TW388023B - Reflective display - Google Patents

Description

B7 V. Description of the invention (1 Background of the invention 1. Scope of the invention The present invention relates to a reflective display using external light such as natural light for display, and more particularly to a kind of supplementary use when there is very little external light Illumination structure of an exhaust-type display. 2. The previous technology explained that the display device uses liquid crystal as a photovoltaic material. Its advantages are that the structure is manufactured in a flat, thin and light form, and the power consumption is low. Therefore, it has been developed These display devices are used as displays for mobile devices. Optoelectronic substances such as liquid crystals do not emit light, but can display images by allowing selective emission or blocking of external light. These passive display devices are classified into emission type and reflection type according to the type. In an emission display device, a panel is manufactured that supports, for example, liquid crystal as a photoelectric material between transparent substrates, and a light source (backlight) for illumination is provided on the back of the panel, and an image can be seen from the front of the panel. The emission type is For example, backlight is unavoidable, and for example, a cathode cathode tube is used as the light source. As a result, the backlight consumes the most power in the entire display's components, so the emission type is not suitable for use as a display for a mobile device. In other words, in a reflective display, a reflective plate is arranged on the back of the panel, and external light such as natural light is incident from the front and used. The reflected light can see the image from the front. Unlike the emission type, the backlight's light source is not used in the reflection type, so it consumes less power in the reflection type, so it is suitable as a & device for mobile devices. However, taking the reflective display as an example, it is not possible to see the image in the extremely low-light environment such as night time, which is the problem to be solved. • 4-A7 B7 V. Description of the invention (2) Summary of the invention The device design described in this article In order to solve the above-mentioned conventional problems, in detail, the reflective display according to the present invention is basically provided with a panel, two light guide plates, and a light source. The panel is provided with a transparent first substrate located at the entrance of external light, and (2) a second substrate, which is bonded to the first substrate, and a specified space is inserted between the two substrates on the side opposite to the first substrate; and Between the support by the photovoltaic material ', and an electrode' for applying a voltage to the photoelectric 2

And formed on at least one of the first substrate and the second substrate. The light guide is made of a transparent material group and placed on the outer boundary of the first substrate. The light source is placed at the end of the light guide plate to emit illumination light upon request. The reflective display according to the present invention is characterized in that the light guide plate generally allows external light 7 to be incident on the first substrate and allows the reflected outer light on the second substrate to be emitted. In other words, the light guide plate guides the illumination light as required, It is incident on the first substrate and allows the reflected light on the first substrate to exit. The advancement of the reflective display is characterized by an electrode plate and a quarter-wave plate connected in a laminated manner to the light guide plate and blocking external light or illumination light, which does not have to be reflected on the first substrate of the panel. Preferably, the panel uses a liquid crystal layer as a photovoltaic material, which acts as a quarter-wave plate β depending on the applied voltage. In this example, the liquid crystal layer is composed of a directional twisted nematic liquid crystal layer with positive dielectric anisotropy. When a voltage is not applied, its function is a quarter-wavelength plate, and when a voltage is applied, it loses the function of one of the four blades. More preferably, the light guide plate has a planar portion divided into stripe types and inclined portions located between adjacent planar portions and functions to reflect the illumination light guided from the light source on each inclined portion to the first substrate. The country's impoverished family (C is called A4 "(2wx297, published by A7 B7) Printed by the Central Consumers' Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperatives, Fifth, the description of the invention (3) and its function is to allow the illumination light reflected on the second substrate to pass from each plane Partially emitted. According to the invention, the 'light guide plate is placed in front of the reflective panel, and the light source is located at the end of the panel. The light source emits light in a dark environment, and the illumination light is incident on the panel side through the light guide plate to display the image. The light source is turned off in a bright environment, The image is displayed by directly using the external light passing through the light guide plate. The β light guide plate is basically transparent-so it does not cause difficulties when viewing the image in a bright environment. As described above, the light source according to the present invention emits light only when required, as a result Significantly reduce power consumption throughout the display 'so reflective displays are suitable for use as mobile device displays. In addition to the basic utility described above, this Ming provides a device to improve the image quality. In detail, a polarizing plate and a quarter-wavelength plate are first bonded to the back of the light guide plate, and a layered structure is placed in front of the panel. A quarter-wavelength is formed The optical anisotropic axis (optical axis) of the plate, so as to make an angle of 45 degrees with respect to the polarization axis of the polarizing plate. The layered structure of the polarizing plate and the quarter-wave plate allow the emission of external or illumination light, in other words < Block external light or illumination light that does not have to be reflected on the panel. For example, suppress unnecessary inter-plane reflection of the electrode formed on the first substrate in the incident side. As a result, suppress the periodic chirp structure (diffraction grating) due to the light guide plate The interference fringes are caused to get a good display. In addition, unnecessary reflection on the surface of the first substrate on the incident side is also suppressed. As a result, the contrast of the image displayed on the panel is prevented from deteriorating. The diagram is simply explained- ', Figure 1 Partial cross-section. View—said .. belongs to the root ... according to the present invention ..... shows the embodiment of a reflective display 'and Figure 1 also shows' shows the use of reflective displays in a dark environment. (Cns) (210x297 ^) ( Please read the precautions on the back before filling in this page) Installation · A7 B7 V. Description of the invention (4 The cross-sectional view of Figure 2 illustrates a reference example of a reflective display.-The schematic diagrams from BA to Figure 30 are on the board.:, Figure 2 A light guide showing a reference example == illustrates the operation of the example shown in FIG. 5 according to the present invention. Figure 5 shows the operation of the example shown in [].]-Part of Figure 6-Cutaway perspective illustration ^ ^ ^ ^ ^ ^ ^ ^ ^ Another Example: The reflective display of the invention is shown in FIG. 7—intent. A reference example for explaining a light guide plate β The schematic diagram of FIG. 8 illustrates a reference example of a repeating display, which uses the light guide plate shown in FIG. The ear 9A and the figure show the cause of the spurious pattern, which appears in the reference example of the reflection type, display, and display device shown in FIG. 8. Please read the precautions on the back first and write k. The main component symbol of the printed image of the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs of this clothing page. 0 Panel 12 Polarization layer 1 First substrate 15 Resin film 2 Second substrate 16 Metal film 3 Liquid crystal Layer 20 Light guide plate 4 Liquid crystal molecules 21 Inclined portion 1 6 Upper orientation film 22 Plane portion _ 7 Bottom orientation film 25 — End 8 Reflective layer 26 Upper surface 10, 11 Electrode 27 Side This paper size applies to China National Standard (CNS) A4 Specifications (210X297mm) A7 B7 V. Description of the invention (5 28 Bottom side 80 Quarter wave plate 30 Light source 80S Optical axis 31 Reflector 201 »202 Diffraction grating 40 Insertion layer 203, 204, 204a Circular polarized light 50 thin m transistor 205 parallel linear polarized light 60 color filter layer 205 orthogonal linear polarizer 70 polarizing plate 206 emitted light 70P emission axis Please read the note first. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The schematic cross-sectional view of FIG. The reflective display in the embodiment β of the device is basically composed of a panel 0, a light guide plate 20 ′, and a light source 30. The panel 0 is provided with a transparent first substrate iW, which is made of glass filling, and is located on the incident side of external light. The second substrate 2 that is in contact with the first substrate is inserted in a fixed space on the opposite side, and the optoelectronic substance such as the liquid crystal layer 3, or, for example, nematic liquid crystal, is supported between the two substrates. For example, made of glass The manufactured transparent first substrate 1 is provided with a color filter layer 60 'or a photoresist layer such as a color dispersion, in addition to, for example, an electrode 10 manufactured by IT0, and an electric calendar is applied to the liquid crystal layer 3'. Second The substrate 2 is made of glass, for example, and is provided with a reflective layer 8 made of aluminum to reflect external light. The function of the reflective layer 8 is also an electrode to apply a voltage to the liquid crystal layer 3. Therefore, in this embodiment, 'through the top and bottom electrodes Applying a voltage to the liquid-crystal layer 3 controls the photoelectric characteristics. However, the present invention is by no means limited to this embodiment, which depends on the operation mode of the photoelectric substance. In some examples, only the items can be set and then filled out. 8 This paper size applies National Standards (CNS) eight 4 said grid (210Χ297 mm A7 Ministry of Economic Affairs Bureau of Standards Employees Consumers Cooperative India with f

A7 B7 5. Description of the invention (7 reflection between the color filter layer 60 and the electrode 10. In this embodiment, for example, if a liquid crystal layer 2 functions as a quarter-wave plate corresponding to an applied voltage, it is regarded as panel 0. Use of Photoelectric Substances》 Liquid crystal layer 3 is composed of a directional twisted nematic liquid crystal layer with positive dielectric anisotropy. Its function is a quarter-wavelength plate during the time when no voltage is applied, and its function during the application of the electric signature is Quarter-wavelength plate. The light guide plate 20 has separate band-shaped surface portions 22 and inclined portions 21 located between the planar portions 22. The illumination light guided from the light source 30 is reflected on the inclined portion 21. And the illumination light reflected from the second substrate 2 enters the first substrate 1 'and is emitted from the flat portion 22. The central standard bureau of the Ministry of Economic Affairs MB: Industry and Consumer Cooperatives printed a schematic sectional view of FIG. 2 to illustrate a reference example of a reflective display. This reference The example shows a comparison to clarify the application of the present invention. In this reference example, the light guide plate 20 and the first substrate 1 of the panel 0 are interposed therebetween with a transparent interposing layer (for example, made of resin) and bonded to each other β Illumination on the interface between the guide plate 20 and the first substrate 1. Unnecessary reflection of light and external light can be suppressed by sufficiently setting the refractive index of the insertion layer 40. In other words, in this reference example, the insertion layer 40 is used to Replacing the layered structure of the polarizing plate and the quarter-wave plate to suppress unnecessary reflection. The insertion layer 40 is composed of, for example, an adhesive transparent resin. The resin is coated on the first substrate of the panel! The surface, and the light guide plate 20 is stuck on The above b needs optical matching to suppress unnecessary reflections. The resin of the interposer and the resin of the light guide plate and the first substrate 1 should be selected so that the refractive indices of these resins are approximately the same. For example, when the first substrate 1 is composed of glass, the resin ( The refractive index of its insertion per 40% should be about 1.5. In order to ensure that there is no air bubble between the light guide plate 20 and the panel 0, it is desirable to use a low viscosity resin. -10-

V. Description of the Invention (8) FIGS. 3A to 3C show the detailed structure of the light guide plate 20 shown in FIG. 2. Fig. 38 shows a plan view 'Fig. 3 B shows a cross-sectional view' and Fig. 3 c shows an enlarged cross-sectional view. The bottom side 28 of the plate-shaped light guide plate 20 is bonded to the panel 0. When the adhesive resin adheres to the upper surface 26 'and the side surface 27 of the distal end 25' of the light guide plate 20, the optical function is deteriorated. Therefore, when the light guide plate 20 and the panel 0 are joined together with an ultraviolet curing resin, that is, it is required to cover the end 25, the upper surface 26, and the side surface 27 of the light guide plate 20 with an adhesive tape. After the light guide plate 20 and the panel 0 are joined, that is, Join together. Actually 'Take the light guide plate installed in front of the panel as an example. If the air layer is inserted between the light guide plate and the panel, the refractive index of air is not equal to the refractive index of the panel' and it is not equal to the refractive index of the panel. About 10%. This reflected light does not require the panel to switch photoelectrically, which makes the contrast of reflective displays extremely poor. In order to cope with such inter-interface reflection, in the reference example shown in FIG. 2, the light guide plate and the panel are joined by a transparent resin, and the resin has a refractive index approximately equal to the light guide plate and the panel refractive index. However, this joining work is cumbersome, which results in a complicated process and reduces the yield. For example, in some cases, when the light guide plate and the panel are bonded together, there must not be excessive adhesive in the space between the two, and if the adhesive is accidentally adhered to other components, the appearance of the reflective display may be dirty. In other words, taking the structure of the present invention shown in FIG. 1 as an example, only by bonding a layered structure including a polarizing plate and a quarter wave plate on the back of the light guide plate, the unnecessaryness of the panel 0 can be suppressed. reflection. Another method is to form a reflection conversion film (such as a multilayer film) on the back surface of the light guide plate and the surface of the panel. This method is known to suppress unnecessary reflection at the interface between the light guide plate and the panel. However, the formation of an antireflection film significantly increases the manufacturing cost. In other words, the present invention uses 11-A7 B7 V. Explanation of the invention (9 The polarizing plate and the quarter-wave plate are originally used as necessary components of a reflective display, so the manufacturing cost is basically not increased. Figure 4 A partial cross-sectional view illustrates a detailed example of a reflective display according to the present invention. These elements corresponding to the elements of the embodiment shown in FIG. 1 have the same reference numerals as the elements shown in FIG. 1 for ease of understanding. In this example, TN_ECB ( Twisted nematic electrical control birefringence) mode liquid crystal panel. In the figure, this reflective display has a structure in which independent light guide plates 20 and panel 0 are joined together. Β inclined portion 21 and flat portion 22 are formed on The surface of the light guide plate 20. The size of the light guide plate 2 is as 90 × 〇2 () fiber, and the end thickness on the side close to the light source is 3 2 mm, while the end thickness on the opposite side of the light source is 0.2 nun. The light guide The plate is composed of, for example, a transparent acrylic plate, and the inclined portion 21 and the flat portion 22 can be machined with a diamond cutter to have a bevel angle of 135 degrees. The position period of the inclined portion 21 The 120-degree polarizing plate 70 and the quarter-wavelength plate 80 are bonded to the rear surface of the light guide plate 20. The light guide plate 20 having the layered structure as described above is placed on the surface of the panel 0. The panel 0 is formed by containing An element formed by inserting a predetermined space into a first substrate 1 (for example, a transparent glass plate), which is located on the incident side of external light, which is in turn located on the second substrate 2 on the opposite side. Nematic liquid crystal layer 3 For example, it is supported in the space between the substrates 1 and 2. The liquid crystal molecules 4 are hinged from the upper and lower orientation films 6 and 7. The electrodes 10 and 11 are formed on the inner surfaces of the substrates 1 and 2, and a voltage is applied. Nematic liquid crystal layer 3 on each pixel. In this example, the 'electrodes formed on the first substrate i' are patterned in the form of stripes to form the electrodes formed on the second substrate 2 '(e.g., ITO). (Manufacturing) is patterned in the form of stripes. The electrodes 10 and 1 i are formed orthogonal to each other, and form a so-called brief note. Please fill in the production and write this page. Seal -12

V. Description of the invention (10A7 B7 A single matrix is printed by the Central Laboratories of the Ministry of Economic Affairs of the Bayan Consumer Cooperative, and one pixel is formed at each intersection. The reflective liquid crystal display device with the above structure is a TN-ECB type normal white Mode device. When no voltage is applied, the nematic liquid crystal layer 3 supports the direction of the hinge, and is used as a quarter wave plate, and allows external light to pass through and pass through the polarizing plate 70 and the quarter wave plate 80. It is displayed as white. When a voltage is applied, the nematic liquid BE) layer 3 becomes vertical and loses the function of a quarter-wave plate, and -j ·. Blocks external light and passes through the polarizing plate 70 and The cooperation of the quarter-wave plate 80 shows black. Continued, the following describes each element in detail with reference to FIG. 4. As described above, the polarizing plate 70 is placed on the surface of the first substrate 1 of the panel 0, and the quarter-wavelength The plate 80 is interposed between the polarizing plate 70 and the first substrate i. The quarter wave plate 80, for example, shows a stretched polymer film 'and produces a phase difference corresponding to a quarter wavelength between normal light and abnormal light. The angle of the direction of the optical axis (an anisotropic axis) of the quarter-wave plate 80 with respect to the polarization axis (emission axis) of the polarizing plate 70 is 45 degrees. After passing through the polarizing plate 70, the external light becomes a linearly polarized light. After passing through the quarter-wave plate, the circularly polarized light becomes linearly polarized again. In this example, the polarization direction is 90 degrees different from the original polarization direction. As described above, the 'quarter wave plate' can be polarized by incorporating a polarizing plate, and this phenomenon can be used for display. Panel 0 uses a nematic liquid crystal layer 3 composed of nematic liquid crystal molecules 4, which has a substantially horizontal dielectric anisotropy as a photovoltaic material. The nematic liquid crystal layer 3 has a suitable thickness and can be used as a quarter wave plate. In this example, the refractive index anisotropy Δη of the nematic liquid crystal layer 3 is about 0.7, and the thickness of the nematic liquid B々 is, for example, about 3 μm. Therefore, the hysteresis of the nematic liquid crystal layer 3 is -13-

Please k. Read the note at the back and then bind A7 B7. 5. Description of the invention (△ η. D ranges from 0.2 to 0.25 μηι. In the figure, the above hysteresis value can be made roughly by the hinge direction of the nematic liquid crystal molecule 4 Becomes approximately 0.15 (15nm). This value is approximately equivalent to 1/4 of the intermediate wavelength of the external light, and the optical function of the nematic liquid crystal layer 3 is a quarter-wavelength plate. The nematic liquid crystal layer 3 is placed on a polymer substrate. An amine-made upper alignment phosphine 6 and a bottom alignment film 7 are used to obtain a desired hinge direction. The liquid crystal molecules 4 allow the rubbing direction of the alignment film 6 on the side of the first substrate and the liquid crystal molecules 4 allow the second substrate to be aligned. The rubbing directions of the alignment film 7 on the 2 side are aligned. The rubbing directions of the alignment film 6 and the alignment film 7 are different from each other by 60 to 70 degrees to obtain a desired hinge direction. The reflective layer 8 forms an electrode on the second substrate 2 side丨 丨 Bottom. The reflective layer 8 has convex and concave surfaces on the surface to scatter light. Therefore, the appearance is white paper, which is best used as a display background, and because the reflective layer 8 reflects incident light over a wide range of angles, it can be obtained Wide viewing angle for easy display And the brightness of the display is increased for a wider viewing angle. A transparent polarizing layer 12 (for example, made of acrylic resin) is inserted between the reflective layer 8 and the electrode 11 to planarize both the convex and concave surfaces. The reflective layer 8 contains a resin film 15 whose shape is convex and concave, and a metal film μ manufactured by Ming is formed on the surface of the resin film 15. The resin film 15 is a light-sensitive lipid film, please read the note on the back by lithography matter

Side by side, the Central Government Standards Bureau of the Ministry of Economic Affairs printed the seals of the consumer cooperatives and patterned them into convex and concave forms. The photoresist is fabricated on the entire surface of the substrate. The photoresist is exposed to pattern 1 | dagger in the form of, for example, a cylinder. The photoresist is then heated and reflowed to form stable convex and concave surfaces. On the convex and concave surfaces formed as described above, a metal film 16 made of, for example, a desired thickness and good reflection is formed of aluminum. Number of convex and concave depths can bring good light-scattering special light resin film 15 for example by inserting-desired photomask -14-This paper size applies to China National Standard (CMS) A4 specification (_210X297 public A7, B7 ~ * --------- 5. Description of the invention (12), and the color of the reflective layer 8 is white. On the surface of the reflective layer 8, a polarizing plate 12 is formed to planarize the convex and concave surfaces. The polarizing plate 12 Composition of a desired transparent organic substance such as acrylic resin. The insertion of the polarizing layer 12 helps to form a stable electrode 11 and an alignment film 7. For details of the basic operation of the reflective display shown in FIG. 4, refer to FIG. 5 » The state where no voltage is applied is displayed in OFF, and the state where voltage is applied is displayed in ON. In (OFF), the reflective display has the following structure, that is, the polarizing plate 70 is viewed from the viewer, quarter One of the wavelength plates 80, the nematic liquid crystal layer 3 ', and the reflective layer 8 are sequentially stacked in layers. Here, the light guide plate is omitted for easy understanding. The polarization axis (emission) of the polarizing plate 70 is represented by 70P. The optical axis 80S of the quarter-wave plate 80 and the emission axis 70P 45 degree angle. In addition, the orientation direction 3 of the liquid crystal molecules 4 on the first substrate side is parallel to the polarization axis (emission axis) of the polarizing plate 70. After the plate 70 becomes a linearly polarized light 202. The polarization direction is parallel to the emission axis 70P, and the linearly polarized light 2 is hereinafter referred to as parallel linearly polarized light. After passing through the quarter-wave plate 80, the parallel linear light The polarized light 202 is converted into circularly polarized light 203. After being transmitted through the nematic liquid crystal layer 3, the circularly polarized light 203 is converted into linearly polarized light to serve as a quarter-wave plate. The polarization direction of the linearly polarized light is turned 9 °. And perpendicularly intersect with the parallel linearly polarized light 202. The 90 ° linearly polarizing plate is referred to as orthogonal linearly polarized light. The orthogonally linearly polarized light 203 is reflected on the reflective layer 8 and passes through the nematic liquid crystal Layer 3 'is used as a quarter-wave plate 80, which occurs when the positively polarized linear light 203 is converted into circularly polarized light 204 B. In addition, when the circularly polarized light 204 is converted into the original parallel When linearly polarized light is 2.05, Round-15- This paper size is applicable to China National Kneading (CNS) A4 specification (210x297 male shame) ---- A7 ------------ B7 'V. Description of invention (13) Shaped polarization The light 204 passes through the quarter-wave plate 80. The + line of linearly polarized light 205 passes through the polarizing plate 70 and is converted into an outgoing light 206, which is viewed from the viewer 'and a white display is obtained. In the applied voltage (ON) state, the liquid crystal molecules 4 turn from the hinge direction to the vertical direction and lose the function of a quarter-wave plate. When the external light 201 passes through the polarizing plate 80, it turns into parallel linearly polarized light 202. When the parallel linearly polarized light passes through the quarter-wavelength plate 80, the parallel linearly polarized light 202 is converted into a circularly polarized light 203. The circularly polarized light 203 passes through the nematic liquid crystal layer 3 and is reflected on the reflective layer 8 and reaches the quarter-wavelength plate 80 because it is circularly polarized light 204a. When the circularly polarized light 203 passes through the quarter-wave plate rib, the circularly polarized light 204a is converted into orthogonal linearly polarized light 205a. Since the orthogonal linearly polarized light 205a cannot pass through the polarizing plate 70, the display becomes black. Printed by the Employees' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. In order to easily understand the present invention, reference is made to the example of FIG. 6 to illustrate the non-reflective suppression operation. In the figure, the reflective display has a structure including: a polarizing plate 70, a quarter-wave plate 80 ', a first substrate 1, a liquid crystal layer 3, a polarizing layer 12, a reflective layer 8, and a stacked layer in order from top to bottom. The second substrate 2 ^ is omitted from the figure for ease of understanding. In this example, the light reflecting layer 8 is also used as the electrode 11. The electrode 11 is divided into a matrix form and functions as a pixel electrode. A thin film transistor 50 made of, for example, polysilicon drives each electrode and forms a known active matrix display device. The emission axis of the polarizing plate 70 is shown in a striped pattern in the figure. The optical axis of the quarter-wavelength plate 80 forms a 45-degree angle with the emission axis (polarization axis) of the polarizing plate 70. The function of the liquid crystal layer 3 is a four-wavelength plate in the off state. When the incident light passes through the polarizing plate 70, the incident light, such as illumination light or external light, is converted into parallel linearly polarized light. When the parallel linearly polarized light passes through -16- this paper size applies to the Chinese National Standard (CNS) A4 specification (210X297) %) — A7 B7 V. Description of the invention (14

When the page order is m-wavelength, the parallel linear polarizing plate is converted into circular polarization first. : Outer 'When the circularly polarized light passes through the liquid crystal layer 3, the circularly polarized light is converted into positive and linearly polarized light. Orthogonal linear polarization is diffused on the reflective layer, and is converted into circularly polarized light by the liquid crystal layer 3, and then converted into parallel linearly polarized light by a quarter-wave plate. Therefore, the parallel linearly polarized light does not change when it passes through a polarization of 70, and the viewer sees-emits light. A quarter-wavelength plate _ incident light is converted into circularly polarized light ′, and part of the mirror is reflected on the interface between the electric _ and the substrate [. The non-essentially circularly polarized light reflected by the mirror is converted by the quarter-wave plate 80 into orthogonal linearly polarized light. Because the plane of polarization is orthogonal to the emission axis, it absorbs orthogonally linearly polarized light reflected on the interface. Therefore, it will always absorb unnecessary reflected light. Therefore, the quality of reflective display can be improved according to the invention. The material shown in Figure 2 + Example: The light guide plate and panel can be made of transparent resin between the panel and the light guide plate. Join to suppress unnecessary reflection on the interface between the panel and the light guide plate. However, since a transparent resin is used in this method, unnecessary reflection on the interface between the electrode 10 and the substrate cannot be suppressed. In other words, in the method of the present invention, a layered structure is used, which includes a polarizing plate and a quarter-wave plate, which can not only block unnecessary reflections on the interface between the panel and the light guide plate, but also block the space between the electrode and the substrate. Unnecessary reflections on the interface. Printed by the Central Consumer Bureau of the Ministry of Economic Affairs, Consumer Cooperatives Suppression of unnecessary reflections on the interface between the electrodes and the substrate is particularly effective for improving the image quality of reflective displays that use a light-guide plate with a periodic structure. Suppression of unnecessary reflections can lead to de-removing interference fringes. The removal of dry & fringes is described below. As described below, because of its low power consumption, the reflective display is the star of tomorrow for mobile information terminals. -17 This paper size is applicable to China National Standard (CNS) A4 (2Ι〇χ297mm A7 B7

Please read the back note first

Page I order

B7 V. Description of the invention (16) The interfering fringes are more obvious when the curtain is opened. In other words, when a viewer's line of sight is inclined toward the inclined surface facing the inclined portion 21, interference fringes are more pronounced. The greater the inclination of the line of sight, the clearer the interference fringes (unreal lines). 9A and 9B printed by the Central Standards Bureau of the Ministry of Economic Affairs and Consumer Cooperatives illustrate the generation of spurious patterns. The figure in Figure 9A emphasizes the first substrate 1 (consisting of glass) and the electrode 1 〇 (including IT0 Transparent conductive film) unnecessary illumination light reflected on the interface 1/10. The graph of FIG. 9B emphasizes the main illumination light reflected by the light reflecting layer 8 formed on the second substrate. In both figures, the light guide plate 20 is folded relative to the reflective surface for easy understanding. In Fig. 9A, the light guide plate 20 functions as a diffraction grating 201 because the inclined portion 21 and the planar portion 22 are periodically arranged. The illuminating light passing through the diffraction grating 201 is easily mirror-reflected on the interface 1 / io, and passes through the light guide plate 20 again. When the light guide plate 20 functions as the diffraction grating 202, a pair of diffraction gratings 201 and 202 are complementary. The same result is that the illumination light reaches the viewer through the diffraction gratings 201 and 202. The first-order diffracted light and the second-order diffracted light interfere with each other to form a chaotic pattern. For example, the diffracted grating 201 separates the illumination light into the zeroth-order diffraction light and the first-order diffraction light. The diffraction light is then diffracted by the diffraction grating 202, and is divided into zero-order diffraction light and first-order diffraction light. In particular, first-order diffraction light generated from the first zero-order diffraction light and The zeroth-order diffraction light generated by the first-order diffraction light strongly interferes with each other, because the total orders are equal to each other. The incident light from the cathode tube is reflected by the inclined portion 21 of the light guide plate and is introduced into the interface by 1/10. The light reflected as a mirror on the interface is parallel light. Parallel incident light and parallel reflected light mutually & because the light passes through the same path. This interference is the cause of spurious patterns. In other words, as shown in FIG. 9B, the illumination light reflected on the reflective layer 8 (the original -19- this paper size applies to the Chinese national standard (CNS > A4 specification (210X297 mm))

V. Description of the invention (17) The soldier will scatter light) and will not cause interference. The illumination light reflected on the reflective layer 8 contains a mixture of zeroth-order diffraction light and first-order diffraction light, and does not cause interference, so it will not cause interference. Produces a moire pattern. In order to suppress the above-mentioned spurious lines, the polarizing plate 70 and the quarter-extinguishing long plate 80 included in the layered structure of the present invention are bonded to the back surface of the light guide plate 20. The polarizing plate 70 and the quarter-wave plate 80 cooperate with each other to suppress the unnecessary reflection of the illumination light on the electrode 10. As a result, the random structure can be substantially removed due to the periodic structure of the light guide plate 20. As described above, the light guide plate according to the present invention is placed on a reflection type panel, and an auxiliary illumination light is provided on the end of the light guide plate. The light guide plate generally allows external transmission, which is incident on the panel, and allows external light reflected on the panel to be emitted. In other words, the light guide panel guides the illuminating light as required, which is incident on the panel and allows reflection on the panel. Illumination light is emitted. The image can be viewed in a dark environment by illuminating the light source, although this is a reflective panel. Change the foot, in a bright environment full of external light, you can turn off the light source to save power. A layered structure including a polarizing plate and a quarter-wave plate is bonded to the back surface of the light guide plate 'to block unnecessary reflection of the panel, thereby improving the quality of the display screen. (Please read the precautions on the back before loading 1:: fill in this page) · ?! Printed by the Shellfish Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs-20- This paper size applies to China National Standard (CNS) A4 (210x297) Tung >

Claims (1)

A8 B8 C8 D8 Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperatives 6. Application for patent scope 1_ A reflective display, including: a panel 'has a transparent first substrate on the incident side of external light, and a second substrate Is connected to the first substrate, a specified space is inserted between the two and is located on the side opposite to the first substrate, a photoelectric substance is disposed in the space, and an electrode, although a voltage is applied to the Optoelectronic substance formed on at least any one of the .1 substrate and the 2nd substrate of the curtain_JL;-a light emitting device 'having a transparent light guide placed outside the sound-flat on "and a light source The light guide plate is provided on the end of the light T guide plate to emit prescribed illumination light; wherein the light guide plate normally allows the external light to be emitted, which is incident on the first substrate, and allows the outer boundary to be reflected on the second substrate. The light is emitted, in other words, the pilot plate guides the illumination light according to the regulations, which is incident on the first substrate and allows the illumination light reflected on the second substrate to exit; the two i-plates and the quarter-wave plate;In the polarizing plate and the quarter wavelength plate stack engagement in the light guide plate, and light shielding is not necessary beyond the boundaries or illumination light reflected on the first substrate of the panel. 2. (The main application patent Fangu Item 丨 a reflective display, in which the panel uses a liquid crystal layer as a photoelectric substance, and the function of this photoelectric substance is a wavelength wave plate according to the applied voltage .... '' 3. For the reflective display of the scope of application for the patent! Item, wherein the photoelectric object (by the orthotropic twisted nematic liquid crystal layer group with JL dielectric anisotropy-21-this paper size applies Chinese National Standard (CNS) A4 Xie Ge (210x297 public director) -------- "Yuan-,-. * /. (Please read the back of the article ^ h before filling out this page) Order T " Λ8 B8 C8 D8 Application The scope of the patent is, 'When no electric power is applied, the function is _four points also ^^ When a voltage is applied, one quarter of the _wavelength plate work is lost. Type display storm, in which the light guide plate has divided into several Qin-style | several plane parts, points .. and i in the plate ^ points of the inclined part: points, and the participants can prepare-guide roar from ... each tilt Illumination of the light source on the part to which the light is reflected—the light is reflected to the ^ th substrate, and the function of the light is to reflect the light on the nineth surface—light 4 ^ ^ * v As the reflection type Wengqin 1 of the scope of patent application, where the layered structure of the polarizing plate and the quarter-wavelength plate 乂 ^ between the face tertiary and the plate》 ------ -^-装-(Please read the notes on the back of the page before filling in this page} J \ · Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperative, -22-t paper size applies to China ’s poor families (CNS) A4 * l grid (210X297 mm)