TW200815856A - Transflective LC display with internal reflector and reflective polarizer - Google Patents

Abstract

A transflective display having a reflective viewing mode and a transmissive viewing mode is provided. The transflective display includes a liquid crystal (LC) panel having an array of partially reflective pixels. The reflective portions of the array of partially reflective pixels include metal positioned on a viewer side of the LC panel to reflect light back toward the viewer. The display also includes a reflective polarizer, in place of a conventional rear polarizer, positioned behind the LC panel on a side of the LC panel opposite the viewer side. The reflective polarizer is also oriented to reflect ambient light back toward the viewer.

Description

200815856 IX. OBJECTS OF THE INVENTION: 1. Field of the Invention The present invention relates to a display device, and more particularly to such an operator using a liquid crystal (Lc) panel and light that can reflect ambient light and transmit light originating from a backlight. , and related items and procedures. [Prior Art] Microprocessor-based devices including electronic displays for transmitting information to viewers have become almost ubiquitous. Mobile phones, handheld computers, personal digital assistants (PDAs), video games, MP3 players and other portable music players, car stereos and indicators, public displays, automated teller machines, information stations in stores, household appliances, computers Monitors and televisions are examples of such devices. Many of the displays provided on such devices are liquid crystal displays (LCD or LC displays). Unlike cathode ray tube (CRT) displays, liquid crystal displays do not have a luminescent phosphor image screen and therefore require a separate source for viewing images formed on such displays. For example, a light source can be located behind a display, which is commonly referred to as "backlight". The backlight is located on the opposite side of the liquid crystal display from the viewer so that light generated by the backlight passes through the liquid crystal display to reach the viewer. A liquid crystal display using such a backlight can be said to operate in a 'transmission' mode. An alternative source of illumination can come from an external source such as ambient room light or the sun. Some liquid crystal displays are designed to operate in either mode of the two modes, the above-described transmission mode using backlights, or a "reflection" mode, which is reflected from an external light source located on the viewer side of the liquid crystal display. 123391.doc 200815856 These liquid crystal displays (referred to as ''transflective> displays) generally have a liquid crystal panel and a partially reflective layer between the liquid crystal panel and the backlight. In other cases, a partially reflective layer Placed in the liquid crystal panel rather than between the liquid crystal panel and the backlight. In either case, the partially reflective layer (herein referred to as a transflective) transmits sufficient light from one of the backlights, Reflecting a sufficient portion of the external light to allow the display to be viewed in both transmissive mode and reflective mode. An exemplary transflector is a VikuitiTM transflective display film available from 3M Company (,, TDF") The film comprises a reflective polarizer formed by polymerizing a multilayer optical film (ie, reflecting a polarized light and transmitting a crossed polarized light) The TDF product also includes a diffusion bonding layer and a neutral density coating. The liquid crystal panel assembly of the liquid crystal display generally comprises two substrates and a liquid crystal material placed therebetween. The substrate may be glass, plastic, or Other suitable transparent materials are produced. The substrates are supplied with an array of electrodes that provide electrical signals to a corresponding array of individual regions known as image elements (pixels) that together define the viewing area of the display and individually Defining the resolution of the display. The electrical signals provided by the electrodes, typically in combination with thin film transistors (TFTs), allow adjustment of the optical components of each pixel, such as significantly modifying the polarized state of the transmitted light, or allowing light to pass through. The polarization state is not significantly modified. In some cases, the electrical signal can switch the liquid crystal from a transmissive state to a scattering state, or provide some other optical change in the pixel. The liquid crystal panel typically does not include a height between the substrates. An absorptive color filter. However, it may include a cross-visible absorption of less than 50% of the incident light. Weak filter color. 123391.doc 200815856 In the LCD panel... the material can be nematic, such as twist (10), optically compensated f (0CB), electrically controlled birefringence (ecb), twisted nematic (then), or Bistable nematic liquid crystal or other known nematic mode. It can also be a matrix liquid crystal for ferroelectric, antiferroelectric, subferroelectric and other matrix modes. It is a cholesteric liquid crystal, a liquid crystal/polymer composite, a polymer dispersed liquid crystal, or any other type of liquid crystal configuration that can be electrically switched between at least two optically distinguishable states.

Generally, the liquid crystal display is monochrome or colored. In a monochrome display, each pixel in the viewport can be dark, bright, or intermediate intensity level, such as in a grayscale image. This intensity modulation is typically used in white light (to produce white, black or gray pixels), but other colors such as green, orange, etc., can be used. However, this intensity modulation does not produce a range of colors at any arbitrary location in the viewing area. Conversely, a "full color" liquid crystal display can produce a perceptible color range, such as red, green, or blue, at any arbitrary location within the viewing area. Conventional transflective systems are typically designed to reflect brightness, A compromise between transmission brightness and color generation. Typically, a half transflective layer (between the transparent substrate of the liquid crystal panel or between the liquid crystal panel and the backlight) will reflect a portion of the incident light to provide external reflection in the reflective mode. The illumination of the source, and will transmit a different portion of the incident light to provide illumination from the backlight in transmissive mode. The design of the transflector can be tuned to make the transmissive or reflective mode brighter, often with the other In particular, the present disclosure discloses a transflective display having a reflective viewing mode and a transmissive viewing mode. The display includes a liquid crystal (LC) panel in front of the reflective polarizer. A reflective polarizer replaces a conventional post polarizer that is used with a front polarizer to control transmission or counter Absorption/transmission of light. The liquid crystal panel includes a partially reflective pixel having a reflective portion and a transmissive portion. The reflective portion includes a metal layer on the viewer side of the liquid crystal panel for reflecting the %2 light back to the viewer. The polarizer is located behind at least the transmissive portion of the pixel to also reflect ambient light back to the viewer. The partially reflective pixel and the reflective polarizer together provide excellent brightness from a very high percentage of the display area in the reflective mode. These and other aspects of the present application will be understood. However, the above summary should in no way be considered as limiting the claimed subject matter, which is defined only by the scope of the accompanying claims, as may be modified during the application. Embodiments As described above, a "transflective" liquid crystal (LC) display is any intuitive liquid crystal display that can be used in both ambient mode and backlight mode. The disclosed transflective liquid crystal display uses an inner reflective layer. And the configuration of the outer transflective layer to provide a very high reflectance in the reflective mode, but in transmission The mode still has very high brightness. The two reflection modes from the internal reflector and the outer transflector work together to provide excellent brightness from a very high percentage of the display area. Figure 1 shows a transflective liquid crystal display 10 A portion of the schematic 123391.doc 200815856 side view includes a front polarizer 12, a liquid crystal panel 14, a reflective polarizer 16 that replaces a conventional rear polarizer, and a backlight 18. The controller 20 is connected via a connection 22 is electrically coupled to the liquid crystal panel 14 to control the optical state of the individual pixels 24a through 24g of the liquid crystal panel, the pixels extending over a repeating pattern or array over an area defining the overall viewing area of the display. The device 26 is electrically coupled to the backlight 18 via a connection 28 to control its operation in some but not all of the liquid crystal displays. In addition, some monitors

The other connection 29 between the controllers 20, 26 allows for simultaneous operation of the liquid crystal panel and backlight. The front polarizer 12 can be any known polarizer, but in an exemplary embodiment, it is an absorptive polarizer (sometimes referred to as a two-way) for easy viewing and reducing glare to an observer. Color polarizer). The polarizer 12 is a flexible polymer based film and is laminated or bonded to the liquid crystal panel 14, for example, using an optically clear adhesive. If the polarizer 12 is a linear polarizer, it has a pass axis and a blocking axis in the plane of the film or layer. The light that is polarized by the flat light is transmitted through the light that is polarized by the axis, and the light that is polarized parallel to the blocking axis (perpendicular to the passing axis) is blocked, for example, by the front polarizer 12. The liquid crystal panel 14 includes a liquid crystal material sealed between two transparent substrates, and an electrode array of corresponding arrays of boundary pixels 24a to 24g. A controller can individually address or control each pixel to form the desired image. The polarization of the light of the liquid crystal panel is rotated according to whether the given pixel is turned on or off, or in the intermediate state. Similarly, the liquid crystal panel can change the light polarization state from linear to elliptical or _, and vice versa. The liquid crystal panel can have its front side attached to the front polarizer, and can also include a diffuser film, an anti-reflection 123391.doc 200815856 gland' an anti-glare surface or other front surface treatment. 2 illustrates a more specific display 200, which is a specific embodiment of display 10 shown in FIG. Referring now to Figures 1 and 2, the pixel array within liquid crystal panel 14 is an array of partially reflective pixels (pRp). For example, the partially reflective pixels of Figures 5 through 5 can be configured to include a viewer side of the liquid crystal panel using internal reflection layer 212 (not shown in Figure 1) (i.e., observer 11

Metal on the side). The inner reflective layer 212 can be a reflective layer of aluminum, silver indium or any other metal that provides broadband reflection, and from the observer! ! The direction of the coverage covers a certain percentage of the pixel area. In an exemplary display, the reflective portion 220 of each pixel 24 having the inner (inside the liquid crystal panel 14) reflective layer 212 in front of the opaque pixel portion 210 comprises between about 15% and 75% of the total pixels, while the transmissive portion 222 of the pixel is substantially The upper part of the pixel area is included. In a specific embodiment, the reflective portion 22 is covered with other black areas to cover the area of the TFT, the storage capacitor, or the pixel edge region. The thickness of the liquid crystal layer that positions the inner reflector 212 (e.g., the thickness of the liquid crystal material between the substrates 206 and 208 shown in Figure 2) is typically thinner (possibly half the thickness) of the transmissive region 222 of the pixel. Display 10 can be a monochrome display or a color display. For color, the display can use field sequential color techniques, diffractive color separation, enamel patches, or a combination of such effects for color generation. The color filter 224 (if any) shown in Figure 2 can be located only above the transmissive portion of each pixel. _And, in the potted configuration, 遽, color patches can cover the entire pixel area. For illustrative purposes: Filters are omitted from other drawings. For example, it includes direct illumination Moonlight 18 can be any of a variety of different backlight types. 123391.doc 200815856 Bright or edge illuminated backlight design. The backlight 18 can use a fluorescent bulb, a light emitting diode (LED), or a luminescent light emitting technique. For some displays, the backlight (10) is in a field sequential color backlight under the control of the controller 28. In these displays, the color filter 224 is generally not required. In other displays, the backlight can be a dimming backlight, in which case it is common, but not necessary, to use a color filter. Although only shown schematically, backlight 18 typically also includes conventional components such as light guides, light enhancement films, lenses, and other components to provide substantially uniform and efficient illumination over the viewing area of the display. The reflective polarizer 16 is an external transflector because it is located outside and behind the liquid crystal panel 14 and its partially reflective inner layer 212, typically between the liquid crystal panel 14 and the backlight 18. In an exemplary embodiment, the reflective polarizer 16 covers the entire area of the pixel 'specifically, covering the transmissive area 222 of the pixel. Reflective polarizer 16 can be a linear reflective polarizer such as this VikuitiTM RDF-C or TDF film (3M & São Paulo, Minnesota). Another type of reflective polarizer that can be used is the DRPF polarizer described in U.S. Patent No. 6, U. For example, the reflective polarizer 16 can also be a line grid reflective polarizer or a cholesterol reflective polarizer. The reflective polarizer 16 may, but need not be, US Pat. No. 5,882,774 (Jonza et al.) or U.S. Patent Application Publication No. 2002/0190406 (Merrill et al.), 2002/0180107 (Jackson et al.), 2004/ Polymer multilayer design of No. 0099992 (Merrill et al.) and 2004/0099993 (Jackson et al.). Therefore, the polarizer 16 has a passing axis and a blocking axis in the plane of the polarizer, wherein the light that is polarized parallel to the passing axis is substantially transmitted, and the light that is polarized parallel to the blocking axis is substantially polarized. reflection. The absorption in the polarizer 16 is usually negligible, especially at the visible wavelength. The pass axis of the back polarizer 16 can have any desired orientation relative to the pass axis of the front polarizer 12, but for purposes of this description, the pass axis of the back polarizer 丨6 and the pass axis of the front polarizer 12 will be assumed. vertical. In this case, the display 1 is an inverted type of transflector because the pixel 24 (whose state (determined by the controller 20) makes it bright in the reflective view mode) causes it to be in the transmissive view mode. Dark; and pixel 24 (whose state is dark in the reflective view mode) will make it bright in the transmissive view mode. In this aspect, transflective displays generally operate in two categories: reverse and non-reverse. The non-inverting display provides the same image in both the reflective and transmissive modes of operation, as in either case, any of the pupil transflective exiting the display travels to the back polarizer (which defines the polarization of the light), through the liquid crystal The panel exits through the front polarizer. The external light incident on the display passes through the front polarizer, through the liquid crystal panel, through the back polarizer, from the transflective reflector, back through the back polarizer and the liquid crystal panel, and exits through the front polarizer. The light from the backlight passes through the semi-transmissive semi-reflection, passes through the back polarizer, passes through the liquid crystal panel, and exits through the front polarized light. Because the two modes of operation provide similar images (although the reflective mode is monochromatic and the backlit image can be colored), then the self-reflecting and transmissive stalk-off light from the system will operate to provide a brighter overall image. As described above, the reflective polarizer 16 is used as a back polarizer for a liquid crystal display such as a reflective polarizer, which may be a sheet (3M Company, St. Paul, Alaska, USA), which is laminated to replace the display 123391, doc-13. A known absorbent back polarizer in 200815856. The RDF-C film comprises a polymeric multilayer reflective polarizer and a light diffusing adhesive layer. In this case, external light incident on the display passes through the front polarizer, then passes through the liquid crystal panel, and strikes the reflective polarizer. At this time, a polarized state (state " is reflected and returned through the liquid crystal panel and the front polarizer. However, the light of a quadrature polarization state (state, 2,,) is transmitted by the reflective polarizer and absorbed. Or in the vicinity of the backlight loss. For the light originating from the backlight, the polarized state 2 is transmitted through the reflective polarizer, through the liquid crystal panel, and through the front polarizer, while the polarized state 1 is reflected back into the backlight and is lost. The reflective mode of operation introduces the polarized state 1 into the liquid crystal panel, and the transmissive mode of operation introduces the polarized state 2 into the liquid crystal panel, and the two images are thus reversed. Thus, the transmissive mode image appears to be a photo-negative of the reflected mode image, In addition to the transmissive mode image, the image can be bright, and the reflective mode image can be monochrome. In the case of a reverse display, it is also possible to electronically modify the image output using the controller 2 to correct the optical reversal. 2〇 can include, for example, an electronic reversal algorithm that depends on whether the backlight 18 is activated or not, that is, depending on the display 1 In the shot mode or the transmissive mode, when the backlight is activated, the algorithm can be electronically modified to the control number of the individual pixels to electronically invert the image in the transmissive mode so that the image is the same as in the reflective mode. The foreground/background scheme appears. If desired, a polarized light-diffusion layer can also be included as part of the reflective polarizer 16 to enhance the appearance of the image. The transflective is located between the liquid crystal panel U and the backlight 18, such that It can reflect light from an external source, such as indoor light or the sun. 123391.doc -14- 200815856 Referring next to Figures 6 and 7, there is shown a linear reflective polarizer 3 16 , a quarter wave film (QWF) 304, And laminate structures 300 and 400 that are non-polarized or polarized to retain diffuser 32. These laminate structures can be produced and sold to replace reflective polarizers 16 and QWF 204 shown in displays 10 and 200. UV curable Or the pressure sensitive adhesive 320 adheres the films within the laminate structures 300 and 400. The laminate structures may also optionally include a transparent bond for attaching the laminate to the glass 208 or other substrate. For example, the linear polarizer 316 can be an RDF or TDF reflective polarizer of the type described in U.S. Patent No. 6,124,971 to Ouderkirk et al., which is incorporated herein by reference. Optionally comprising a neutral density coating. In certain laminate construction embodiments, the quarter-wave film provides a quarter-wave delay for the visible wavelengths, particularly for red, green, and blue wavelengths. ^ , into W Er special state, example

For example, a linear reflective polarizer, such as the one described in the '971 patent, reduces the specular reflectance of the reflective polarizing element used to reflect the polarized light, and does not substantially overlap with the added reflex "the inverse of the element (four) or the transmitted transmission polarization). Light efficiency. Only: The diffusing element can be a polarization-retaining type because it does not randomize the enthalpy of light reflected or transmitted by the reflective polarizing element. Ideal diffusion: The piece has a high degree of forward light scattering', ie low reflectivity. This is advantageous for retaining the maximum selectivity of the polarized light used to reflect the polarizing element. Variable diffusion levels can be used depending on the application, ranging from almost no diffusion (mirror) to very high numbers (Lambert). The diffusing element can be used for the separation or lamination of the discrete optical element to the surface of the reflective polarizing element, and can be directly applied to the elliptical diffuser that does not scatter light in the manner of 123391.doc -15-200815856. performance. Further, a diffusion adhesive can be used as the diffusion element. In some exemplary embodiments, the reflective polarizer may also include a light absorbing film or a neutral density coating to optimize viewability under ambient illumination conditions while not significantly affecting the appearance of the display under backlight conditions. The light absorbing film may be a dichroic polarizer. The light absorbing film absorbs some of the diffuse reflected light from the backlight' to increase the efficient absorption of backlight illumination and increase the display contrast in ambient light conditions. In some embodiments, when backlighting, the overall effect of ambient illumination conditions has diffuse illumination characters that are opposite to the dark background, and dark characters that are opposite to the diffuse white background. Referring briefly to Figure 8, a display 500 using one of the overlays 300, 400 of the reflective polarizer 16 and the rear QWF 204 is shown. In addition, and in addition to not including reflective pixels (e.g., inner reflective layer 212 of FIG. 2), display 500 is substantially identical to display 200. Referring now more specifically to Figures 2 through 5, features of a display 200 configuration that effectively uses two types of transflective reflectors (212 and 16) are shown in series. The internal reflector 212 allows up to 90% of the pixel area to be used for image rendering, but since the display also includes a transflective 16 based on a reflective polarizer, which is external to the liquid crystal panel 14, the active area is for transmitting and reflecting images. Useful. In this manner, in an exemplary embodiment, up to 90% of the active area is used to reflect the image (in two different efficiencies) while still about 70% is used in the transmissive area. Display 200 includes a liquid crystal panel 14 that is positioned between the glass sheet and other substrates 206 and 208. In the reflective portion 220 of each pixel, the reflective layer 212 has a position 123391.doc -16 - 200815856 on top of the opaque pixel portion 2 1 0 , and in the transmissive portion 222 of each pixel, the liquid crystal material is thick and not reflected. cover. A quarter-wave plate 202 is interposed between the front polarizer 12 and the liquid crystal panel 14. The second quarter wave plate 204 is located between the liquid crystal panel 14 and the reflective polarizer 16. It should be noted that the second quarter-wave plate 204 is not required in all of the specific embodiments. For example, in a particular embodiment of the reflective polarizer 16 is a cholesterol reflective polarizer, the quarter wave plate 204 is not included. The quarter wave plate 204 is shown in dashed lines to represent its selectivity in such specific embodiments. Figure 2 illustrates a display 2 in a vertical state of liquid crystal with incident light for illustrative purposes. This is the dark state reflection mode. It should be noted that the incident ray 250 is reflected as a ray 252 that returns to the observer. The ray 254 begins with a point similar to the self-absorbed reflected light 250 up to the liquid crystal entering the transmissive region 222. Since the liquid crystal is in a vertical state and the light polarization state is not achieved, the light 254 continues in the left-handed (LHC) mode until it strikes the second quarter-wave film 204. At this point, it is converted to linearly polarized light and freely passed through the reflective polarizer 16. It is assumed that light is lost in the backlight system. It should be noted that the addition of a portion of the absorber layer to the reflective polarizer will reduce the percentage of light that can be re-entered into the LCD panel. Referring now to Figure 3, display 200 is in a liquid crystal state, which is a bright reflective mode in this particular display configuration. For a reflective mode with liquid crystals having,,,, (optically obvious) states, the LHC light from the incident ray 254 entering the liquid crystal is converted to right-handed (RHC) before exiting. It is then converted to linear polarization by a quarter-wave plate 204, reflected from the reflective polarizer 16, and returned through the system in exactly the same way as entering. This is represented by the exit light 256 123391.doc 17- 200815856. The quarter-wave plate 204 converts the ray 256 from linear to RHC, the liquid crystal converts the ray 256 from the RHC to the LHC, exits the quarter-wave plate 2〇2, converts the ray 256 from the LHC to linear 'and the light is minimally lossy Exit system. Referring to Figure 4, a display 200 operating in a dark state, transmissive mode backlight is shown. When the liquid crystal is in the down state, the light 260 transmitted through the backlight 18 is converted into LHc light by a combination of the reflective polarizer 16 and the quarter wave plate 204. The liquid crystal converts the light into an RHC which is then absorbed by a combination of the top quarter wave plate 202 and the front polarizer 12. Referring now to Figure 5', a display 200 operating in a stateless, transmissive mode backlight is shown. When the liquid crystal is in a vertical state so as not to modify the transmitted light 260, the LHC light hits the quarter wave plate 2〇2 at the top and the front polarizer 12 combines to produce a bright state that does not absorb light 260. Therefore, the liquid crystal vertical cancer display 200 is in a bright state in the transmissive mode and a dark state in the reflective mode. With the liquid crystal state, the display 2 is in darkness in the transmission mode and in the reflective mode. This produces a reverse display configuration. Extremely similar results can be obtained by removing the quarter wave films 202 and 204 and operating the display in parallel polarizer mode. The orientation of the reflective polarizer is chosen to work in two reflection modes (Ming and Multilayer). All numbers expressing quantities, measurements of properties, and the like, which are used in the specification and claims, are to be understood as being modified by the term "about' in all examples. Accordingly, the numerical parameters set forth in the specification and claims are approximations, which may vary depending on the desired properties of the 123391.doc -18-200815856 desired by those skilled in the art using the teachings of the present invention. . At the very least, and not as a limitation of the application of the principles of the claims Although the numerical ranges and parameters of the broad scope of the invention are approximated, the values set forth in the specific examples are described as precisely as possible. However, any value inherently contains errors that necessarily arise from the standard deviations found in their respective test measurements. The foregoing description is illustrative and not limiting of the scope of the invention. Variations and modifications of the specific embodiments disclosed herein are possible, and those skilled in the art will understand the actual alternatives and equivalents of the various elements of the specific embodiments. These and other variations and modifications of the specific embodiments disclosed herein may be made without departing from the scope and spirit of the invention. All patents and patent applications referred to herein are hereby incorporated by reference in their entirety in their entireties in the extent of BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of a portion of a transflective liquid crystal display having partially reflective pixels in combination with a reflective polarizer; and FIGS. 2 to 5 are more specific transflective liquid crystal displays. For example - a schematic side view of a part. 6 and 7 are schematic side views of a laminated film structure. The figure is a schematic side view of a portion of a transflective liquid crystal display using one of the laminated structures of Fig. 6 or 7. In the drawings, the same reference numerals are used to refer to the same elements. [Main component symbol description] 123391.doc -19- 200815856

10 Transflective liquid crystal display 11 Observer 12 Front polarizer 14 LCD panel 16 Reflecting polarizer 18 Backlight 20 Controller 22 Connection 24a-24g Pixel 26 Controller 28 Connection 29 Connection 200 Display 204 Quarter diaphragm 208 Glass 212 Internal reflection layer 220 Reflecting portion 222 Transmissive portion 224 Color filter 250 Incident ray 252 Ray 254 Ray 256 Light 300 Laminated structure 123391.doc -20- 200815856 304 Quarter wave film 316 Linear reflecting polarizer 320 Polarization retention Diffuser 330 Transparent Adhesive 400 Laminated Structure 500 Display 123391.doc -21-

Claims (1)

200815856 X. Patent Application Range: 1 · A transflective display having a reflective viewing mode and a transmissive viewing mode, the display comprising: a liquid crystal (LC) panel having a portion of a reflective pixel array, wherein the panel has The reflective portion of the partially reflective pixel array includes reflective metal on one of the viewer sides of the liquid crystal panel to reflect light back to the viewer; and a reflective polarizer 'which is located opposite the viewer side Behind the liquid crystal panel on one side of the liquid crystal panel, the reflective polarizer is oriented to reflect ambient light back to the viewer. 2. The transflective display of claim 1, further comprising a backlight, wherein the reflective polarizer is between the liquid crystal panel and the backlight. 3. The transflective display of claim 1, wherein the reflective portion of the partially reflective pixel array in the liquid crystal panel further comprises a metal on the side of the liquid crystal panel opposite the viewer side. 4. The transflective display of claim 1, further comprising a front absorption polarizer on the viewer side of the liquid crystal panel, wherein the reflective polarizer acts as a rear polarizer. 5. The transflective display of claim 4, wherein the reflective polarizer is a linear reflective polarizer. 6. The transflective polarizer of claim 5, wherein the linear reflective polarizer is a reflective display film (RDF). 7. The transflective polarizer of claim 5, wherein the linear reflective polarizer is a transflective display film (TDF). The semi-transmissive semi-reflective polarizer of claim 5, further comprising a first quarter-wave plate between the linear reflective polarizer and the liquid crystal panel and the same on the liquid crystal panel One ^ second quarter wave plate on the viewer side. 9. The transflective polarizer of claim 4, wherein the reflective polarizer is a line grid reflective polarizer. 10. The transflective polarizer of claim 9, further comprising a first quarter-wave plate between the line grid reflective polarizer and the liquid crystal panel and the viewer located in the liquid crystal panel A second quarter wave plate on the side. 11. A transflective display according to claim 4, wherein the reflective polarizer is a cholesterol reflective polarizer. 12. A laminated optical film comprising: a linear reflective polarizer; a quarter wave film; and a non-deviated diffuser. A transflective display comprising a laminated optical film as claimed in claim 12. 123391.doc