TWI231874B - Liquid crystal display having high brightness and wide viewing angle - Google Patents

Abstract

A liquid crystal display having high brightness and wide viewing angle is provided, wherein a cholesteric color filter, a collimator, and a diffuser are integrated to achieve the effects of low color shift, high brightness, and wide viewing angle. The display consists of a first substrate, a second substrate, a liquid layer sandwiched between the inner surfaces of the first and second substrate, a cholesteric color filter disposed in the inner surface of the first substrate, a collimator disposed on the outer side of the first substrate, a diffuser disposed on the outer side of the second substrate. In accordance with the invention, the traditional absorbing filter is substituted with a cholesteric color filter to improve the light utilization efficiency, reduce the power consumption, and save the material cost. In addition, one collimator and a diffuser are provided to solve the problem of color shift and further to increase the brightness, thereby enhancing the wide viewing angle.

Description

1231874 V. Description of the invention (1) [Field of the invention] The present invention relates to% LCD), and more specifically, to liquid crystal displays (L i qu id Cry sta 1 D i sp 1 ay) Viewing angle (Wide VieWing angle), :: Alcohol, chromic light sheet, a collimator and a diffuser to achieve the effect of low color, two degrees of immunity, and wide viewing angle. [Other technologies] The figure is not a proactive initiative Type thin film transistor display (i CD), which is composed of a liquid crystal display panel 1000 and a backlight module, and the LCD panel includes a pair of first glass-made panels. A transparent substrate 3a, 3b, and a liquid crystal layer 4 sandwiched between the transparent substrate 3a and the upper surface of the first transparent substrate 3a have a plurality of pixel electrodes 5 formed of ITO; each pixel electrode 5 passes through a drain electrode. (〇 ^ 3 丨 11) is connected with a thin film transistor 6 (thln film transistor, TFT) to form an electrical switch, and a liquid crystal alignment film isuiignmenlfll

f 1 lm) is coated on the day transparent electrode 5 and the thin film transistor 6 on the first transparent substrate, and the spacers are uniformly sprayed on the liquid crystal alignment film 13 to maintain the fixation between the two transparent substrates 3 a and 3 b. Interval; the lower surface of the other transparent substrate 3 has a color filter layer 7 composed of red (R) sub-pixels 8, green (G) sub-pixels 9, and blue (B) sub-pixels 10, Each pixel is separated by a black matrix 7a (black matrix; BM) and corresponds to each pixel electrode 5 to form a color pixel. A flat layer 11 (1) 1 & 1 ^ 1 ^ 23 ^ 〇11 {11111) Set on the color filter layer 7, a common electrode 12 is formed on the flat layer 11 and is opposite to the day electrode 5 to form a potential difference to drive the middle liquid crystal layer

P0M80.ptd Page 4 1231874 V. Description of the invention (2) 4. For twisted-wire (TN type) liquid crystal displays, the alignment of the liquid crystal alignment films 13 and 14 is 90 °, so the liquid crystal molecules 4a are anchored by the alignment. The effect of the anchoring force will also rotate 90. . In addition, a pair of polarizing plates 15 and 16 are respectively pasted on the outer surfaces of the second and first transparent substrates, and the absorption axis directions of the two polarizers are perpendicular to each other, and the orientation directions of the alignment films 3, 14 are parallel, respectively. . The backlight module 10i is located outside the first transparent substrate 3b of the liquid crystal panel. The backlight module 101 includes a light source 7, a light guide plate 18, and a reflective plate 19. The color filter layer is generally known to achieve a color development effect by absorbing a certain range of wavelengths, and its manufacturing methods include a dyeing method, a pigment dispersion method, a printing method, and an electronic writing method. The correct color rendering effect is achieved by properly selecting dye molecules to absorb specific wavelengths. The manufacturing method is detailed in the book "LiqUid crystal display technology 〇f the next generation" by τ · Uchi da. " Ρ · 115-126. In addition, a color filter layer made of an inorganic substance ^^ allows the selected wavelength to pass through and reflects the remaining wavelengths. This color filter layer combines light and is suitable for projection systems that require light stability. .

The disadvantage of the above-mentioned conventional liquid crystal display is that the transmittance is too low, only about 4 to 6% of the original emitted light. The general transmittance can be expressed by the following formula:

Transmittance = AxBxCxD where A · represents the aperture ratio of the TFT array (〇perl ratio) B: represents the transmittance of the liquid crystal layer represents the transmittance of the upper and lower polarizers represents the transmittance of the color filter layer

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Typical values of D are shown in Table 1. Table 1-60 ~ 70% ^ Β 90 ~ 95% 40% D 30% In order to solve the aforementioned shortcomings, someone in the prior art has proposed to use a reflective or "light-reducing sheet to replace the conventional absorption-type color filter Film, the degree of the southern shell of the yeast: refer to Figure 2, which shows one of the prior art cholesterol phase color filter system 2000. · A cholesterol phase color filter 22 contains three primary color sub-pixels, that is, red sub-pixel 22a The green sub-pixel 22b and the blue sub-pixel 22c are generally formed by thermo-induced cholesterol-phase liquid crystal or polymer. The temperature can be used to adjust the heHx pitch of the cholesterol polymer appropriately. The wavelength 'reflects the rest of the wavelength without absorbing the energy of the incident light. A broadband polarizer (broad-band polarizer; BBP) 21. It also provides circular polarization between the side light plate and the color filter 22. The light is also absorbed by the liquid crystal or polymer with a cholesterol phase = round = As can be seen from the above table, it is absorbed by the backlight and polarizing plate. Only 4 ~ 60 / 〇 light utilization not only limits the display but also causes Heavy burden. Therefore, the degree of LCD Most of the emitted light can reach the viewer's eyes through the color filter. Such a low action and outdoor application and the need for the power supply to develop a low power consumption and highlight 1231874 V. Description of the invention (4) Four shots and the same Handness light, and quarter wavelength plate (λ / 4) plate 23 passing through the remaining light is provided on the color filter 22 for converting circularly polarized light 26 into linearly polarized light 27.

The backlight module 1 01 emits white unpolarized light 24. After passing through a right-handed broadband polarizer (RH-BBP) 21, it becomes white left-handed circularly polarized light (not shown in the figure), and its right-handed component is reflected by RH-BBP. Back to the backlight module 101, after the white left-side circularly polarized light passes through the left human cholesterol 22a of the left-handed cholesterol phase color filter 22, the red component 26a penetrates, and the cyan 25a (cyan) component is reflected back to the backlight In module 101, similarly, when the white left-handed circularly polarized light passes through the blue subdiurnal 22c, the blue left-handed circularly polarized light 26c penetrates, the yellow left-handed circularly polarized light 25c reflects, and the same is true for the green sub-pixel. At this time, the red, green, and blue left-handed circularly polarized lights 26a, 26b, and 26c pass through an A / 4 plate 23 and become red, green, and blue linearly polarized lights 27a, 27b, and 27c, completing the color filter effect.

As shown in FIG. 3, a cross-sectional view of the Twisted Filamentary Liquid Crystal Display (TN-LCD) 1 is applied to this cholesterol phase color filter system 200. When the thin-film electric crystal switch 6a is turned off, the liquid crystal molecules 4 are not affected by the electric field, but are twisted by 90 only by the anchoring force of the alignment films 13,14. As in the state of 4a, the red, green, and blue linearly polarized light passing through the color filter system 200 at this time also follows the liquid crystal layer "Square 90" and passes through the polarizing plate 15 to appear bright (nomaHy white). When When the transistor switch 6b is turned on, the liquid crystal molecules stand vertically above and below the substrate (that is, aligned in a parallel electric field direction) under the action of the electric field, as shown in FIG. When

1231874 V. Description of the invention (5) The same direction passes through a uniform medium, the polarization direction does not change, so it is blocked by the linear polarizer 15 and presents a dark state (black).

This color filter system 200, because the incident light is semi-penetrated and semi-reflected, the light is not absorbed and the utilization of light is greatly improved. As shown in FIG. 2, this system does not absorb light. The reflected light of the BBP 21 and the reflected light 25a, 25b, and 25c of the cholesterol phase color filter layer 22 pass through the reflection plate 19 in the backlight module 101. , Reflected back to the display system for reuse. According to a paper published by A. Hochbaum et. Al. In SI D1 99, entitled "Cholesteric color filter: Optics Characteristic, Light Recycling, and Brightness Enhancement) 1 'revealed that under the condition that the aperture ratio of the thin film transistor is maintained at 73%, the light transmittance of the system is more than 8 times higher than that of the conventional absorption type color filter. Therefore, replacing the conventional absorption type color filter with a cholesterol phase color filter can not only reduce costs, reduce power consumption, but also greatly increase brightness. _

The above display system using a cholesterol phase color filter has the advantages of brightness, but its disadvantage is that the color of the image will change with the angle of the viewer ', that is, when the viewer is not looking straight (the line of sight is perpendicular to the LCD panel) and tilted. When viewed at an angle, due to the characteristics of the cholesterol-phase color filter, the developing color will be shorter than the wavelength of the front view, which is called color shift (co 〇 〇r sh ift). This disadvantage is used in many display applications. Is not acceptable. In view of this, there is a need to provide a liquid crystal display device capable of solving color shift, providing higher brightness and a wider viewing angle. [Summary of Invention]

P01-180.ptd

1231874 V. Description of the invention (6) Therefore, in view of the above disadvantages, the main object of the present invention is to provide a liquid crystal display device for solving color shift and improving brightness. Another object of the present invention is to provide a liquid crystal display device capable of providing a large viewing angle for a vehicle driver. Still another object of the present invention is to provide a liquid crystal display device, which has the advantages of low transmittance, reduced material cost, and increased recycling rate of light, so as to reduce power consumption of the backlight. To achieve the above object, the present invention provides a high-brightness and wide-viewing-angle liquid crystal display device, which is characterized by combining a cholesterol phase color filter, a collimator, and a diffuser to solve color shift, reduce manufacturing costs, and achieve high The effect of brightness and wide viewing angle. a = According to a preferred embodiment of the present invention, the high-brightness and wide-viewing angle liquid crystal display 3rd transparent substrate and a second transparent substrate; a twisted filamentary liquid crystal layer is sandwiched between the first and second transparent substrates; The first transparent upper surface has a cholesterol phase color filter. The color filter is composed of a bile solid phase and a color filter. The reflected light of the two-color layer is the cholesterol phase color filter. Complementary colors of each daylight; and a quarter-wave plate is pasted on the upper surface of the cholesterol phase color filter, and the lower surface of the second transparent substrate has a plurality of thin film transistors and daylight electrodes; The f polarizer is attached to the upper surface of the second transparent substrate; one is on the linear polarizer; and the backlight module is disposed on the lower side of the collimator. 2 ί Another view of the invention 'f Hai high-brightness wide-viewing-angle liquid crystal display can be vertical alignment type (va), super twist type (_), electronically controlled double refraction (ECB), or strong induction type (ferroelectric ) Liquid P01-180.ptd

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V. Description of Invention (7)

The high-brightness and wide-viewing angle liquid crystal display device of the present invention uses a combination of a sterol phase color filter, a collimator, and a diffuser to solve the color shift problem of the first cholesterol phase color filter, and Its brightness is higher than that of a conventional 2 cholesterol phase color filter LCD display. With this junction 2, the display device can replace the conventional absorption type color filter, reduce the cost of I, and has a wide viewing angle and low power consumption. Advantages of electricity. -In order to make the above and other objects, features, and advantages of the present invention more obvious, the following describes the preferred embodiments of the present invention in detail with reference to the accompanying drawings.

[Explanation of the invention] * Please refer to FIG. 4 to disclose the first preferred embodiment of the present invention with a wide viewing angle and high degree liquid crystal display 400. The liquid crystal display 400 generally includes a liquid crystal display unit 300, a collimator 41 on a lower surface of the liquid crystal display unit 300, a diffuser plate 43 on a upper surface of the liquid crystal display unit 300, and A backlight module 101 is located below the collimator 41. team

The liquid crystal display unit 300 mainly includes first and second transparent groups_1 3 a, 3 b ′, and a twisted filament-like liquid crystal layer 4 is sandwiched between the inner surfaces of the first transparent substrate 3 a and the second transparent substrate 3 b. between. A cholesterol phase color filter 22 is disposed on the upper surface of the first transparent substrate 3a. The cholesterol phase color filter 22 has a plurality of red, green, and blue color sub-pixels 22a, 22b, and 22c. The pixels are separated by a black matrix (BM), wherein the sub-day element 'Example 22a' is composed of two cholesterol phase color filter layers 22a, 22a, and 'composed' of the two color filter layers 22a ,, 22a, 'The reflected color is the complementary color of the subdiurnal 22a. A / 4 (quarter wavelength) plate 2 3 is set in the

P01-180.ptd Page 10 1231874 V. Description of the invention (8) The upper surface of the cholesterol phase color filter 22 is used to convert circularly polarized light into linearly polarized light. A transparent electrode layer 12 is provided on the i / 4 plate 23 as a common electrode. A plurality of thin film transistors 6 are provided on the lower surface / surface of the second transparent substrate 3b as electrical switches, and the plurality of pixel electrodes 52 and the pixels 22a, 22b, 22c of the color filter are opposed to each other. The two liquid crystal alignment layers 13 and 14 are coated on the inner sides of the first and second substrates 用 and 3b, and the upper and lower liquid crystals are twisted by 90 with the alignment liquid crystal B. . A linear polarizing plate 15 is disposed on the upper surface of the second transparent substrate 3b, and the absorption axis of the polarizing plate is parallel to the rubbing direction of the alignment layer µ. The collimator 41 is bonded to the lower surface of the liquid crystal display unit 300. Generally, the collimator 41 is composed of arrayed microlenses or Fresnei lenses, and is used to transform scattered light into parallel light. And has the function of focusing light. The light diffusing plate 43 is bonded to the upper surface of the liquid crystal display unit 3000. The light diffusing plate 43 is a rough surface or a substrate embedded with scattering particles, and is used to scatter light to expand the viewing angle. A backlight module 丨 〇 J is disposed below the quasi-wide T device 41. 'The cholesterol phase color filter 22 is basically composed of chiral nematic LC, cholesterol phase liquid crystal, or cholesterol phase polymer. It uses the adjustment of the spiral period of the cholesterol phase substance to reflect various wavelengths of light and polarized light in a specific rotation direction (left-circularly polarized light or right-circularly polarized light). Therefore, the LCD 400 may also have a broad-band polarizer (BBP) disposed between the backlight module 101 and the color filter 22 to provide polarized light with a specific rotation direction. Thereby, the color purity of the light emitted from the liquid crystal display 400 is increased. But better at this

P01-180.ptd Page 11 1231874 Explanation of the invention (9) The artist will understand that the BBP film can also be omitted. The cholesterol phase color filter 2 2 'used in the present invention is composed of a two-layer thermotropic cholesterol phase polymer', and its detailed manufacturing method is detailed in US Patent No. 5,734,457, which is incorporated herein by reference as reference. The manufacturing process of the color filter 22 is as follows: First, a cholesterol polymer is placed at a temperature to make its spiral period reflect the green light, and then it is blocked by a photomask, and the polymer monomer is hardened with UV light to make it The spiral period is fixed and does not change with temperature. At this point, 22a 'is completed, and the temperature is adjusted to reflect the blue light, and then hardened.

The fixed spiral period is obtained to obtain 2 2b, and then the temperature is adjusted to reflect red light, and the fixed spiral period is obtained to obtain 22c. In the same way, a second color filter layer 22a ", 22b", 22c "can be made, which reflects blue light, red light, and green light, respectively. At this time, the red subdiurnal element 22a of the cholesterol phase color filter is made of green light. The reflection layer 2 2 a and the blue light reflection layer 2 2 a are composed of a green sub-pixel 2 2b composed of a blue light reflection layer 22b ′ and a red light reflection layer 22b. Similarly, the blue sub-pixel 22c is composed of The red light reflection layer 22c, and the green light reflection layer 22c, are composed.

Please refer to FIG. 4 'for explaining the display principle of the high-brightness and wide-viewing angle display device of the present invention. The backlight module 101 emits white unpolarized light, and after passing through the collimating lens 41, it becomes unpolarized parallel light and is focused on each of the color pixels 22a, 22b, and 22c. After the white non-polarized light enters the red hypothermia 22a of a cholesterol phase color filter 22, it first reflects green light through a green reflective layer 22a ', and then reflects blue light through a blue reflective layer 22a, 1. Finally, Only red circularly polarized light passes through the same way as white unpolarized light passes through the green and blue sub-pixels 22b and 22c to obtain green and blue circularly polarized light.

1231874 V. Description of the invention (10) The red, green, and blue circularly polarized light passes through a λ / 4 plate 23 and becomes red, green, and blue linearly polarized light. If the thin film transistor 6 is turned off, the liquid crystal layer 4 is only twisted up and down 90 by the anchoring force of the alignment layers 13 and 14 at this time. In the state of 4a, the polarization direction of the linearly polarized light is twisted by 90 with the liquid crystal layer 4a. , And through the deflection plate 1 5, showing a bright state. The emitted red, green, and blue linearly polarized parallel light passes through a diffuser plate 4 3 and is scattered uniformly in all directions, thereby expanding the viewing angle range to reach the observer's eyes. When the thin film transistor 6 is turned on, there is an electric field between the day element electrode 5 and the common electrode 12. At this time, the liquid crystal layer 4 is affected by the electric field and the vertical base plates 3a, 3b stand, as in the state 4b, pass; I / 4 plate 23 After 4b of linearly polarized light, its polarization direction does not change, so it is blocked by the polarizer 5 and appears dark.

The light reflected by the cholesterol phase color filter and the light sheet 22, that is, the cyan light (including blue light and green light) reflected by the red subdioxin 22a, and the magenta light (including red light and Blue light), and the yellow light (including red and green light) reflected by the blue subdiurnal element 22c, will be reflected back to the backlight module 1 〇 ^^ through the reflection plate 19, and reflected back to the liquid crystal display unit 3 〇〇 中. Because the alcohol-phase color filter does not absorb light, all the light emitted from the backlight can pass through the color filter 22 to the observer's eyes, so not only the brightness is increased, but the power consumption of the backlight module is reduced. the amount. Please refer to FIG. 5 ′, which shows a wide viewing angle high-brightness liquid crystal display 500 according to another preferred embodiment of the present invention. The structure is similar to the wide viewing angle high-brightness liquid crystal display 400 shown in FIG. 4. Wherein similar elements are marked with similar numbers. The liquid crystal layer 51 between the inner surfaces of the upper and lower substrates 3 a and 3 b of the liquid crystal display 500 is not limited to a twisted filament liquid crystal, and may be vertical

Page 13 1231874 Description of the invention (11) Liquid crystals such as alignment type (VA), super twist type (STN), ferroelectric, and electronically controlled birefringence (ECB). In addition, the liquid crystal display device 500 does not have the same; the 1/4 plate 23, and the day element electrode 52 is a day element electrode of a matrix-separated array arrangement type. In the liquid crystal display 500, the red, green, and blue circularly polarized light passing through the cholesterol-phase color filter 22 is passed through the liquid crystal layer 51, and the voltage is sensed under the condition of voltage application and no voltage application. The optical path difference (optical length difference) is different, so the polarization direction is also different. At this time, the light intensity after passing through the polarizing plate 5 will also be different. Then, the light is scattered uniformly in all directions by the diffuser plate 4 3 and reaches the observer. The title 'in this way shows a variety of different light and dark gray levels. Similarly, the reflected light after passing through the cholesterol-phase color filter 22 is shot back through the reflection plate 19 f of the backlight module, and it is returned to the liquid crystal display unit 300 to be fully used to improve the whole. LCD brightness of 500. α According to the wide-viewing-angle high-brightness liquid crystal display device of the present invention, a collimator is used to direct light to the liquid crystal panel, thereby solving the problem of color shift caused by the cholesterol phase color filter when the light is incident obliquely. The micro lenses or Fresne lenses arranged in the array can focus the light source to the densities and increase the light transmittance without being affected by the aperture ratio of the pixel electrodes. Furthermore, the wide viewing angle high-brightness liquid crystal display device according to the present invention utilizes a diffuser plate to expand the viewing angle, so as to solve the above-mentioned problem of viewing angle when using a collimator. The wide-viewing-angle high-brightness liquid crystal display device according to the present invention uses a cholesterol-phase color filter of a semi-reflective non-light-absorptive element, instead of the traditional absorption-type color filter, which can not only improve brightness, increase light utilization rate, but also reduce Material costs.

1231874 V. Description of the invention (12) Although the present invention has been disclosed in the aforementioned preferred embodiment, it is not the present invention. Any person skilled in this art can make various changes and modifications within the scope of the people: month The spirit and scope of the application shall be determined by the scope of the attached patent application. The protection scope of the invention POM80.ptd Page 15 1231874 Brief description of the drawings [Illustration] Figure 1: A schematic cross-sectional view of a conventional thin film transistor display. FIG. 2 is a schematic cross-sectional view of a conventional cholesterol phase color filter. Fig. 3: Schematic cross-sectional view of a liquid crystal display with cholesterol-based color light film. FIG. 4 is a schematic cross-sectional view of a wide viewing angle high-brightness liquid crystal display according to a first preferred embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of a wide viewing angle high-brightness liquid crystal display according to a second preferred embodiment of the present invention.

Description of drawing number 1 Twisted thin film transistor liquid crystal display 3a upper substrate 3b lower substrate 4 liquid crystal layer 4a liquid crystal state without voltage 4b liquid crystal state with voltage 5 day electrode 6 thin film transistor 6a thin film transistor 6b thin film transistor Crystal 7 Color filter 7a Black matrix 8 Red subpixel 9 Green subdivision 10 Blue subpixel 11 Flat layer 12 Common electrode 13 Alignment film 14 Alignment film 15 Polarizer 16 Polarizer 17 Cold cathode fluorescent tube 18 Light guide plate 19 Reflective plate 21 Right-handed broadband polarizer

Spider, Jun I

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22 Cholesterol phase color filter 22a Cholesterol phase Red subdioxin 2 2b Cholesterol phase Green subdioxin 2c Cholesterol phase Blue hypochrysin 2 2a 'Green light reflection layer 22b' Blue light reflection layer 22c 'Red light reflection layer 23 λ / 4 plate 25 left-handed circularly polarized reflected light 25b left-handed magenta reflected light 26 left-handed circularly polarized output light 26b left-handed magenta outgoing light 27 linearly polarized light 2 7b green linearly polarized light 41 collimator 52 pixel electrode 100 thin film electrical Crystal liquid crystal display 22aπ blue light reflection layer 22b "red light reflection layer 22cn green light reflection layer 2 4 white non-polarized light 2 5a left-handed cyan reflected light 25c left-handed yellow reflected light 26a left-handed turquoise outgoing light 26c left-handed yellow outgoing light 27a red linear Polarized light 2 7 c blue linearly polarized light 43 diffuser 53 liquid crystal layer

IWW · I body pride: 1 0 1 backlight module 2 0 0 cholesterol phase color filter system 3 0 0 liquid crystal display with cholesterol phase color filter 400 wide viewing angle high brightness liquid crystal display 5 0 0 wide viewing angle high brightness liquid crystal display

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Claims (1)

1231874 Scope of patent application A wide viewing angle, high-brightness liquid crystal display device includes a first transparent substrate defining an outer surface and an inner surface, and the following: a second transparent substrate, # 定 一 外面 和 内 内 面 ， The inner surface is opposite to and separated from the inner surface of the first transparent substrate; a cholesterol-phase color filter having a plurality of color sub-days is disposed on the inner surface of the first substrate; and a mouth-liquid crystal layer is sandwiched between the first surface Between a transparent substrate and the second transparent substrate; a polarizing plate provided on an outer surface of the second transparent substrate; A diffusing plate is provided on the outer surface of the second transparent substrate; and a collimator is provided on the outer surface of the first transparent substrate. ^ The wide viewing angle high-brightness liquid crystal display device according to item 1 of the scope of the patent application 'additionally has a quarter-wave plate disposed between the cholesterol phase color light-transmitting sheet and the liquid crystal layer. 3. The wide viewing angle high-brightness liquid crystal display panel according to item 1 of the scope of patent application, wherein the second transparent substrate further includes a plurality of pixel electrodes, wherein each pixel of the day electrode and each pixel of the cholesterol-phase color light film are opposite to each other. . 4. The wide viewing angle high-brightness liquid crystal display panel according to item 1 of the scope of patent application, wherein the polarizing plate is a linear polarizing plate. 5, according to the scope of the patent application of the wide viewing angle and high brightness LCD display equipment P01-180.ptd Page 18 1231874 6. The scope of patent application, where the collimator is an array of micro lenses. 6. The wide viewing angle high-brightness liquid crystal display device according to item 1 of the patent application scope, wherein the collimator is a Fresnel lens. 7. The wide viewing angle high-brightness liquid crystal display device according to item 1 of the scope of the patent application, wherein the cholesterol-phase color filter includes two layers of cholesterol-phase color filters, and after the white unpolarized light is incident, it is colored with the cholesterol-phase. A part of the light of the same color of the sub-day light element of the light sheet passes through the sub-day light element, and a part of the light complementary to the color of the sub-pixel is reflected. 8. The wide viewing angle high-brightness liquid crystal display device according to item 1 of the scope of patent application, wherein the material of the liquid crystal layer is a group consisting of vertical alignment type liquid crystal, super twist type liquid crystal, strong induced liquid crystal, and electrically controlled birefringent liquid crystal. Selected in the group. Bu, 1 丨 __1 丨 P01-180.ptd Page 19