TW587238B - Transflective display - Google Patents

Abstract

A transflective display includes an upper substrate, a lower substrate and a liquid crystal layer. A reflective electrode layer is formed on the lower substrate for use as a reflective area of a pixel electrode. A first polarizer plate is formed on the outer surface of the upper substrate. A second polarizer plate is formed on the outer surface of the lower substrate. An optical compensation plate is formed between the second polarizer plate and the lower substrate. The optical compensation plate is a half-wave plate capable of making the incident light generate lambda/2 phase difference, and an included angle of 45 DEG is provided between the short axis of the optical compensation plate and the transmissive axis (or absorbing axis) of the second polarizer plate.

Description

587238 V. Description of the invention (1) The technical field to which the invention belongs: The present invention relates to the optical properties of a type of semi-reflective and translucent liquid crystal display that is semi-transparent and translucent, and particularly related to less thickness, improved viewing angle limitation, and improved light ; Structure can reduce the previous technology: the image will be faded and the contrast will be reduced. Compared with ^ :, bu ”J (reflective) display relies on external light sources to display _ so it will appear in outdoor and under strong light Outstanding J: effect, which can reduce the timing and contrast of the backlight that consumes a lot of power, and is printed on portable production. However, reflective displays are more difficult to achieve high contrast and high color quality images, especially in full color m ί When the ambient light source ..., the contrast of the reflective display is large: discount, so if you can use the transflective technology of the auxiliary backlight to reflect the transflective display, the advantages of the wearable + type and reflective type are applicable. For active driving technologies such as thin film transistor (amorphous TFT) or low temperature polycrystalline silicon thin film transistor (10w 1 polysilicon TFT), the current Ure products This type of semi-reflective and semi-transmissive display panel is used. Please refer to Figure 1 for a picture of the semi-reflective semi-fluid device. A semi-reflective and transflective liquid crystal display is shown on the substrate. The substrate 14 and a liquid crystal layer 16. On the inner surface of the upper = 3, that is, on the surface facing the liquid crystal layer 〖6, it includes two plates 12 and a shape filter 077-89l6TWF (Nl); P91106; cherry. ptd Page 5 587238 V. Description of the invention (2) A light layer (not shown in the figure) and a common electrode layer 18. A first 1/4 wave plate is sequentially arranged on the outer surface of the upper substrate 12 ( qUarter-wave plate 'hereinafter referred to as qwp) 20I, a first half-wave plate (half-wave

Plate (hereinafter referred to as HWP) 22I and a first polarizer 241. The first HWP 221 can generate a λ / 2 phase difference of incident light, and the first QWP 201 can generate an incident light; ^ / 4 phase difference.

A transparent electrode layer 26, a protective layer 28, and a reflective electrode layer 30 are sequentially formed on the inner surface of the lower substrate 14, that is, the surface facing the liquid crystal layer M. One of the openings 29 penetrates the protective layer 28. And the central area of the reflective electrode layer 30, the exposed area of the transparent electrode layer 26 becomes the transmissive area T of the day electrode, and the covered area of the reflective electrode layer 30 becomes the reflective area R of the day electrode. A second QWP 2011, a second HWP 2211, and a second QTO 2411 are sequentially arranged on the outer surface of the lower substrate 1-4. The second HWP 2211 can make a λ / 2 phase difference of incident light, and the second QWP 20 11 can make a λ / 2 phase difference of incident light. In addition, the semi-reflective and transflective liquid crystal display 10 includes a backlight device 32, which is disposed below the second polarizing plate 2411. °

The electrical operation of the semi-reflective and transflective liquid crystal display 10 is as follows. In the reflection mode, the incident light provided by the external environment is reflected toward the upper substrate i 2 through the counter electrode layer 30 (the reflection region R of the day element electrode), and is provided to the reflection by a switching element (such as a TFT element). The telecommunication signal of the electrode layer 30 will change the arrangement of the liquid crystal molecules of the liquid crystal layer 6 and the above-mentioned reflected light will pass through the color filter layer of the upper substrate 2 and appear as * color light. 32 穿透 in backlight mode

0773-8916TWF (Nl); P91106; cherry.ptd Page 6 587238 V. Description of the invention (3) · The light will pass through the opening 29 and penetrate the electrode layer 26 (the penetrating region T of the day element electrode). A telecommunication signal provided by a switching element (eg, a TFT element) to the penetrating electrode layer 26 will change the arrangement of liquid crystal molecules in the liquid crystal layer 6 and the above penetrating light will pass through the liquid crystal layer 6 and the upper substrate 2 The color filter layer is then presented as colored light.

The purpose of setting the first QWP 201 and the first HWP 221 on the upper substrate 12 and the second QWp 2011 and the second HWP 2211 on the lower substrate 14 is to provide a phase retardation plate. The optical compensation effect (broad-wavelength band) can be enlarged. Moreover, in a daylight region, two thickness regions are formed in the liquid crystal layer 16 so that the phase retardation of the penetrating region T is twice that of the reflection region r. Because the phase difference between the transmissive region T and the reflective region R is different and the phase delay plate cannot achieve accurate compensation, we must consider reducing the thickness of the unit cell of the semi-reflective liquid crystal display 10. It is also necessary to consider reducing the thickness of the phase retardation plate (including QWP 201, 2011 and HWP 221, 2211). In addition, 'the upper substrate 12 and the lower substrate 14 are respectively provided with the first q w p 201 and the second QWP 2011, which will limit the viewing angle τ of the penetrating region τ (viewing n g 1 e)'. Therefore, the problem of insufficient viewing angle remains to be solved.

In addition, for the light recycling between the backlight device 32 and the reflection area r, the optical architectures of qwp 201, 20 I I, and HWP 22 I, 22 11 also need to be considered. Please refer to FIG. 2, which is a schematic cross-sectional view showing the light reuse rate between the backlight device 32 and the reflection region R. When the backlight device 32 provides a first incident light 33,

0773-8916TWF (Nl); P91106; cherry.ptd Page 7 587238 V. Description of the invention (4) After the substrate 14 penetrates the second HWP 2211 and the second Qwp 2〇π, it will become a weaker second incident The light 34 passes through the reflective electrode layer 30, and the light transmitted through the reflective electrode layer 30 at this time can be regarded as a reflective plate and generates a first reflected light 35 ', but when the first reflected light 35 passes through the second QWp 2o After π, the second HWP 2211 and the second polarizing plate 24π will become a weaker second reflected light 3 6. Therefore, for the light reflection effect between the backlight device 32 and the reflection area r, the incident light and the reflected light pass through the first QWP 2011 and the second HWP 2211 a total of two times, and most of the light will be absorbed. ^ 'Make the second reflected light 36 which is finally reflected back to the backlight device 32

Becomes extremely weak, making it almost impossible to recycle light. Therefore, it is known that the semi-reflective and transflective liquid crystal display 10 will have a problem of insufficient brightness. It is necessary to consume power to increase the brightness of the backlight device 32 in order to improve the problem of poor light quality. SUMMARY OF THE INVENTION Reflection semi-reduced, thin, and semi-reflective transflective display quality 0 kinds of semi-reflective transflective display reutilization 0 kinds of semi-reflective transflective display liquid crystal display light in view of this' One of the inventions The purpose is to penetrate the optical plate structure of the display, which can meet the requirements of cost reduction. ^ ^% ΊΊ 一一

The optical plate structure of the camera can achieve the display quality of wide viewing angle. Mouth 丨 / Baqiao's optical plate structure can improve the recycling rate of light

〇773-8916TW (Nl); P9u〇6; cherry > ptd

587238 V. Description of the invention (5) Degree and resolution. The radio field is displayed. The first system type is, compensating board, cool and crying, as described above. The present invention provides a kind of semi-reflective half-mouth. An upper substrate, a lower substrate, and a liquid crystal layer are included. A polar layer is formed on the lower substrate, as a gold reflector, a cage, and a polarizer of the reflective region of the normal electrode is formed on the outer surface of the upper substrate and one on the outer surface of the lower substrate. And-optical compensation: Chengdi II polarizer and the lower substrate. The light-wave plate can make the incident light λ / 2 phase difference, and the =: the button axis system and the transmission axis (or absorption axis: supplementary angle 0) of the second polarizer. The reference device has an upper surface and an inner surface filter layer 4 7 placed first above and below, and an electrode layer 5 6 in order allows the above and other objects, features, and advantages of the present invention to be mentioned below. The examples are implemented, and with the accompanying drawings, as follows: ^ The third elevation, which shows the semi-reflective and semi-transparent liquid of the present invention :: Situation. The semi-reflective and semi-transmissive liquid crystal display 40 packs 2 and 1 The substrate 44 and a liquid crystal layer 46. On the upper surface, that is, on the surface facing the liquid crystal layer 46, the common electrode layer 48 is included. On the upper substrate 42: a polarizer 5 () I. On the inner surface of the substrate 44, that is, the surface facing the liquid crystal layer 46, there is formed a transparent electrode layer 52, a protective layer 54, and -inversely, the area covered by the reflective electrode layer 56 becomes a day electrode.

f 厶 五 5. Description of the invention (6) Reflective region R, and transparent electrode penetrating region T. The exposed area of Yu / ㈢54 is a pixel electro-optical compensation plate 58 and the outer surface of the 〃base-plate 54. The purpose of setting a school compensation plate 58 in order is the first plate, the light plate 5011. In the wide wavelength band where the light is provided in the lower substrate 44, it can be provided as a phase retardation plate. In the photon region, the optical compensation < = optical compensation effect. Moreover, the complement of the phase retardation in a daytime region R accurately achieves the penetration region T and the reflection region. The liquid crystal display 40 includes ^ / 丄. Beyond that, the 'semi-reflective and transflective' plate 5011 is below. The one-month light source device 60, which is set on the second polarized, semi-reflective and translucent liquid crystal display 40, is electrically dropped as described by Fang 彳 & In the reflection mode, the external reflection is performed in the following manner: f ^ 56 (t ^ f ^ ^ t Μ ώ ^ Reflect, the same as 砗 Α η μ, the radiation area 1 ^, and faces the upper substrate 42. The direction f shot is provided by a switching element (eg, a TFT element) to the reflection device. = = The arrangement of the liquid crystal molecules in the liquid crystal layer 46 is changed. = The light passes through the colored light layer 47 on the upper substrate 42 so that the light can pass through. : Book ί Electricity: = H = Device 60, as mentioned, — The electrode penetrates the area of the I electrode, and is provided by the switching element (such as a TFT element) to the penetrating electrode layer 52 (through the electrode element). The telecommunication signals in the transparent area T) will change the arrangement of the liquid crystal molecules y of the liquid crystal layer 46. The above-mentioned penetrating light will pass through the liquid crystal layer 46 and the upper substrate 42, and the light layer 47 will be presented as colored light. From the above, it can be known that the optical plate structure of the semi-reflective and transflective liquid crystal display of the present invention includes a first polarizing plate 50m, an optical patch 58 and a second polarizing plate 5011. The preferred one is , Optical compensation plate 58 series is one

0773-8916TWF (Nl); P91106; cherry.ptd Page 10 587238 V. Description of the invention (7) Half wave plate (HWP) can make the incident light produce a λ / 2 phase difference, while the first polarizing plate 5 Ο I is worn The transmission axis (or absorption axis) is perpendicular to the transmission axis (or absorption axis) of the second polarizing plate μ II, and the short axis of the optical compensation plate 58 and the transmission axis (or absorption axis) of the second polarizing plate 50Π Was 45. Angle. The twist angle of the liquid crystal molecules in the liquid crystal layer 46 is zero. ~ 5 〇. . The present invention does not limit the pattern arrangement of the transparent electrode layer 52, the protective layer 54, and the reflective electrode layer 56, and the design of the full-scale area of the liquid crystal layer 46.

In addition, the optical plate structure provided by the present invention can effectively improve the light reuse rate between the moon light source device 60 and the reflection area R. Please refer to FIG. 4, which is a schematic cross-sectional view showing the reuse rate of light between the backlight device 60 and the reflection area r. When the backlight device 60 provides an incident light 6 2 to the reflective electrode layer 56 through the lower substrate 44, the reflective electrode layer 5 6 at this time can be regarded as a reflective plate and generates a reflected light 6 4 and then reflects the light. 64 will be recycled through the optical compensation plate 58 and the second polarizing plate 50i. For the light reflection effect between the moon light source device 60 and the reflection area R, the optical compensation plate 58 through which the incident light 62 and the reflected light 64 pass a total of two times is compared with the conventional technology which allows the light to pass twice Qwp and two Time? According to the present invention, only one layer of the optical compensation plate 58 is provided, which can effectively reduce the absorption rate of light 'and further improve the recycling and reuse of light. Therefore, the optical plate structure of the present invention can increase the brightness of the semi-reflective and transflective liquid crystal display 40 without additional power consumption. Compared with the conventional technology, the optical plate structure provided by the present invention is provided with a layer of polarizing plate 50m only on the outer surface of the upper substrate 42 and an optical compensation plate 58 and a layer only on the outer surface of the lower substrate 44. Polarizing plate 5 〇 丨 丨, so

587238

587238 Brief Description of Drawings Figure 1 shows a schematic cross-sectional view of a conventional transflective liquid crystal display. FIG. 2 is a schematic cross-sectional view showing a light reuse rate between a conventional backlight device and a reflective area. Fig. 3 is a schematic cross-sectional view of a semi-reflective and transflective liquid crystal display of the present invention. Fig. 4 is a schematic cross-sectional view showing the reutilization rate of light between the backlight device and the reflection area of the present invention. _ Explanation of symbols 习 Known technology shot f Semi-reflective and transflective liquid crystal display ~ 10, upper substrate ~ 12; liquid crystal layer ~ 16; transparent electrode layer ~ 2 6; protective layer ~ 2 8; penetration area ~ T; first QWP ~ 201; first polarizing plate ~ 241; second HWP ~ 2211; backlight device ~ 3 2; second incident light ~ 3 4; second reflected light ~ 36. Lower substrate ~ 1 4; Common electrode layer ~ 18; Reflective electrode layer ~ 30; Opening ~ 29; Reflective area ~ R; First HWP ~ 221; Second QWP ~ 201 I; Second polarizing plate ~ 241 I One incident light ~ 3 3 First reflected light ~ 3 5

0773-8916TWF (Nl); P91106; cherry.ptd Page 13 587238 The diagram briefly illustrates the technology of the present invention: semi-reflective and transflective liquid crystal display ~ 4 0 upper substrate ~ 4 2; liquid crystal layer ~ 4 6; common electrode layer ~ 4 8; protective layer ~ 5 4; reflective area ~ R; first polarizing plate ~ 501 optical compensation plate ~ 58; incident light ~ 6 2; lower substrate ~ 4 4; color filter layer ~ 4 7; transparent electrode layer ~ 5 2; reflective electrode layer ~ 5 6; penetrating area ~ T; second polarizing plate ~ 5011 backlight device ~ 6 0; reflected light ~ 6 4. _ ❿

0773-8916TWF (Nl); P91106; cherry.ptd Page 14

Claims (1)

587238 6. Scope of patent application1. A semi-reflective and transflective display, comprising: an upper substrate and a lower substrate;-a liquid crystal layer formed on a gap formed by the inner surface of the upper substrate and the inner surface of the lower substrate; A reflective electrode layer is formed on the lower substrate and serves as a reflective region of a day electrode; a ^ Φ transparent electrode layer is formed on the lower substrate, and is not formed by the reflective electrode layer The covered area is a penetrating area of a day electrode, a first polarizing plate is formed on the outer surface of the upper substrate; A second polarizing plate is formed on the outer surface of the lower substrate; and an optical compensation plate is formed between the second polarizing plate and the lower substrate. That is, the semi-reflective transflective display as described in item 1 of the scope of the patent application, further comprising a backlight device, which is disposed below the second polarizing plate. ^ 3 The semi-reflective and transflective display as described in item 1 of the scope of the patent application, wherein the optical compensation plate is a half-wave plate (HWP), which can cause a λ / 2 phase difference at the incident line. 4. Semi-reflective transflective display as described in item 1 of the scope of patent application It is preferable that the transmission axis of the first polarizing plate is perpendicular to the second polarization transmission axis. 5. The semi-reflective transflective display according to item 1 of the scope of the patent application, wherein the short axis of the optical compensation plate and the second polarizing plate have a transmission or absorption axis of 45. Angle. 587238 6. Scope of patent application 6. The semi-reflective and transflective display device described in item 1 of the scope of patent application. The twist angle of the liquid crystal molecules of the liquid crystal layer is 0 ° ~ 50 °. 7. The semi-reflective transflective display as described in item 1 of the patent application scope further includes a color filter layer formed on the upper substrate. Table 8. The semi-reflective transflective as described in item 1 of the patent application scope The penetration display further includes a common electrode layer formed on the inner surface of the upper substrate _ 0773-8916TWF (Nl); P91106; cherry.ptd Page 16