阅读说明：本技术 薄膜晶体管基板实现的主动式胆甾相液晶显示屏及其方法 (Active cholesteric liquid crystal display screen realized by thin film transistor substrate and method thereof ) 是由 权建华 周小军 周学秀 于 2019-11-25 设计创作，主要内容包括：本发明涉及一种薄膜晶体管基板实现的主动式胆甾相液晶显示屏。上公共电极基板和下薄膜晶体管TFT基板通过框胶和衬垫固定构成玻璃液晶盒,下薄膜晶体管TFT基板上需光刻出行扫描线和列寻址线,制作出薄膜晶体TFT有源器件开关和像素电极。上公共电极基板上的电极通过转接点转移到下薄膜晶体管TFT基板上。上液晶配向膜与下液晶配向膜间加入液晶配向膜和胆甾相液晶,在下薄膜晶体管TFT基板电极上通过各向异性导电胶条 IC ACF和 FPC ACF分别绑定驱动芯片IC和柔性线路连接板FPC,最后再在下薄膜晶体管TFT基板下表面贴附黑色吸光膜。优点：具有双稳态的效果、响应速度快、对比度高、像素间不会有交叉效应等优势,同时利用现有TFT生产线,利于批量生产。(The invention relates to an active cholesteric liquid crystal display screen realized by a thin film transistor substrate. The upper common electrode substrate and the lower thin film transistor TFT substrate are fixed through frame glue and a liner to form a glass liquid crystal box, and a row scanning line and a column addressing line are required to be etched on the lower thin film transistor TFT substrate to manufacture a thin film transistor active device switch and a pixel electrode. The electrode on the upper common electrode substrate is transferred to the lower thin film transistor TFT substrate through the transfer point. And a liquid crystal alignment film and cholesteric liquid crystal are added between the upper liquid crystal alignment film and the lower liquid crystal alignment film, a driving chip IC and a flexible circuit connecting plate FPC are respectively bound on the electrode of the lower thin film transistor TFT substrate through an anisotropic conductive adhesive tape IC ACF and an FPC ACF, and finally a black light absorption film is attached to the lower surface of the lower thin film transistor TFT substrate. The advantages are that: the double-phase TFT liquid crystal display panel has the advantages of bistable state effect, high response speed, high contrast, no cross effect among pixels and the like, and is beneficial to batch production by utilizing the conventional TFT production line.)

1. The active cholesteric liquid crystal display screen is realized by a thin film transistor substrate, and is characterized in that the active cholesteric liquid crystal display screen structurally comprises an upper common electrode substrate (2), an upper liquid crystal alignment film (3), cholesteric liquid crystals (5), a driving chip (6), a flexible circuit connecting plate (7), a lower liquid crystal alignment film (11), a black light absorption film (12) and a lower thin film transistor TFT substrate (13); the upper common electrode substrate (2) and the lower thin film transistor TFT substrate (13) are fixed through frame glue (1) and a gasket (4) to form a glass liquid crystal box, and an electrode on the upper common electrode substrate (2) is transferred to the lower thin film transistor TFT substrate (13) through a transfer point (10); an upper liquid crystal alignment film (3) is arranged below the upper common electrode substrate (2), a lower liquid crystal alignment film (11) is arranged on the lower thin film transistor TFT substrate (13), and cholesteric liquid crystals (5) are arranged between the upper liquid crystal alignment film (3) and the lower liquid crystal alignment film (11); a driving chip (6) and a flexible circuit connecting plate (7) are bound on an electrode of a lower thin film transistor TFT substrate (13) through an anisotropic conductive adhesive tape, and a black light-absorbing film (12) is attached to the lower surface of the lower thin film transistor TFT substrate (13); and a row scanning line and a column addressing line are etched on the lower thin film transistor TFT substrate (13), and a thin film transistor TFT active device switch and a pixel electrode are manufactured.

2. The active cholesteric liquid crystal display panel realized by the thin film transistor substrate according to claim 1, wherein the anisotropic conductive adhesive tape comprises a CP6920 type IC ACF anisotropic conductive adhesive tape (9) and a CP9731 type FPC ACF anisotropic conductive adhesive tape (8), the CP6920 type IC ACF anisotropic conductive adhesive tape (9) is bound with the driving chip (6), and the CP9731 type FPC ACF anisotropic conductive adhesive tape (8) is bound with the flexible circuit connection board (7).

3. The active cholesteric liquid crystal display panel realized by the thin film transistor substrate according to claim 1, wherein the driving chip (6) has a model of UC 7702C; the flexible circuit connecting plate (7) is E172D in model.

4. An active cholesteric liquid crystal display panel realized by the thin film transistor substrate according to claim 1, wherein the glass liquid crystal cell thickness is 4.0 um.

5. The active cholesteric liquid crystal display panel realized by the thin film transistor substrate according to claim 1, wherein the type of the sealant (1) is XN-5A-C, the thickness is 7 um, the type of the gasket is NM ASE 040, the diameter is 4.0 um, and the density is 250/mm²。

6. An active cholesteric liquid crystal display panel realized by a thin film transistor substrate according to claim 1, wherein the upper liquid crystal alignment film (3) or the lower liquid crystal alignment film (11) is 70% AL-58 with a thickness of 700 a.

7. An active cholesteric liquid crystal display panel realized by a thin film transistor substrate according to claim 1, characterized in that the cholesteric liquid crystal (5) is of the type RDP-a 3133CH 4.

8. An active cholesteric liquid crystal display panel realized by a thin film transistor substrate according to claim 1, wherein the transfer point (10) is a gold sphere NM GD 045.

9. An active cholesteric liquid crystal display panel realized by the thin film transistor substrate according to claim 1, wherein the black reflective film has a model number of BM-818.

10. The method of claim 1, wherein the method comprises the steps of:

1) etching a row scanning line and a column addressing line, a Thin Film Transistor (TFT) active device switch and a pixel electrode on an ITO glass substrate to manufacture a lower TFT substrate;

2) photoetching a common electrode on the other piece of ITO glass to manufacture an upper common electrode substrate;

3) printing liquid crystal alignment liquid on the lower TFT substrate and the upper common electrode substrate, and heating to 150 deg.C after printing^oC, forming a liquid crystal alignment film after curing;

4) printing frame glue on the periphery of the lower thin film transistor TFT substrate through a screen printing mode, and spraying a liner on the substrate;

5) printing a transfer point on the common electrode substrate;

6) attaching the lower thin film transistor TFT substrate and the upper common electrode substrate with the printed frame glue and the switching points together, and sintering at 180 ℃ in a hot pressing manner to solidify the frame glue to form a cholesteric glass liquid crystal empty box;

7) injecting cholesteric liquid crystal into the cholesteric glass liquid crystal empty box by using a vacuum injection method, coating sealing glue on an injection port, and then carrying out ultraviolet curing;

8) cleaning the cholesteric liquid crystal box filled with liquid crystal by using ultrasonic waves and cleaning liquid, and respectively binding an IC (integrated circuit) and an FPA (field programmable gate array) through an anisotropic conductive adhesive tape;

9) and finally attaching a black light-absorbing film to the lower surface of the cholesteric glass liquid crystal display box.

Technical Field

The invention discloses an active cholesteric liquid crystal display screen realized by a thin film transistor substrate and a method thereof, belonging to the technical field of liquid crystal display screens.

Background

The cholesteric liquid crystal is a liquid crystal domain with random helical axis orientation in space, the liquid crystal display screen manufactured by the cholesteric liquid crystal still keeps the display function after power failure, the state of the liquid crystal display screen cannot be changed before the next voltage pulse arrives, and the cholesteric liquid crystal display screen has a bistable effect, so that the cholesteric liquid crystal display screen is widely applied to electronic tags and electronic handwriting paper. The conventional TFT-lcd does not have bistable function and consumes much power, and is generally of a transmissive type, requiring a backlight to display. Not applicable to electronic tags and electronic paper equipment.

Disclosure of Invention

The invention provides an active cholesteric liquid crystal display screen realized by a thin film transistor substrate and a method thereof, aiming at overcoming the defects of the prior liquid crystal display screen technology, the cholesteric liquid crystal display screen is manufactured by the method for realizing the active cholesteric liquid crystal display by utilizing the thin film transistor substrate, the response speed and the display contrast of the cholesteric liquid crystal display screen can be obviously improved, and the phenomenon of cross effect among common LCD pixels is avoided.

The technical solution of the invention is as follows: the active cholesteric liquid crystal display screen realized by the thin film transistor substrate structurally comprises an upper common electrode substrate 2, an upper liquid crystal alignment film 3, cholesteric liquid crystals 5, a driving chip 6, a flexible circuit connecting plate 7, a lower liquid crystal alignment film 11, a black light absorption film 12 and a lower thin film transistor TFT substrate 13; the upper common electrode substrate 2 and the lower thin film transistor TFT substrate 13 are fixed through frame glue 1 and a gasket 4 to form a glass liquid crystal box, and an electrode on the upper common electrode substrate 2 is transferred to the lower thin film transistor TFT substrate 13 through a transfer point 10; an upper liquid crystal alignment film 3 is arranged below the upper common electrode substrate 2, a lower liquid crystal alignment film 11 is arranged on the lower thin film transistor TFT substrate 13, and cholesteric liquid crystals 5 are arranged between the upper liquid crystal alignment film 3 and the lower liquid crystal alignment film 11; the driving chip 6 and the flexible circuit connecting plate 7 are bound on the electrode of the lower thin film transistor TFT substrate 13 through an anisotropic conductive adhesive tape, and the black light-absorbing film 12 is attached to the lower surface of the lower thin film transistor TFT substrate 13; and a row scanning line and a column addressing line are etched on the lower thin film transistor TFT substrate 13, and a thin film transistor TFT active device switch and a pixel electrode are manufactured.

The anisotropic conductive adhesive tape comprises a CP6920 type IC ACF anisotropic conductive adhesive tape 9 and a CP9731 type FPCACF anisotropic conductive adhesive tape 8, wherein the CP6920 type IC ACF anisotropic conductive adhesive tape 9 is bound with a driving chip 6, and the CP9731 type FPC ACF anisotropic conductive adhesive tape 8 is bound with a flexible circuit connecting plate 7. The model of the driving chip 6 is UC 7702C; the flexible circuit connecting plate 7 is E172D. The glass liquid crystal box is 4.0 um in thickness. The type of the frame glue 1 is XN-5A-C, the thickness is 7 um, the type of the liner is NMASE 040, the diameter is 4.0 um, and the density is 250 pieces/mm². The upper liquid crystal alignment film 3 or the lower liquid crystal alignment film 11 is 70% AL-58 and 700 angstroms thick. The cholesteric liquid crystal 5 is RDP-A3133 CH 4. The transfer point 10 is a gold ball NM GD 045. The black reflective film is BM-818.

The working method is characterized by comprising the following steps:

1) etching a row scanning line and a column addressing line, a Thin Film Transistor (TFT) active device switch and a pixel electrode on an ITO glass substrate to manufacture a lower TFT substrate 13;

2) photoetching a common electrode on the other piece of ITO glass to manufacture an upper common electrode substrate 2;

3) printing liquid crystal alignment liquid on the lower TFT substrate 13 and the upper common electrode substrate 2, and heating to 150 deg.C after printing^oC, forming a liquid crystal alignment film after curing;

4) printing frame glue 1 on the periphery of a lower thin film transistor TFT substrate 13 through screen printing, and spraying a liner 4 on the substrate;

5) printing a transfer point on the common electrode substrate;

6) attaching the lower thin film transistor TFT substrate 13 printed with the frame glue and the switching points and the upper common electrode substrate 2 together, and sintering at 180 ℃ under hot pressure to solidify the frame glue to form a cholesteric glass liquid crystal empty box;

7) injecting cholesteric liquid crystal 5 into the cholesteric glass liquid crystal empty box by using a vacuum injection method, coating sealing glue on an injection port, and then carrying out ultraviolet curing;

8) cleaning the cholesteric liquid crystal box filled with liquid crystal by using ultrasonic waves and cleaning liquid, and respectively binding an IC (integrated circuit) and an FPA (field programmable gate array) through an anisotropic conductive adhesive tape;

9) and finally, attaching a black light absorption film 12 to the lower surface of the cholesteric glass liquid crystal display box.

The invention has the beneficial effects that:

has the function of cholesteric liquid crystal bistable state. In addition, the TFT switch of the thin film transistor is actively and accurately controlled to each picture pixel, so that the TFT liquid crystal display has the advantages of high response speed, high contrast, no cross effect among pixels and the like, and can utilize the existing TFT production line to be beneficial to batch production.

Drawings

Fig. 1 is a schematic diagram of a cholesteric liquid crystal display screen manufactured by a method for realizing active cholesteric liquid crystal display by using a thin film transistor substrate.

In the attached figure 1, 1 is frame glue, 2 is an upper common electrode substrate, 3 is an upper liquid crystal alignment film, 4 is a liner, 5 is cholesteric liquid crystal, 6 is a driving chip IC, 7 is a flexible circuit connecting plate FPC, 8 is an anisotropic conductive rubber strip FPC ACF, 9 is an anisotropic conductive rubber strip IC ACF, 10 is a transfer point, 11 is a lower liquid crystal alignment film, 12 is a black light absorption film, and 13 is a lower thin film transistor TFT substrate.

Detailed Description

The cholesteric liquid crystal display screen manufactured by the method for realizing the active cholesteric liquid crystal display by utilizing the thin film transistor substrate is a novel liquid crystal display screen manufactured by effectively combining a conventional thin film transistor TFT liquid crystal display screen and a conventional cholesteric liquid crystal display screen.

The TFT glass substrate is different from the common LCD substrate in that row scanning lines and column addressing lines are etched on the lower glass substrate to form a matrix, and the switches and pixel electrodes of the TFT active devices are manufactured at the intersection points of the matrix. Each pixel is controlled by a Thin Film Transistor (TFT) active device switch, so that the electric field effect of the cholesteric liquid crystal is actively controlled, the cholesteric liquid crystal is twisted in the liquid crystal box, and the purpose of liquid crystal display is achieved. Each pixel can be structurally viewed as a pixel electrode and a common electrode sandwiching a layer of liquid crystal, with thin film transistor TFT active devices being developed to control the deflection of the liquid crystal molecular arrangement within its pixel. Because each pixel is directly controlled by a corresponding thin film transistor TFT, pixel points are relatively independent, and meanwhile, the thin film transistor TFT has a capacitance effect, can keep a potential state and has a continuous control function, so that the response speed and the display contrast of the cholesteric liquid crystal display screen can be improved. The cross effect phenomenon between the pixels of the common LCD is avoided.

The cholesteric liquid crystal display screen is manufactured by a method for realizing active cholesteric liquid crystal display by utilizing the thin film transistor substrate. The structure of the glass liquid crystal box comprises an upper common electrode substrate and a lower thin film transistor TFT substrate which are fixed through frame glue and a liner to form the glass liquid crystal box with the thickness of 4.0 um, wherein a row scanning line and a column addressing line are required to be etched on the lower thin film transistor TFT substrate, and a thin film transistor active device switch and a pixel electrode are manufactured. The electrode on the upper common electrode substrate is transferred to the lower thin film transistor TFT substrate through the transfer point. An upper liquid crystal alignment film is arranged below the upper common electrode substrate, a lower liquid crystal alignment film is arranged on the lower thin film transistor TFT substrate, cholesteric liquid crystal is added between the upper liquid crystal alignment film and the lower liquid crystal alignment film, a driving chip IC and a flexible circuit connecting plate FPC are respectively bound on an electrode of the lower thin film transistor TFT substrate through an anisotropic conductive adhesive tape IC ACF and the FPC ACF, and finally a black light absorption film is attached to the lower surface of the lower thin film transistor TFT substrate.

The technical scheme of the invention is further explained by combining the attached drawings

As shown in fig. 1, a cholesteric liquid crystal display screen is manufactured by a method for realizing active cholesteric liquid crystal display by using a thin film transistor substrate. The structure of the liquid crystal display panel comprises frame glue 1, an upper common electrode substrate 2, an upper liquid crystal alignment film 3, a liner 4, cholesteric liquid crystals 5, a driving chip IC6, a flexible circuit connecting plate FPC 7, an anisotropic conductive adhesive tape FPC ACF8, an anisotropic conductive adhesive tape IC ACF9, a switching point 10, a lower liquid crystal alignment film 11, a black light absorption film 12 and a lower thin film transistor TFT substrate 13.

The upper common electrode substrate 2 and the lower thin film transistor TFT substrate 13 are fixed through the frame glue 1 and the liner 4 to form a glass liquid crystal box with the thickness of 4.0 um, wherein a row scanning line and a column addressing line are required to be etched on the lower thin film transistor TFT substrate 13, and a thin film transistor active device switch and a pixel electrode are manufactured. The electrode on the upper common electrode substrate 2 is transferred to the lower thin film transistor TFT substrate 13 through the transfer point 10. An upper liquid crystal alignment film 3 is arranged below the upper common electrode substrate 2, a lower liquid crystal alignment film 11 is arranged above the lower thin film transistor TFT substrate 13, cholesteric liquid crystal 5 is added between the upper liquid crystal alignment film 3 and the lower liquid crystal alignment film 11, a driving chip IC6 and a flexible circuit connecting board FPC 7 are respectively bound on an electrode of the lower thin film transistor TFT substrate 13 through an anisotropic conductive adhesive tape IC ACF9 and an FPCACF8, and finally a black light absorption film 12 is attached to the lower surface of the lower thin film transistor TFT substrate 13.