TW594254B - Reflector and liquid crystal display with the same - Google Patents

Abstract

A reflector and a liquid crystal display with the same are provided. The reflector is formed on a transparent substrate and consists of an adherent layer, a Ag-Ti alloy layer, and a protection layer. The adherent layer is on the transparent substrate. The Ag-Ti alloy layer is on the adherent layer. The protection layer is on the Ag-Ti alloy layer. Moreover, the thickness of the Ag-Ti alloy layer can be controlled to achieve the need of total reflection or semi-reflection. Since the reflectivity of the Ag-Ti alloy layer is 95% and it is inexpensive, the liquid crystal display with the Ag-Ti alloy layer as a reflector is also inexpensive and has high reflectivity.

Description

594254 Case No. 92109866 Amendment V. Description of the Invention (1) Field of the Invention The present invention relates to a reflective plate structure of a liquid crystal display (1 iquidcrysta 1 display, LCD for short), and particularly to a silver titanium Alloy reflecting plate and liquid crystal display having such reflecting plate. Prior technologies In recent years, the development of liquid crystal displays has become more widely used with electronic components in combination with more complete functions. However, the production of relatively liquid crystal display elements has become more and more complicated. Since the liquid crystal display is a non-self-luminous display, an external light source is required to provide sufficient brightness of the liquid crystal panel. Depending on the light source, it can be divided into three types: transmissive liquid crystal display, transflective liquid crystal display and reflective liquid crystal display. The transmissive liquid crystal display depends on the backlight module as the light source, so whether the surrounding environment is bright or not, the backlight module must be lit when using the transmissive liquid crystal display to achieve the display function. However, the backlight module consumes an average of When the LCD monitor loses more than 60% of its power, it is necessary to find new power-saving technologies when designing portable products such as mobile phones, personal digital assistants (PDAs) and e-books. Its high power consumption. Therefore, in recent years, reflective liquid crystal displays using external light sources have gradually received the attention of all parties, which can greatly improve the problem of high power consumption of liquid crystal displays. Taking a twisted nematic (TN) or super twisted nematic (STN) reflective liquid crystal display as an example, it mainly coats a reflective plate on the lower substrate of the liquid crystal panel, and the reflective plate has the function of reflecting external light sources When the external light is sufficient, its display quality is good. It can be seen that the reflective liquid crystal display

10594twf1.ptc Page 6 594254 a_Amendment_Case No. 92109866 V. Description of the Invention (2) The device does not require a backlight module to achieve the display purpose, and its power consumption is greatly reduced. However, if an appropriate light source, such as a front light source (front 1 ight), is not provided, the reflective liquid crystal display cannot be used in a weak environment. The transflective and transflective liquid crystal display can be regarded as the integrated structure of transflective and reflective liquid crystal displays. It not only has the advantages of low power consumption, but also can be used in the environment with weak external light. The reflective liquid crystal display has been widely used in various portable products. As shown in FIG. 1, it is a schematic cross-sectional view of a reflective plate of a conventional reflective liquid crystal display. Please refer to FIG. 1. The reflective plate of the liquid crystal display is formed on a glass substrate 100 and is composed of an Ai alloy layer 102 and a layer of dioxide between the glass substrate 100 and the aluminum alloy layer 102. Silicon (S i 02) protective layer is composed of 104. However, the traditional use of aluminum alloys such as A 1 N d as reflective materials has the following disadvantages, including reflectance of about 89%, high absorptivity of about 15%, poor hardness, and very sensitive to alkaline substances. The reflective plate of another reflective liquid crystal display is shown in FIG. 2. Fig. 2 is a schematic cross-sectional view of a conventional reflector of a liquid crystal display. Please refer to FIG. 2. At present, a reflective plate of a reflective liquid crystal display is formed on a glass substrate 200 and is composed of an Ag alloy layer 202 between the glass substrate 200 and the silver alloy layer 202. It consists of a titanium dioxide (Ti02) adhesive layer 204 and a '^ emulsified copper (1 ^ 203) protection layer 206 on the silver alloy layer 202. Although, silver alloys such as AgPd alloys are currently being used,

10594twf1.ptc Page 7 594254 _ 92109868 ^ _ _ V. Description of the invention (3)

AgPdCu alloy is used as a reflective material < to increase the reflectance and reduce the absorption rate, but because the target material for the silver alloy layer is added with about 2% of the precious metal palladium (pa 11 ad ium, chemical weapons is Pd) ' Its production cost is higher than that of the reflector plate that is usually made of Ming alloy, which makes it uncompetitive. According to the invention, the present invention adds reflection to the reflection of the reflection plate, and then totally reflects the above-mentioned layer and the titanium alloy. This amount of reflection uses ordab 1 and silver alloy gold film thickness liquid crystal display for light display. It is used to increase the cost and reduce the reflection. It is used for the plate, alloy, silver-gold layer and semi-large plate to reduce the reflection of silver. Titanium composite reflection on a titanium plate is used because the disk-rec ratio (> 95%) is used for a liquid crystal alloy or a silver-titanium composite semi-reflective. The purpose of the present invention is to provide the reflectivity and reduce the absorption of a liquid crystal display. One object is to provide a reflective plate for a liquid crystal display, which has a manufacturing cost and makes it competitive. One object is to provide a reflective plate for a liquid crystal display, and a semi-reflective liquid crystal display. 2Its purpose, the present invention proposes a liquid crystal display; a transparent substrate, and at least consisting of an adhesion layer, a protective layer, and a protective layer, and the adhesive layer is located on the 'Benji two adhesive layer, and the protective layer is located on The silver demand can control the thickness of the silver-titanium alloy layer to achieve full Γ. The cost of silver-titanium composite reflectors in the f-type optical disc (compact abbreviation CD-R) industry is low and low. ^ And the characteristics of its protective layer, to control the reflector of the indicator by 1 = 予 °. In order to make a total reflection or out-type LCD display, it includes at least an upper half,

10594twfl.ptc f Page 594254 _Case No. 92109866_ Year Month__ V. Description of the invention (4) The lower half and the liquid crystal layer between the upper and lower half, where the upper half includes an upper transparent A substrate, an upper electrode layer on the upper transparent substrate, and a first alignment film on the electrode layer; and the lower half is opposite to the upper half, and its structure includes a lower transparent substrate and a silver on the lower transparent substrate A titanium alloy reflective stack, an insulating layer on the silver-titanium alloy reflective stack, a lower electrode layer on the insulating layer, and a second alignment film on the lower electrode layer. The silver-titanium alloy reflective stack includes an adhesion layer, a silver-titanium alloy layer on the adhesion layer, and a protective layer on the silver-titanium alloy layer. The present invention further provides a color liquid crystal display, which includes at least an upper half, a lower half, and a liquid crystal layer located between the upper half and the lower half. The upper half includes an upper transparent substrate, and an upper transparent substrate. An upper electrode layer and a first alignment film on the electrode layer; and the lower half is opposite to the upper half, and its structure includes a lower transparent substrate, a silver-titanium alloy reflective stack on the lower transparent substrate, and a silver A color filter on the titanium alloy reflection stack, a lower electrode layer on the color filter, and a second alignment film on the lower electrode layer. The silver-titanium alloy reflective stack includes an adhesion layer, a silver-titanium alloy layer on the adhesion layer, and a protective layer on the silver-titanium alloy layer. In addition, the present invention can control the thickness of the silver-titanium alloy layer in the silver-titanium alloy reflective stack to meet the requirements of total reflection and semi-reflection. Reflective characteristics; and when the thickness of the silver-titanium alloy layer is between 100 and 400 angstroms, it has a semi-reflective characteristic formula. In addition, if it is a full-color liquid crystal display, a color filter (co 1 o: r

10594twfl.ptc Page 9 594254 --- --- Case 5 Tiger 92109866 ______ ^ Month Day Amendment V. Description of Invention (〇-filter). Since the silver-silver alloy reflective stack has a low absorption rate of up to 95% and a low absorption rate of about 6% and a low cost, the liquid crystal display using the silver μ-reflective stack also has high reflection. Rate and low cost. In order to make the above and other objects, features, and advantages of the present invention clearer, and "the preferred embodiments are given below, and in conjunction with the drawings, the detailed description is as follows: Fig. 3 is a sectional view of a reflecting plate according to a preferred embodiment of the present invention. Please refer to Fig. 3, the reflecting plate of the present invention is formed on a transparent substrate 00 'and at least consists of an adhesive layer (adherent! ayer) 304, a silver layer a gold layer 302, and a protective layer (proytecion iayer) 306. The adhesion layer 304 is a transparent titanium substrate 300, a silver titanium alloy layer 30. 2 is on the adhesion layer 304, and the protective layer 3 is on the silver-titanium alloy layer 302. 'The transparent substrate 300 is a glass substrate or a flexible substrate. In addition, there is a barrier. The layer 3 008 is located between the transparent substrate 300 and the adhesion layer 304, and is used to prevent alkali ions from entering the liquid crystal layer of the liquid crystal display so as not to deteriorate the liquid crystal. The material is, for example, silicon oxide (Si Ox); Sentence j Although the transparent substrate 300 is an alkali-free glass, this barrier layer Q η may not be required. ―Refer to Figure 3, the adhesion layer 304 is used to strengthen the force of the silver-titanium alloy layer yf η ~. Its material can be indium tin oxide (1 Τ0), and its film thickness is about ~ Angstrom 'is better. It is about 60 angstroms, and the protective layer 3 06 can be used to prevent the sulfur-titanium alloy layer 3 2 from being sulfurized in the environment to increase its storage.

10594twf1.ptc Page 10 594254-Case No. 92109866_Year Month Day Amendment __ 5. When explaining the invention (6), and considering its optical characteristics and protective effects, such as indium tin oxide (ITO) can be used Material, and its film thickness is about 40 ~ 1300 angstroms. The present invention can also achieve the requirements of total reflection and semi-reflection by controlling the thickness of the silver-titanium alloy layer 300. For example, when the reflection plate of the present invention is applied to a total reflection type liquid crystal display, the silver-titanium alloy layer 3 The thickness of 2 needs to be greater than 400 angstroms, preferably about 150 angstroms, and the protective layer 3 006 film on the silver-titanium alloy layer 302 is preferably about 40 angstroms; and when the present invention When the reflective plate is applied to a semi-reflective liquid crystal display, the thickness of the silver-titanium alloy layer 302 is between 100 and 400 angstroms, and the protective layer 3 06 is located on the silver-titanium alloy layer 3 0 2 It is preferably about 100 angstroms. The above reflection plate can also be applied to a liquid crystal display (LCD). As shown in FIG. 4, it is a schematic cross-sectional view of a liquid crystal display having the reflection plate shown in FIG. Please refer to FIG. 4. The liquid crystal display of the present invention includes at least an upper half 400, a lower half 41 °, and a liquid crystal layer 420 located between the upper half 400 and the lower half 41. The upper half 400 It includes an upper transparent substrate 402, an upper electrode layer 404 on the upper transparent substrate 402, and a first alignment film 406 on the upper electrode layer 404; and the lower half 41o is opposite to the upper half 40. The structure includes a lower transparent substrate 412, a silver-titanium alloy reflective stack 4 1 4 on the lower transparent substrate 412, an insulating layer 4 1 5 on the silver-titanium alloy reflective stack 4 J 4, and an insulating layer The lower electrode 4 1 β on 4 1 5 and a second alignment film 418 on the lower electrode 416. Please refer to FIG. 4. The silver-titanium alloy reflective stack 4 1 4 includes an adhesion layer 422, a silver alloy layer 424 on the adhesion layer 422, and a protective layer 426 on the silver-titanium alloy layer 424. In addition, there is a barrier layer

10594twf1.ptc Page 11 W4254 V. Description of the invention (7) Correction 4 0 8 is located under the reading wfa sub-entering liquid-between the substrate 412 and the adhesion layer 422 'to prevent the liquid crystal such as an oxygen trap Layer in order to avoid the deterioration of the liquid crystal, and its material is similar to that of the user. Among them, "the thickness of each layer in the Yinqin alloy reflective stack 414 can be referred to the conditions in Figure 3 above. The thickness i reaches Figure 4" The present invention can also control the Yinqin alloy layer 424 Apply the requirements of total reflection and semi-reflection; for example, when the present invention is larger than 400 angstroms, the thickness of the silver-silver alloy layer 4 2 4 requires only% & It is preferably about 15 0 0 angstroms' and is located in the silver-titanium alloy layer 4 2 4 Feng and She 2 4 2 6 film thickness is preferably about 40 angstroms; and when the present invention is applied to 100 to 4. 2 Λ display, The thickness of the Yin-Qin alloy layer 424 is approximately from the top to the right, and the thickness of the protective layer 4 2 6 on the silver-titanium alloy layer 4 2 4 is preferably about 100 angstroms. In addition, if this embodiment If it is a color liquid crystal display, please refer to FIG. 5 ′, which is a schematic cross-sectional view of a color liquid crystal display having a reflective plate shown in FIG. 3. Referring to FIG. 5, the color liquid crystal display of the present invention and the aforementioned The difference in Figure 4 is that the insulating layer 4 1 5 on the silver-titanium reflective stack 4 1 4 is configured with a color filter. (C〇l〇r fi lter) 50, which has the effect of electrically isolating the lower electrode layer 4 16 from the silver-titanium alloy reflective stack 4 1 4. The remaining layers are configured as shown in FIG. 4. Therefore, the present invention It is characterized by the use of a silver-titanium alloy reflective stack with a reflectivity of up to 95%, a low absorption rate of about 6%, and low cost as a reflective plate for a liquid crystal display, so that the liquid crystal display can also have a high reflectance and The advantage of low cost. In addition, the present invention can also achieve the full thickness by controlling the thickness of the silver titanium alloy layer in the silver titanium alloy reflection stack.

10594twfl.ptc Page 12 594254 _ Case No. 92109866 V. Description of the invention (8): The need to correct reflection and semi-reflection. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

10594twf1.ptc Page 13 594254 _Case No. 92109866_year month__ Brief description of the drawing Figure 1 is a schematic cross-sectional view of a traditional reflective plate of a liquid crystal display; Figure 2 is a drawing of a conventional liquid crystal display 3 is a schematic cross-sectional view of a reflective plate according to a preferred embodiment of the present invention; FIG. 4 is a schematic cross-sectional view of a liquid crystal display having a reflective plate shown in FIG. 3; and FIG. It is a schematic cross-sectional view of a color liquid crystal display having a reflecting plate shown in FIG. 3. 100, 200: glass substrate 1 02: alloy layer 1 04: protective layer of silicon dioxide (Si 02) 2 02: silver alloy layer 2 0 4: titanium dioxide (Ti02) adhesion layer 2 0 6 · Oxidation (I η 2 0 3) protective layers 300, 402, 412: transparent substrates 302, 424: silver-titanium alloy layer 3 0 4, 4 2 2: adhesion layer 3 0 6, 4 2 6: protective layer 3 0 8 4 0 8: barrier layer 4 0 0: upper half 4 1 0: lower half

10594twf1.ptc Page 14 594254 Case No. 92109866 Brief description of the modified diagram 414 415 404 406 420 Silver titanium alloy reflective laminated insulation layer 4 1 6: electrode layer 4 1 8: alignment film liquid crystal layer 5 0 0: color filter sheet

10594twf1.ptc Page 15

Claims (1)

594254 _Case No. 92109866_ Modifications of the month of the year _ 6. The scope of patent application 1. A reflective plate is formed on a transparent substrate, the reflective plate includes at least: an adhesion layer on the transparent substrate; a silver-titanium alloy A layer on the adhesion layer; and a protective layer on the silver-titanium alloy layer. 2. The reflecting plate according to item 1 of the scope of patent application, wherein the transparent substrate comprises one of a glass substrate and a flexible substrate. 3. The reflecting plate according to item 2 of the scope of patent application, further comprising a barrier layer between the adhesion layer and the transparent substrate. 4. The reflective plate according to item 3 of the scope of patent application, wherein the material of the barrier layer includes silicon oxide (Si Ox). 5. The reflecting plate according to item 1 of the scope of patent application, wherein the material of the adhesion layer comprises indium tin oxide. 6. The reflecting plate according to item 1 of the scope of patent application, wherein the film thickness of the adhesion layer is between 40 and 100 angstroms. 7. The reflective plate as described in item 1 of the scope of patent application, wherein the material of the protective layer includes indium tin oxide. 8. The reflecting plate according to item 1 of the scope of patent application, wherein the film thickness of the protective layer is between 40 and 1300 angstroms. 9. The reflecting plate according to item 1 of the scope of patent application, wherein the thickness of the silver-titanium alloy layer is greater than 400 Angstroms. 10. The reflecting plate according to item 1 of the scope of patent application, wherein the thickness of the silver-titanium alloy layer is between 100 and 400 Angstroms, so as to become a reflecting plate having a semi-transmissive and semi-reflective property. 10594twf1.ptc Page 16 594254 _ Case No. 92109866 _ month and year __ VI. Patent application scope 1 1. A liquid crystal display includes at least: an upper half, including: an upper transparent substrate; an upper electrode layer, located at On the upper transparent substrate; and a first alignment film on the electrode layer; the lower half, relative to the upper half, the structure includes: a lower transparent substrate; a silver-titanium alloy reflective stack on the lower transparent substrate The structure includes: an adhesion layer; a silver-titanium alloy layer on the adhesion layer; and a protective layer on the silver-titanium alloy layer; an insulating layer on the silver-titanium alloy reflective stack; An electrode layer is located on the insulating layer; a second alignment film is located on the lower electrode layer; and a liquid crystal layer is located between the upper half and the lower half. 1 2. The liquid crystal display according to item 11 of the scope of patent application, wherein the lower transparent substrate includes one of a glass substrate and a flexible substrate. 1 3. The liquid crystal display according to item 12 of the scope of patent application, further comprising a barrier layer between the adhesion layer and the transparent substrate. 14. The liquid crystal display according to item 13 of the scope of patent application, wherein the material of the barrier layer includes silicon oxide. 15. The liquid crystal display according to item 11 of the scope of patent application, wherein the material of the adhesion layer includes indium tin oxide. II 10594twf1.ptc Page 17 594254 _ Case No. 92109866_Year_Month__ Sixth, the scope of patent application 1 6. The liquid crystal display according to item 11 of the scope of patent application, wherein the film thickness of the adhesion layer is 40 ~ Between 100 Angstroms. 1 7. The liquid crystal display according to item 11 of the scope of patent application, wherein the material of the protective layer includes indium tin oxide. 1 8. The liquid crystal display according to item 11 of the scope of patent application, wherein the film thickness of the protective layer is between 40 and 130 angstroms. 19. The liquid crystal display according to item 11 of the scope of patent application, wherein the thickness of the silver-titanium alloy layer is greater than 400 angstroms. 20. The liquid crystal display according to item 11 of the scope of the patent application, wherein the thickness of the silver-titanium alloy layer is between 100 and 400 angstroms, so as to become a liquid crystal display with transflective and transflective properties. 2 1. The liquid crystal display according to item 11 of the scope of patent application, wherein the material of the insulating layer includes an acrylic resin material. 2 2. A color liquid crystal display including at least: an upper half including: an upper transparent substrate; an upper electrode layer on the upper transparent substrate; and a first alignment film on the electrode layer; The half part, relative to the upper half, has a structure including: a lower transparent substrate; a silver-titanium alloy reflective stack on the lower transparent substrate; the structure includes: an adhesion layer; a silver-titanium alloy layer on the adhesion layer On; and 10594twf1.ptc Page 18 594254 _ Case No. 92109866_Year__ Sixth, the scope of the patent application is a protective layer on the silver-titanium alloy layer; a color filter on the silver-titanium alloy reflective stack; The lower electrode layer is located on the color filter; a second alignment film is located on the lower electrode layer; and a liquid crystal layer is located between the upper half and the lower half. 2 3. The color liquid crystal display according to item 22 of the scope of patent application, wherein the lower transparent substrate includes one of a glass substrate and a flexible substrate. 2 4. The color liquid crystal display according to item 23 of the scope of patent application, further comprising a barrier layer between the adhesion layer and the transparent substrate. 25. The color liquid crystal display according to item 24 of the scope of patent application, wherein the material of the barrier layer includes silicon oxide. 26. The color liquid crystal display according to item 22 of the scope of patent application, wherein the material of the adhesion layer includes indium tin oxide. 27. The color liquid crystal display according to item 22 of the scope of patent application, wherein the film thickness of the adhesion layer is between 40 and 100 angstroms. 2 8. The color liquid crystal display according to item 22 of the scope of patent application, wherein the material of the protective layer includes indium tin oxide. 29. The color liquid crystal display according to item 22 of the scope of patent application, wherein the film thickness of the protective layer is between 40 and 130 angstroms. 30. The color liquid crystal display according to item 22 of the scope of patent application, wherein the thickness of the silver-titanium alloy layer is greater than 400 angstroms. 31. The color liquid crystal display according to item 22 of the scope of the patent application, wherein the thickness of the silver-titanium alloy layer is between 100 and 400 angstroms, so as to become a liquid crystal display with semi-transmissive and semi-reflective characteristics. . 10594twf1.ptc Page 19