TW200422719A - Reflector and transflective LCD - Google Patents

Abstract

A reflector and a transflective LCD are provided. The reflector comprises an adhesion layer, an AGX layer and a protection layer is form on a transparent substrate. The AGX layer is formed on the adhesion layer, and the protection layer is formed on the AGX layer. In addition, openings are formed in the AGX layer and the protection layer of the AGX stacked structure for a requirement of transflective display. Due to the high reflectivity and the low cost of the AGX layer, the LCDs using the reflector of present invention also have the advantage of high reflectivity and low cost.

Description

200422719 V. Description of the invention (1) The technical field to which the invention belongs The present invention relates to a reflective plate structure of a liquid crystal display (1 i Q uidcrysta 1 disp 1 ay, referred to as LCD), and in particular to a semi-transparent and semi-reflective Structure of a silver-titanium alloy (AGX) reflective plate of a trans-flective liquid crystal display. Prior technologies In recent years, the development of liquid crystal displays has become more widely used and integrated with electronic components in combination with electronic components. However, the production of relative 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 More than 60% of the power of the LCD display is dropped, so when designing portable products such as mobile phones, personal digital assistants (PDAs) and e-books, we must find new power-saving technologies to solve them. Its high power consumption. Therefore, in recent years, reflection type liquid crystal displays using external light sources have gradually received the attention of various parties, which can greatly improve the problem of high power consumption of liquid crystal displays. Taking a twisted nematic (T N) or super twisted nematic (S T N) reflective liquid crystal display as an example, it is mainly plated on the lower substrate of a liquid crystal panel.

; 3ii96twf. Ptd page 5 200422719 V. Description of the invention (2) One-layer reflecting plate 'This reflecting plate has the function of reflecting the external light source. When the external light is sufficient, its display quality is good. It can be seen that the reflective & liquid crystal display does not require a backlight module to achieve the display purpose, and its power consumption is greatly reduced. However, if an appropriate light source is not provided, such as a front light source, the reflective liquid crystal display cannot be used in an environment with weak external light. The transflective and semi-reflective liquid crystal display can be regarded as the integrated structure of the transmissive liquid crystal display and the reflective liquid crystal display. It not only has the advantage of low power consumption, but also can be used in the environment with weak external light. The transflective liquid crystal display has been widely used in various portable products. As shown in FIG. 1, a schematic cross-sectional view of a reflective plate of a conventional reflective liquid crystal display is shown. Referring to FIG. 1 ', the reflection plate of the liquid crystal display is formed on a glass substrate 100, and is composed of a aluminum alloy layer 102 and a layer between the glass substrate 100 and the aluminum alloy layer 102. It is composed of a silicon dioxide (Si 02) protection layer 104. Stomach, however, the traditional use of Shao alloys such as A 1 N d, ACX as reflective materials has the following disadvantages, including reflectance of about 89%, high absorption of about 15%, poor hardness, and very sensitive to alkaline substances, etc. Therefore, there is another reflection plate of a reflective liquid crystal display, as 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, the glass substrate 200 and the silver alloy layer 202. between

〇 £ 〇 £ 96twf. Ptd Page 6 200422719 V. A layer of the invention description (3) < Ti02 Adherent layer 204 and a layer of indium oxide (In203) on the silver alloy layer 202 It is composed of a protection layer 206. Although the current use of silver alloys such as AP and APC as reflective materials can increase reflectance and reduce absorption, it is necessary to add about 2% of the precious metal palladium (pal lad ium, chemical formula) to the target for the silver alloy layer. It is Pd), so its production cost will be higher than that of reflectors that generally use Ming alloy, resulting in low competitiveness. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a reflection plate for a liquid crystal display to increase the reflectance and decrease the absorbance. Another object of the present invention is to provide a reflector for a liquid crystal display, so as to reduce the manufacturing cost of the reflector and make it competitive. Another object of the present invention is to provide a reflection plate for a liquid crystal display, which can be applied to a total reflection and a semi-reflective liquid crystal display. According to the foregoing and other objects, the present invention provides a reflective plate for a liquid crystal display, which is formed on a transparent substrate and is composed of at least an adhesion layer, a silver-titanium alloy layer, and a protective layer. Among them, the adhesion layer is on the transparent substrate, the silver-titanium alloy layer is on the adhesion layer, and the protective layer is on the silver-titanium alloy layer. Because silver-titanium alloys that have been used in a large number of CD-R (cmpae1: disk-recordable, CD-R) industries have high reflectance (> 9 5%) and low light absorption, and The production cost is lower than that of the silver alloy used in the reflective plate of the liquid crystal display, so it can replace the conventional I-Lu alloy or silver alloy. Moreover, it can be matched with the structure and optical design.

-Wl96twf. Ptd Page 7 200422719 V. Description of the Invention (4) Control the thickness of the silver-titanium alloy film and the characteristics of its protective layer to make a reflective plate for a total reflection or semi-reflective liquid crystal display. The present invention further provides a 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, an upper electrode layer on the upper transparent substrate, and a first alignment film on the electrode layer. The lower half is opposite to the upper half in structure and includes a lower transparent substrate, A silver-titanium alloy reflective stack on the lower transparent substrate, 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. In addition, the silver-titanium alloy reflective stack includes an adhesion layer, a silver-tin alloy layer on the adhesion layer, and a protective layer on the silver-titanium alloy layer. The present invention further provides a 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, an upper electrode layer on the upper transparent substrate, and a first alignment film on the electrode layer. The lower half is opposite to the upper half in structure and includes a lower transparent substrate, A silver-titanium alloy reflective stack on the lower transparent substrate, a color filter on the silver-titanium alloy reflective stack, a lower electrode layer on the color filter, and a second alignment on the lower electrode layer membrane. In addition, the silver-titanium alloy reflective stack includes an adhesion layer, a silver-rhenium alloy layer on the adhesion layer, and a protective layer on the silver-titanium alloy layer. According to the invention, the silver-titanium alloy layer and the protective layer in the silver-titanium alloy reflective stack form an opening to meet the requirements of semi-transmission and semi-reflection.

flMS6twf. ptd Page 8 200422719 V. Description of the invention (5) ^ ------ The present invention is because of the silver ^ ＋+ shooting helmet, your Ώ ... m 敎 alloy reflective stack has up to 95% of the reflective stack. The advantages of semi-transparent-half-W books 'so adopt Yinqin alloy ancient ancient g & & t, long reflection LCD display, its reflection area has handle Z system you two t' this semi-transparent-semi-reflective The reflective plate of the liquid crystal display has the advantage of low cost in manufacturing. Obviously, the description and other objectives, features, and advantages of the present invention can be further improved. The following is a detailed description of the preferred embodiment and the accompanying drawings, which are described in detail as follows: Embodiment 1 Figure 3 It is a sectional view of a reflecting plate according to a preferred embodiment of the present invention. Referring to FIG. 3, the reflective plate of the present invention is formed on a transparent substrate 300 'and at least consists of an adhesive layer (adherent! Ayer) 304, a silver titanium alloy (AGX) layer 302, and a protection layer (protection) layer) 3 0 6. The adhesion layer 300 is located on the transparent substrate 300, the silver-titanium alloy layer 300 is located on the adhesion layer 300, and the protective layer 3 06 is located on the silver-titanium alloy layer 300, which is transparent The substrate 3 is, for example, a glass substrate or a flexible substrate. In addition, a barrier layer 308 is located between the transparent substrate 300 and the adhesion layer 304. It is used to prevent alkali ions from entering the liquid crystal layer of the liquid crystal display to avoid the deterioration of the liquid crystal. The material is, for example, silicon oxide (S i OX); In other words, when the transparent substrate 300 is an alkali-free glass, this barrier layer 308 may not be needed. Please continue to refer to FIG. 3. The adhesion layer 304 is used to strengthen the adhesion between the silver-titanium alloy layer 302 and the barrier layer 308 or the transparent substrate 300. The material is, for example, indium tin oxide (I TO), and Its film thickness is, for example, between 40 and 100 angstroms.

lft®4twf. ptd page 9 200422719 5. Description of the invention (6), and preferably about 60 angstroms. The protective layer 3 06 can be used to prevent the vulcanization of the silver-titanium alloy layer 3 2 in the environment, in order to increase its storage time, and its optical characteristics and protective effects must be considered, so this embodiment uses indium tin oxide (IT 0) and other transparent materials, and the film thickness of the protective layer 3 6 is, for example, between 40 and 130 angstroms. In addition, in this embodiment, the thickness of the silver-titanium alloy layer 300 is, for example, greater than 500 angstroms, and the preferred thickness thereof is, for example, about 150 angstroms. The above-mentioned reflecting plate is applied to, for example, a liquid crystal display (LCD), and FIG. 4 is a schematic cross-sectional view of a transflective-transflective liquid crystal display having the reflecting plate shown in FIG. 3. Please refer to FIG. 4. The liquid crystal display of the present invention includes at least an upper half 400, a lower half 410, and a liquid crystal layer 4 2 0 between the upper half 400 and the lower half 410. The upper half 4 0 0 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 410 is opposite to the upper half 402. Its structure includes a lower transparent substrate 4 1 2, a silver-titanium alloy reflective stack 414 on the lower transparent substrate 412, an insulating layer 4 1 5 on the silver-titanium alloy reflective stack 4 1 4, and an insulating layer 4 The lower electrode 41 6 on the upper electrode 15 and a second alignment film 41 8 on the lower electrode 4 16. Please refer to FIG. 4. The silver-titanium alloy reflective stack 4 1 4 includes an adhesion layer 422, a silver-titanium 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 428 between the lower transparent substrate 412 and the adhesion layer 422, which is used to prevent alkali ions from entering the liquid crystal layer of the liquid crystal display to avoid the deterioration of the liquid crystal.

Job wf.ptd Page 10 200422719 V. Description of the invention (7) The material is, for example, silicon oxide. Among them, the material and thickness range of each layer in the silver-titanium alloy reflective stack 4 1 4 can refer to the conditions in the aforementioned third figure. In addition, if this embodiment is a full-color liquid crystal display, a color filter 430 ° may be disposed between the lower electrode layer 4 1 6 and the silver-titanium alloy reflective stack 4 1 4. Please refer to In FIG. 4, in order to make the reflective plate have the characteristics of semi-transmission and semi-reflection, this embodiment is formed in the silver-titanium alloy layer 424 and the protective layer 426 in the silver-titanium alloy reflective stack 4 1 4 to form an opening 414 a. In a single pixel, this opening 4 1 4 a will allow the light provided by the backlight module (not shown) to pass through, while the silver titanium alloy layer 4 2 4 in the silver titanium alloy reflection stack 4 1 4 may Effectively reflect external light source or front light source out of the LCD panel. In addition, if this embodiment is a color liquid crystal display, please refer to FIG. 5, which is a schematic drawing showing a cross section of a color liquid crystal having a reflecting plate as shown in FIG. Please refer to FIG. 5. The difference between the color liquid crystal display of the present invention and the previous FIG. 4 is that the insulating layer 415 on the silver-titanium alloy reflective stack 4 1 4 is replaced with a color filter 500. It has the function of electrically isolating the lower electrode layer 4 1 6 and the silver-titanium alloy reflective stack 4 1 4. The remaining layers are configured as shown in Figure 4. Therefore, the present invention is characterized in that a silver-titanium alloy reflective laminate having the advantages of up to 95% reflectance, low absorption, and low cost is used as a reflective plate of a liquid crystal display, and a half penetration is achieved through an opening on the reflective plate. The effect of transflective-semi-reflective, so the present invention can make the reflective area of the transflective-semi-reflective liquid crystal display have a high reflectivity and have a reflective plate system.

Fp5g6twf. Ptd page 11 200422719 V. Description of the invention (8) The advantage of low cost. 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 as β.

Enter! 6twf.ptd Page 12 200422719 Brief description of the drawings Figure 1 is a schematic cross-sectional view of a conventional reflective plate of a liquid crystal display; Figure 2 is a cross-sectional schematic view of a conventional reflective plate of a liquid crystal display; FIG. 4 is a schematic cross-sectional view of a reflective plate according to a preferred embodiment of the present invention; and FIGS. 4 and 5 are schematic cross-sectional views of a transflective-transflective liquid crystal display having a reflective plate shown in FIG. 3. 100, 200: glass substrate 102: aluminum alloy layer 104: silicon dioxide (Si02) protective layer 2 02: silver alloy layer 204: titanium dioxide (Ti02) adhesion layer 2 0 6 ·· Indium oxide (I η 2 0 3) protective layers 300, 402, 412: transparent substrates 302, 424: silver-titanium alloy layers 3 0 4, 4 2 2: adhesion layers 3 0 6, 4 2 6: protective layers 308 428: barrier layer 4 0 0: upper half 4 1 0: lower half 4 1 4: silver-titanium alloy reflective stack 4 1 4 a: opening

M ^ twf. Ptd Page 13 200422719 Brief description of the drawings 415 404 406 420 430 Insulating layer 4 1 6: Electrode layer 4 1 8: Alignment film Liquid crystal layer Color filter

aS96twf.ptd Page 14

Claims (1)

200422719 6. Scope of patent application 1. A reflecting plate formed on a transparent substrate, the reflecting plate includes at least: an adhesion layer on the transparent substrate; a silver-titanium alloy layer on the adhesion layer; and a A protective layer is located on the silver-titanium alloy layer. 2. The reflecting plate according to item 1 of the scope of patent application, wherein the transparent substrate includes 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 reflecting plate according to item 3 of the scope of patent application, wherein the material of the barrier layer includes silicon oxide (Si 0X). 5. The reflecting plate according to item 1 of the scope of patent application, wherein the material of the adhesion layer includes indium tin oxide (I T0). 6. The reflector 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 reflecting plate according to item 1 of the scope of patent application, wherein the material of the protective layer comprises 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 500 angstroms. 10. A transflective-semi-reflective liquid crystal display, including at least: an upper half, including: a transparent substrate; l®5S6twf. ptd Page 15 200422719 VI. Patent application scope-an upper electrode layer on the upper transparent substrate; and a first alignment film on the electrode layer; the lower half, relative to the upper half, Its structure includes: a lower transparent substrate; a silver-titanium alloy reflective laminate on the lower transparent substrate, and its structure includes: an adhesion layer; a silver-titanium alloy layer on the adhesion layer, and the silver-titanium alloy layer has a plurality of Openings; and a protective layer on the silver-titanium alloy layer; an insulating layer on the silver-titanium alloy reflective stack; a lower electrode layer on the insulating layer; a second alignment film on the lower electrode On the layer; and a liquid crystal layer between the upper half and the lower half. 1 1. The transflective-semi-reflective liquid crystal display according to item 10 of the scope of patent application, wherein the lower transparent substrate includes one of a glass substrate and a flexible substrate. 12. The transflective-semi-reflective liquid crystal display according to item 11 of the scope of patent application, further comprising a barrier layer between the adhesion layer and the transparent substrate. 1 3 · The transflective-semi-reflective liquid crystal display as described in item 12 of the scope of patent application, wherein the material of the barrier layer includes silicon oxide. l & Mtwf. ptd page 16 200422719 VI. Application for patent scope 1 4. For example, the patent application scope No. 1 liquid crystal display, where the adhesion layer 15. As for patent application scope No. 1 liquid crystal display, where the adhesion layer 16. Patent application No. 1 liquid crystal display, where the protective layer 1 7. Such as patent application No. 1 liquid crystal display, where the protective layer 1 8. Such as patent application No. 1 liquid crystal display, where the silver-titanium alloy 1 9 The scope of the patent is the first liquid crystal display, wherein the insulating layer is used. 20. A kind of semi-transparent-semi-reflective upper half, including: an upper transparent substrate; an upper electrode layer, located in a first alignment film, positioned at a lower half, opposite to the upper and lower transparent substrate; a silver titanium The semi-transmissive-semi-reflective materials described in the alloy reflection stack item 0 include indium tin oxide. The thickness of the transflective-semi-reflective film described in item 〇 is between 40 and 100 angstroms. The semi-transmissive-semi-reflective materials described in item 0 include indium tin oxide. The transflective-semi-reflective film thickness described in item 〇 is between 40 and 130 angstroms. The thickness of the semi-transmissive-semi-reflective gold layer described in item 0 is greater than 500 Angstroms. The semi-transmissive-semi-reflective materials described in item 〇 include acrylic resin-type liquid crystal displays, including at least: the upper transparent substrate; and on the electrode layer; the half, whose structure includes: a layer, It is located on the lower transparent substrate, and its structure includes an adhesion layer domain 鄕 twf · ptd page 17 200422719 6. Patent application scope A silver titanium alloy layer is located on the adhesion layer, and the silver alloy layer has a plurality of openings; and A protective layer on the silver-titanium alloy layer; a color phosphor plate on the silver-titanium alloy reflection stack; a lower electrode layer on the color filter; a second alignment film on the lower electrode layer Upper; and a liquid crystal layer between the upper half and the lower half. 2 1. The transflective-semi-reflective liquid crystal display according to item 20 of the scope of patent application, wherein the lower transparent substrate includes one of a glass substrate and a flexible substrate. 2 2. The transflective-semi-reflective liquid crystal display according to item 21 of the scope of patent application, further comprising a barrier layer between the adhesion layer and the transparent substrate. 2 3. The transflective-semi-reflective liquid crystal display according to item 22 of the scope of patent application, wherein the material of the barrier layer includes silicon oxide. 24. The transflective-semi-reflective liquid crystal display as described in item 20 of the scope of patent application, wherein the material of the adhesion layer includes indium tin oxide. 2 5. The transflective-semi-reflective liquid crystal display according to item 20 of the scope of patent application, wherein the film thickness of the adhesion layer is between 40 and 100 angstroms. 26. The transflective-semi-reflective liquid crystal display as described in item 20 of the scope of patent application, wherein the material of the protective layer includes indium tin oxide. 2 7. The transflective-semi-reflective liquid crystal display according to item 20 of the scope of patent application, wherein the film thickness of the protective layer is between 40 and 130 angstroms. lMSBtwf. ptd Page 18 200422719 VI. Application for patent scope 2 8. The transflective-semi-reflective liquid crystal display as described in item 20 of the patent application scope, wherein the thickness of the silver-titanium alloy layer is greater than 500 Angstroms. 10596itwf. Ptd yj J ^ page 19