This page) Scope of patent application A8 B8 C8 D8 Printed and printed by the Belgian Consumer Cooperative of the Ministry of Public Security, Ministry of Economy and Economics (c) The polarizing device 'is located between the optical transmission device and the microlens array, and the polarizing device transmits polarized light The light is converted into the first polarization state and the reflected polarization is converted into the second polarization state. 6. The lighting system according to item 12 of the patent application scope, which further includes a microlens array β optically combined with the microlens array 7. A variety of lighting system components include: (a)-optical transmission device ; (B) — micro-lens arrays, each of which includes: (i) an optical input surface optically connected to the optical transmission device to receive part of the light passing through the optical transmission device; (ii ) A light output surface with a surface area greater than the light input surface; (iii) The first pair of side walls are disposed between and in contact with the input surface and the output surface, and the side wall has at least one in an appropriate position to cause the light input surface Total internal reflection of part of the received light; (iv) The second pair of side walls are arranged between the light input surface and the output surface and are in contact with each other, and at least one of the side walls is at an unreasonable position to cause the light input surface Total internal reflection of part of the received light; and (O polarizing device, located between the light transmitting device and the micro-array, wherein the polarizing device transmits light polarized into the first polarization state and reflects polarized light into the second Polarized state Light; by this, the light is transmitted through the polarizing device and enters the microlens through the light input surface, and then redirects the direction through the side wall and is transmitted by the light output device to become straight polarized light in the space. Use the Chinese National Standard (CNS) A4 specification (210X 297mm) (please read the notes on the back and then fill in this page h. Install. Threading