CN1167972C

CN1167972C - Liquid crystal display device with a light guide plate

Info

Publication number: CN1167972C
Application number: CNB021023700A
Authority: CN
Inventors: 韦忠光
Original assignee: Chi Mei Optoelectronics Corp
Current assignee: Chi Mei Optoelectronics Corp
Priority date: 2002-01-22
Filing date: 2002-01-22
Publication date: 2004-09-22
Anticipated expiration: 2022-01-22
Also published as: CN1434334A

Abstract

The present invention provides a liquid crystal display, which includes a first surface and a second surface parallel to the first surface. A front light source is arranged on the first surface of the liquid crystal display. And a semi-transmissive and semi-reflective liquid crystal display panel includes a first glass substrate arranged between the front light source and the second surface of the liquid crystal display, a second glass substrate arranged between the first glass substrate and the second surface of the liquid crystal display, and a semi-transmissive and semi-reflective layer arranged between the first glass substrate and the second glass substrate. The liquid crystal display displays images in a reflective manner via the first surface, and displays images in a transmissive manner via the second surface.

Description

LCD

Technical field

The present invention relates to a kind of LCD (liquid crystal display device, LCD device), particularly a kind of semitransparent and half-reflective liquid crystal display (transflective LCD device).

Background technology

Because the low priceization of LCD and high-qualityization, LCD has been widely used on the communication products such as laptop (notebook), PDA(Personal Digital Assistant), mobile phone and clock and watch.LCD is passive luminous flat-panel screens, that is LCD need add light source so that the light source to be provided.And LCD (hereinafter to be referred as LCD) generally can be divided into reflective (reflective) LCD, penetration (transmissive) LCD and semi-penetration, semi-reflective (transflective) LCD.Reflective LCD is meant that light source is entered in the LCD by panel the place ahead, and has a reflecting surface (as aluminum metal) in the reflective LCD, and light reflects also each object of process LCD inside of back at reflecting surface, to allow the user can watch the display frame of LCD.Penetration LCD has the rear that a backlight is arranged at liquid crystal cells usually, and in order to the emitting incident light line, incident ray can optionally pass through after the liquid crystal cells, in the display frame of the place ahead of LCD.Semi-penetration, semi-reflective LCD can utilize display reflective and penetration display frame simultaneously.

Please refer to Fig. 1, Fig. 1 is the basic structure synoptic diagram of an existing semi-penetration, semi-reflective LCD.As shown in Figure 1, a semi-penetration, semi-reflective LCD10 includes Polarizer on (upperpolarizer) 12, a phase shift films (retardation film) 14, one top glass substrate (upper glasssubstrate) 16, reflects a Polarizer 28 and a module backlight (back light assembly) 30 with electrode (common counter electrode) 18, one layer of liquid crystal molecule 20, a transparency electrode 22, a lower glass substrate 24, a light diffusing sheet 26, altogether.The one side of module 30 wherein backlight is for light tight, and includes a light source 30a, a light guide plate 30b and a light absorption plate (light absorbingplate) 30c.And reflection Polarizer 28 is made up of a multilayer film dielectric layer (multi-layer dielectric film), but and light partial reflection and partial penetration reflection Polarizer 28.

As shown in Figure 1, after surround lighting (ambient light) enters and partly penetrates light reflective LCD 10, component environment light passes each object in the LCD10, and via reflecting Polarizer 28 reflections and then passing each object in the LCD10, relief user 32 can watch image frame, and this display mode is reflective.And when ambient light intensity is not enough, light source 30a in the module 30 backlight just can produce light with the compensate for ambient light intensity, the light that light source 30a produces can partial penetration reflect Polarizer 28 and pass each object in the LCD10, relief user 32 watches image frame, and this display mode is penetration.

Because existing semi-penetration, semi-reflective LCD utilizes the lighttight back side of one side module as light source, so the user only can wherein simultaneously watch image frame from LCD.And this kind semi-penetration, semi-reflective LCD is when being applied in the cover-lifting type mobile phone, if desire allows the user see messages such as caller identification from the two-Way Observations of flip, then must respectively install a slice LCD on the two sides of flip, cost of manufacture height not only thus, more can increase the volume and the weight of mobile phone, not meet the trend of the more compact mobile phone of present making.

Summary of the invention

The object of the present invention is to provide a kind of semi-penetrated semi-reflected liquid crystal display, to allow the user watch image frame in the tow sides of display.

According to purpose of the present invention, the invention provides a kind of LCD, its include one first and one with this first parallel relative second.One front light-source, this first of being located at this LCD; One half-penetration half-reflection liquid crystal display panel includes one first glass substrate, is located between this front light-source and this LCD this second; One second glass substrate is located between this first glass substrate and this LCD this second; And a semi-penetration semi-reflective layer, be located between this first glass substrate and this second glass substrate.This LCD is to reflect mode display frame via this first with one, and penetrates mode display frame via this second with one.

Because the present invention utilizes a front light-source system and a semi-penetrating and semi-reflective liquid crystal display panel, is combined into a semi-penetration, semi-reflective LCD, the user can watch display frame in this semi-penetration, semi-reflective LCD two sides.Therefore, the present invention only needs a slice semi-penetration, semi-reflective LCD promptly to can be applicable to the appliance and electronic (as mobile phone) of pros and cons display frame, therefore can save the manufacturing cost of product significantly, and reduces the volume and the weight of appliance and electronic.

Description of drawings

Fig. 1 is the basic structure synoptic diagram of an existing semi-penetration, semi-reflective LCD.

Fig. 2 is the basic structure synoptic diagram of semi-penetration, semi-reflective LCD of the present invention.

Fig. 3 is the display mode synoptic diagram of semi-penetration, semi-reflective LCD of the present invention.

Fig. 4 is the basic structure synoptic diagram of the semi-penetration, semi-reflective LCD of the second embodiment of the present invention.

Fig. 5 is the basic structure synoptic diagram of the semi-penetration, semi-reflective LCD of the third embodiment of the present invention.

Fig. 6 A and Fig. 6 B are for including the mobile phone synoptic diagram of semi-penetration, semi-reflective LCD of the present invention.

The simple symbol explanation

Polarizer on the 10 semi-penetration semi-reflective LCD 12

14 phase shift films, 16 top glass substrate

18 common electrodes, 20 layer of liquid crystal molecule

22 transparency electrodes, 24 lower glass substrate

26 light diffusing sheets, 28 reflection Polarizers

30 module 30a light sources backlight

30b light guide plate 32 users

40 semi-penetration semi-reflective LCD, 42 front light-source systems

42a light source 42b light guide plate

Polarizer 46 top glass substrate on 44

48 common electrodes, 50 layer of liquid crystal molecule

52 metal electrode 52a transparency electrodes

56 times Polarizers of 54 lower glass substrate

58 users, 60 users

70 semi-penetration semi-reflective LCD, 72 front light-source systems

72a light source 72b light guide plate

Polarizer 76 top glass substrate on 74

78 common electrodes, 80 layer of liquid crystal molecule

82 metal electrodes, 84 lower glass substrate

86 times Polarizer 90 semi-penetration semi-reflective LCD

92 92a of front light-source system light sources

Polarizer on the 92b light guide plate 94

96 top glass substrate, 98 common electrodes

100 layer of liquid crystal molecule, 102 transparency electrodes

104 multilayer film dielectric layers, 106 lower glass substrate

108 times Polarizer 110 mobile phones

112 semi-penetration, semi-reflective LCD 112a front panels

112b rear panel 114 users

Embodiment

Please refer to Fig. 2, Fig. 2 is the basic structure synoptic diagram of semi-penetration, semi-reflective LCD of the present invention.As shown in Figure 2, a semi-penetration, semi-reflective LCD40 include Polarizer 44 in the front light-source system (front-lightsystem) 42,, a top glass substrate 46, altogether with electrode 48, a layer of liquid crystal molecule 50, a metal electrode 52, a transparency electrode 52a, a lower glass substrate 54 and Polarizer 56 once.Wherein front light-source system 42 is a light-permeable, and include a light source 42 and a light guide plate 42b, (lightemitting diode LED), is positioned at the side of light guide plate 42b and light source 42a can be cold-cathode tube (cold cathode fluorescent tube) or light emitting diode.Wherein include phase shift films in this Polarizer.Common electrode 48 is that (indium tinoxide, ITO), metal electrode 52 then is about thousands of dusts () for aluminum metal and thickness for a transparent conductive material tin indium oxide with transparency electrode 52a.And metal electrode 52 and transparency electrode 52a are the pixel electrodes as a pixel, and are connected with the source electrode (not shown) of thin film transistor (TFT) in this pixel.

Please refer to Fig. 3, Fig. 3 is the display mode synoptic diagram for semi-penetration, semi-reflective LCD40 of the present invention.As shown in Figure 3, the light that light source 42a is produced enters Polarizer 44 via light guide plate 42b, and this light is transferred to linear polar biased light (linearly polarized light) and passes top glass substrate 46, common electrode 48 and layer of liquid crystal molecule 50 by last Polarizer 44, reflect the back via metal electrode 52 at last and pass layer of liquid crystal molecule 50, common electrode 48, top glass substrate 46, last Polarizer 44 and light guide plate 42b, therefore, user 58 can see the image frame of semi-penetration, semi-reflective LCD40.On the other hand, if this linearity polar biased light is through transparency electrode 52a and following Polarizer 56, then user 60 can see the image frame of semi-penetration, semi-reflective LCD40, and promptly the user can watch image frame in the tow sides of semi-penetration, semi-reflective LCD of the present invention.In addition, also include colored filter (color filter) (not shown) on the top glass substrate 46 of the present invention, so the user can watch colored image frame.

Please refer to Fig. 4, Fig. 4 is the basic structure synoptic diagram of the semi-penetration, semi-reflective LCD of the second embodiment of the present invention.As shown in Figure 4, a semi-penetration, semi-reflective LCD70 include Polarizer 74 in the front light-source system 72,, a top glass substrate 76, altogether with electrode 78, a layer of liquid crystal molecule 80, a metal electrode 82, a lower glass substrate 84 and Polarizer 86 once.Wherein front light-source system 72 includes a light source 72a and a light guide plate 72b, and common electrode 78 is to be a transparent conductive material tin indium oxide.Metal electrode 82 then is aluminum metal or chromium metal, its thickness be about hundreds of dusts () but so that light partial reflection and partial penetration metal electrode 82, and metal electrode 82 is the pixel electrodes as a pixel, and is connected with the source electrode (not shown) of thin film transistor (TFT) in this pixel.

Please refer to Fig. 5, Fig. 5 is the basic structure synoptic diagram of the semi-penetration, semi-reflective LCD of the third embodiment of the present invention.As shown in Figure 5, a semi-penetration, semi-reflective LCD90 include Polarizer 94 in the front light-source system 92,, a top glass substrate 96, altogether with electrode 98, a layer of liquid crystal molecule 100, a transparency electrode 102, a multilayer dielectric tunic (multi-layer dielectric film) 104, one lower glass substrate 106 and Polarizer 108 once.Wherein front light-source system 92 includes a light source 92a and a light guide plate 92b, common electrode 98 is to be a transparent conductive material tin indium oxide with transparency electrode 102, and transparency electrode 102 is the pixel electrodes as a pixel, and is connected with the source electrode (not shown) of thin film transistor (TFT) in this pixel.In addition, but light partial reflection and partial penetration multilayer dielectric tunic 104, and multilayer dielectric tunic 104 is to form for two kinds of macromolecule layers pile up mutually, for example PEN (2,6-polyethylene naphthalate) with coPEN (70-naphthalate/30-terephthalatecopolymer), and multilayer dielectric tunic 104 also can be arranged between lower glass substrate 106 and the following Polarizer 108.

Please refer to Fig. 6 A and Fig. 6 B, Fig. 6 A and Fig. 6 B are the mobile phone synoptic diagram that includes semi-penetration, semi-reflective LCD of the present invention.As shown in Figure 6A, one mobile phone 110 includes a semi-penetration, semi-reflective LCD112 and a rotating unit (not shown), wherein semi-penetration, semi-reflective LCD112 is positioned at the flip of mobile phone 110, when the flip of mobile phone 110 was opened, then user 114 can watch display frame in the front panel 112a of semi-penetration, semi-reflective LCD112.Shown in Fig. 6 B, when the flip of mobile phone 110 was shut, then user 114 can watch display frame in the rear panel 112b of semi-penetration, semi-reflective LCD112.Wherein mobile phone 110 is to utilize this converting unit to show with the front panel 112a of switching semi-penetration, semi-reflective LCD112 and the picture of rear panel 112b.

Than prior art, the present invention utilizes a front light-source system and a semi-penetrating and semi-reflective liquid crystal display panel, is combined into a semi-penetration, semi-reflective LCD, and the user can watch display frame in the tow sides of this semi-penetration, semi-reflective LCD.Therefore, the present invention only needs a slice semi-penetration, semi-reflective LCD promptly to can be applicable to the appliance and electronic (as mobile phone) of tow sides display frame, so can save the manufacturing cost of product significantly, and the volume and the weight that reduce product.

The above only is the preferred embodiments of the present invention, and all equivalences of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.

Claims

1. A liquid crystal display, which includes a first face and a second face parallel to the first face, the liquid crystal display includes:

a front light source is used to generate light, and is arranged on the first surface of the liquid crystal display; and

Half of the penetrating semi-reflective liquid crystal display panel, which includes:

a first glass substrate disposed between the front light source and the second surface of the liquid crystal display;

a second glass substrate disposed between the first glass substrate and the second surface of the liquid crystal display; and

a half-transmitting semi-reflective layer, disposed between the first glass substrate and the second glass substrate, for reflecting and penetrating the light generated by the front light source;

Wherein when the light generated by the front light source is reflected to the first surface of the liquid crystal display through the semi-transparent and semi-reflective layer, the liquid crystal display displays images in a reflective manner through the first surface, and when the light generated by the front light source When the generated light passes through the semi-transmitting and semi-reflecting layer to the second surface of the liquid crystal display, the liquid crystal display displays images in a transmissive manner through the second surface.

2. The liquid crystal display as claimed in claim 1, wherein the front light source is a cold cathode tube.

3. The liquid crystal display as claimed in claim 1, wherein the front light source is a light emitting diode.

4. The liquid crystal display as claimed in claim 1, wherein the liquid crystal display further comprises a light guide plate disposed on the first surface of the liquid crystal display.

5. The liquid crystal display as claimed in claim 1, wherein the transflective liquid crystal display panel further comprises two polarizers, which are respectively arranged on the outer surfaces of the first glass substrate and the second glass substrate, wherein at least one polarizer Contains a retardation film.

6. The liquid crystal display as claimed in claim 1, wherein the transflective layer is a multi-layer dielectric film.

7. The liquid crystal display as claimed in claim 1, wherein the transflective semi-reflective layer includes a plurality of metal regions, the plurality of metal regions are used to reflect the light generated by the front light source, and are not covered by the plurality of metal regions The covered area is used to penetrate the light generated by the front light source.

8. The liquid crystal display as claimed in claim 1, wherein the transflective layer is a metal layer.

9. The liquid crystal display as claimed in claim 7, wherein the plurality of metal regions are composed of aluminum metal.

10. The liquid crystal display as claimed in claim 8, wherein the metal layer is composed of aluminum metal or chrome metal.

11. A liquid crystal display applied to a mobile phone, comprising a first surface and a second surface opposite to the first surface, the liquid crystal display comprising:

Half of the transmissive and semi-reflective liquid crystal display panel, the semi-transmissive and semi-reflective liquid crystal display panel includes:

The half-transmitting semi-reflective layer is arranged between the first glass substrate and the second glass substrate, and is used for reflecting and penetrating the light generated by the front light source, wherein when the light generated by the front light source passes through the half-transmitting When the transflective layer is reflected to the first surface of the liquid crystal display, the liquid crystal display displays images in a reflective manner through the first surface, and when the light generated by the front light source passes through the semi-transmissive and semi-reflective layer, the liquid crystal display screen displays images in a transmissive manner through the second surface; and

A conversion unit is used for switching the image display of the first surface and the second surface of the liquid crystal display.

12. The liquid crystal display as claimed in claim 11, wherein the front light source is a cold cathode tube.

13. The liquid crystal display as claimed in claim 11, wherein the front light source is a light emitting diode.

14. The liquid crystal display as claimed in claim 11, wherein the liquid crystal display further comprises a light guide plate disposed on the first surface of the liquid crystal display.

15. The liquid crystal display as claimed in claim 11, wherein the transflective liquid crystal display panel further comprises two polarizers, which are respectively arranged on the outer surfaces of the first glass substrate and the second glass substrate, wherein at least one polarizer Contains a retardation film.

16. The liquid crystal display as claimed in claim 11, wherein the transflective layer is a multi-layer dielectric film.

17. The liquid crystal display as claimed in claim 11, wherein the transflective semi-reflective layer includes a plurality of metal regions, the plurality of metal regions are used to reflect the light generated by the front light source, and are not covered by the plurality of metal regions. The area covered by the area is used to penetrate the light generated by the front light source.

18. The liquid crystal display of claim 11, wherein the mobile phone comprises a flip cover, and the liquid crystal display is disposed within the flip cover.

19. The liquid crystal display screen as claimed in claim 18, wherein when the flip-type cover of the mobile phone is opened, the switching unit is used to make the liquid crystal display screen display images in a reflective manner through the first surface, And when the foldable cover of the mobile phone is closed, the conversion unit is used to make the liquid crystal display screen display images in a penetrating manner through the second surface.

20. The liquid crystal display screen as claimed in claim 18, wherein when the flip-type cover of the mobile phone is opened, the conversion unit is used to make the liquid crystal display screen display images in a transmissive manner through the second surface, When the foldable cover of the mobile phone is closed, the conversion unit is used to make the liquid crystal display screen display images in a reflective manner through the liquid crystal display screen and the first surface.