TW201823814A - Liquid crystal display module with handwriting function and manufacturing method thereof can be used as a display screen as well as a handwriting board - Google Patents

Abstract

The present invention discloses a liquid crystal display module with handwriting function and a manufacturing method thereof, comprising a cover plate and a TFT-LCD panel fixedly attached thereto. The lower surface of the cover plate is plated with a first metal circuit board. The upper surface of the TFT-LCD panel is fixedly attached with an upper polarizer, and the lower surface is fixedly attached with a lower polarizer. The upper surface of the upper polarizer is plated with a second metal circuit board. The upper surface of the second metal circuit board is coated with a cholesteric liquid crystal polymer. One end of the TFT-LCD panel is outwardly protruded and provided with a connecting block. The connecting block is packaged with a liquid crystal display FPC and a driving IC. The liquid crystal display module of the present invention can be used as a display screen as well as a handwriting board, and its structure is simple and easy to be processed, which not only increases the functions of the product but also improves the competitiveness.

Description

Liquid crystal display module with handwriting function and manufacturing method thereof

The invention relates to the technical field of liquid crystal displays, in particular to a liquid crystal display module with a handwriting function and a manufacturing method thereof.

At present, a conventional liquid crystal writing tablet is filled with a cholesteric liquid crystal polymer between two PETs. When pressure is applied to the surface of the PET, the track can be recorded. Driven by a certain voltage waveform, the cholesteric liquid crystal returns to its original state. Such a tablet has a single function, which limits its market competitiveness.

The existing liquid crystal display module is to package an IC on a TFT-LCD, attach a polarizer, and then use voltage to drive the display. However, as the TFT technology matures and the market is saturated, the profit and competitiveness of the liquid crystal display module is also increasing. decline.

If these two products can be combined into one, the competitiveness of the products will be greatly improved.

In view of the shortcomings in the above technology, the present invention provides a liquid crystal display module with a handwriting function that is simple in processing technology and low in manufacturing cost, and a manufacturing method thereof.

In order to achieve the above object, the liquid crystal display module with a handwriting function of the present invention includes a cover plate and a TFT-LCD panel fixedly attached to the cover plate. The lower surface of the cover plate is plated with a first metal circuit board and the upper surface of the TFT-LCD panel. An upper polarizer is fixedly attached, and a lower surface is fixedly attached to the bottom A polarizer, the upper surface of the upper polarizer is plated with a second metal circuit board, and the surface of the second metal circuit board is coated with a cholesteric liquid crystal polymer. One end of the TFT-LCD panel is provided with a connecting block protruding outward. A liquid crystal display FPC and a driver IC are packaged on the display; a display function: the liquid crystal display transmits a signal to a TFT-LCD panel, and the TFT-LCD panel displays it so as to be displayed on a cover plate; a handwriting function: a stylus pen performs handwriting on the cover plate When the surface of the cover plate is pressed, the liquid crystal molecules undergo an axial change under the action of external forces, and the optical transmission forms a contrast between light and dark. The cholesteric liquid crystal polymer will record the traces of the stylus, which will be displayed on the cover plate to achieve handwriting. Features.

Wherein, the first metal circuit board and the cholesteric liquid crystal polymer are bonded by an OCA glue, and the cover plate and the TFT-LCD panel are also bonded by an OCA glue.

Wherein, one end of the first metal circuit board is extended with a first electrode outward, one end of the second metal circuit board is extended with a second electrode, and the first electrode and the second electrode are connected with the clear screen driving board. Electrical connection.

The clear screen driving board is provided with a tablet FPC, a clear screen button, and a lithium battery. The clear screen button is electrically connected to the lithium battery, and the clear screen button is electrically connected to the tablet FPC.

A backlight is provided on a lower surface of the lower polarizer, and the backlight is recessed inward to form a receiving groove, and the TFT-LCD panel is located in the receiving groove.

To achieve the above object, the present invention also provides a method for manufacturing a liquid crystal display module with a handwriting function, including the following steps: S1, uniformly coating the ITO circuit on the surface of the upper polarizer, forming a second metal circuit board, , So that the second metal circuit board is dry and flat. In the same way, ITO The first metal circuit board is formed on the circuit coating cover; S2, the upper polarizer is affixed to the upper surface of the TFT-LCD panel, and the cholesteric liquid crystal polymer is formulated, and the cholesteric liquid crystal and the alignment glue polymer are 7: 3 The ratios of the cholesteric liquid crystals are mixed to align the cholesteric liquid crystals. The oriented polymer is coated on the surface of the upper polarizer; S3. The cover with the first metal circuit board is laminated on S2; S4. The lower polarizer is attached to the lower surface of the TFT-LCD panel, and then placed Defoam in the defoamer and remove the bubbles generated by the attachment; S5. After the driver IC is packaged on the TFT-LCD panel, the liquid crystal display FPC is packaged on the TFT-LCD panel to achieve the display function; S6. A lead wire is drawn between the electrode and the second electrode, which is connected to the clear-screen driver board; S7. The clear-screen button on the clear-driver board is led to two GPIO interfaces, and the GPIO interface is controlled by the TV motherboard. Use the driver to clear the screen, and the signal is output to the liquid crystal module at the same time. S8. Assemble the backlight and the TFT-LCD panel to complete a liquid crystal display module function, which can also be used as a tablet education or conference display board. Used LCD module with handwriting function.

The coating thickness of the ITO line in the step S1 is 0.25-0.35um, and the resistance value is 500 ± 150 ohms.

Wherein, the oriented polymer coating thickness in the step S2 is 0.25-0.35 mm.

In the step S6, a pressure of 160 ± 5 ° C is used, and a pressure of 22 ± 1 kgf is used. Next, press 6S, package the driver IC on the TFT-LCD panel, and then press 10S under the pressure of 6 ± 1kgf with an indenter of 155 ± 5 ℃ to package the LCD FPC on the TFT-LCD panel. .

The beneficial effect of the present invention is that compared with the prior art, the liquid crystal display module with a handwriting function provided by the present invention and a manufacturing method thereof can be used as an ordinary liquid crystal display module. When the handwriting board function is not used, the cholesteric liquid crystal The effect of the polymer and the cover on the display effect of the liquid crystal display module is very small. When the liquid crystal display module is not displayed in the off state, the liquid crystal display module is black. At this time, you can use a stylus to apply pressure to the surface of the product. Display the trajectory of pressure, realize the function of the tablet, and record the content of the tablet. If necessary, technologies such as Wifi or Bluetooth will display the handwritten content on the liquid crystal module. The liquid crystal display module of the present invention can be used as a display screen. It can also be used as a handwriting tablet, and its structure is simple and easy to process, which not only increases the function of the product, but also improves competitiveness.

1‧‧‧ cover

2‧‧‧TFT-LCD Panel

3‧‧‧The first metal circuit board

4‧‧‧ upper polarizer

5‧‧‧ bottom polarizer

6‧‧‧Second metal circuit board

7‧‧‧ cholesteric liquid crystal polymer

8‧‧‧ connection block

9‧‧‧ LCD FPC

10‧‧‧Driver IC

11‧‧‧first electrode

12‧‧‧Second electrode

13‧‧‧Clear screen driver board

14‧‧‧FPC

15‧‧‧Clear screen button

16‧‧‧ backlight

17‧‧‧ receiving trough

18‧‧‧OCA glue

19‧‧‧ lithium battery

FIG. 1 is a structural diagram of a liquid crystal display module with a handwriting function according to the present invention; FIG. 2 is a top view of FIG. 1.

In order to express the present invention more clearly, the present invention is further described below with reference to the accompanying drawings.

Please refer to FIGS. 1-2. A liquid crystal display module with a handwriting function provided by the present invention includes a cover plate 1 and a TFT-LCD panel 2 fixedly attached thereto. The lower surface of the cover plate 1 is plated with a first metal circuit board. 3. The upper surface of the TFT-LCD panel 2 is fixed with an upper polarizer 4 and the lower surface is fixed with a lower polarizer 5. The upper surface of the upper polarizer 4 is plated with a second metal circuit board 6. metal The upper surface of the circuit board 6 is coated with a cholesteric liquid crystal polymer 7. One end of the TFT-LCD panel 2 is convexly provided with a connection block 8. The connection block 8 is packaged with a liquid crystal display FPC9 and a driving IC 10. The display function: the liquid crystal display will The signal is transmitted to the TFT-LCD panel 2, and the TFT-LCD panel 2 displays it and displays it on the cover 1. The handwriting function: the stylus writes on the cover 1 and presses the surface of the cover 1. The liquid crystal molecules are exposed to external forces. Under the action, the axial change occurs, and the optical transmission forms a contrast between light and dark. The cholesteric liquid crystal polymer 7 will record the traces of the stylus pen, which will be displayed on the cover plate 1 to realize the handwriting function.

Relative to the situation of the prior art, the liquid crystal display module with handwriting function provided by the present invention can be used as an ordinary liquid crystal display module. When the handwriting tablet function is not used, the cholesteric liquid crystal polymer 7 and the cover plate 1 are used for liquid crystal display. The effect of the display effect of the module is very small. When the liquid crystal display module is not displayed in the off state, the liquid crystal display module is black. At this time, when pressure is applied to the surface of the product with a stylus, the trajectory of pressure can be displayed to achieve handwriting. Board function, if needed, Wifi or Bluetooth technology displays handwritten content on the LCD module. The liquid crystal display module of the present invention can be used as a display screen or a tablet, and its structure is simple and easy to process. Increased product functionality and competitiveness.

In this embodiment, the first metal circuit board 3 and the cholesteric liquid crystal polymer 4 are bonded by the OCA adhesive 18, and the cover plate 1 and the TFT-LCD panel 2 are also bonded by the OCA adhesive 18. The OCA glue 18 is filled into the gap between the cover plate 1 and the TFT-LCD panel 2.

In this embodiment, one end of the first metal circuit board 3 extends outwardly with a first electrode 11, and one end of the second metal circuit board 6 extends outwardly with a second electrode 12. The first electrode 11 and the second electrode 12 and The clear screen driving board 13 is electrically connected. The clear screen driving board 13 is used to clear the screen when handwriting.

In this embodiment, the clear-screen driving board 13 is provided with a tablet FPC14, a clear-screen button 15 and a lithium battery 19, the clear-screen button 15 is electrically connected to the lithium battery, and the clear-screen button 15 is electrically connected to the tablet FPC14. When the clear screen button 15 is turned on, the cholesteric liquid crystal polymer 7 is subjected to the action of the electric field, and is restored to the initial state, and the stylus track is cleared.

In this embodiment, a backlight 14 is provided on the lower surface of the lower polarizer 5. The backlight 16 is recessed inward to form a receiving groove 17, and the TFT-LCD panel 2 is located in the receiving groove 17.

The present invention also provides a method for manufacturing a liquid crystal display module with a handwriting function, including the following steps: S1, uniformly coating an ITO circuit on the surface of the upper polarizer 4 to form a second metal circuit board 6; The two metal circuit boards are dry and flat. According to the same method, the first metal circuit board 3 is formed by coating the ITO circuit on the cover plate 1; S2, the upper polarizer 4 is attached to the upper surface of the TFT-LCD panel 2, the cholesteric liquid crystal polymer 7 is formulated, and the bile The cholesteric liquid crystal and the alignment polymer are mixed at a ratio of 7: 3 to align the cholesteric liquid crystal. The oriented polymer is coated on the surface of the upper polarizer; S3. The cover plate 1 with the first metal circuit board 3 is laminated on S2; S4. The lower polarizer 5 is attached under the TFT-LCD panel 2 Surface, and then put it into a defoamer to remove bubbles, remove the bubbles generated from the attachment; S5. After the driver IC 10 is packaged on the TFT-LCD panel 2, the liquid crystal display FPC9 is packaged on the TFT-LCD panel 2 to realize the display Function; S6. Draw a lead wire between the first electrode 11 and the second electrode 12 and connect it with the clear screen drive board 13; S7. Pull out the clear screen button 15 on the clear drive board 13 GPIO The TV board controls the GPIO interface to clear the screen with the driver. At the same time, the signal is output to the LCD module and displayed. S8. Assemble the backlight 16 and the TFT-LCD panel 2 to complete a function of both the LCD module. It can also be used as a handwriting tablet education or conference display board with a handwriting function LCD display module.

In this embodiment, the coating thickness of the ITO circuit in step S1 is 0.25-0.35um, and the resistance value is 500 ± 150 ohms.

In this embodiment, the oriented polymer coating thickness in step S2 is 0.25-0.35 mm.

In this embodiment, in step S6, a pressure head of 160 ± 5 ° C and a pressure of 22 ± 1 kgf are used to press 6S to package the driving IC 10 on the TFT-LCD panel 2. Then, a 155 ± 5 ° C The indenter presses 10S under the pressure of 6 ± 1kgf to package the liquid crystal display FPC 9 on the TFT-LCD panel 2.

TFT: thin film field effect transistor, which belongs to an active matrix liquid crystal display.

FPC: Flexible circuit board is a kind of flexible printed circuit board with high reliability and excellent flexibility, which is made of polyimide or polyester film as the base material, referred to as flexible board or FPC.

OCA glue: Special adhesive for bonding transparent optical components.

The present invention is not limited to this, and any change that can be considered by those skilled in the art should fall into the protection scope of the present invention.

Claims (9)

A liquid crystal display module with a handwriting function is characterized in that it includes a cover plate and a TFT-LCD panel fixedly attached thereto. The lower surface of the cover plate is plated with a first metal circuit board and the TFT-LCD panel. An upper polarizer is fixed on the upper surface and a lower polarizer is fixed on the lower surface. The upper surface of the upper polarizer is plated with a second metal circuit board, and the upper surface of the second metal circuit board is coated with Cholesteric liquid crystal polymer. One end of the TFT-LCD panel is convexly provided with a connection block. The connection block is packaged with a liquid crystal display FPC and a driver IC. Display function: The liquid crystal display transmits signals to the TFT-LCD panel. TFT-LCD panel to display, so as to display on the cover; handwriting function: the stylus writes on the cover, presses the surface of the cover, the liquid crystal molecules change axially under the action of external forces, and optical transmission forms a light and dark contrast The cholesteric liquid crystal polymer will record the traces of the stylus pen, which will be displayed on the cover plate to realize the handwriting function. The liquid crystal display module with a handwriting function according to claim 1, wherein the first metal circuit board and the cholesteric liquid crystal polymer are bonded by an OCA glue, and the cover plate and the TFT-LCD The panels are also bonded by OCA glue. The liquid crystal display module with a handwriting function according to claim 1, wherein one end of the first metal circuit board extends outward with a first electrode, and one end of the second metal circuit board extends outward with a second Electrode, the first electrode and the second electrode are electrically connected with the clear screen driving board. The liquid crystal display module with a handwriting function according to claim 3, wherein the clear screen driving board is provided with a tablet FPC, a clear screen button, and a lithium battery, and the clear screen button is electrically connected to the lithium battery. The clear screen button is electrically connected to the tablet FPC. The liquid crystal display module with a handwriting function according to claim 1, wherein the lower part of the lower polarizer is A backlight is provided on the surface, and the backlight is recessed inward to form a receiving groove, and the TFT-LCD panel is located in the receiving groove. A method for manufacturing a liquid crystal display module with a handwriting function includes the following steps: S1. The ITO circuit is evenly coated on the surface of the upper polarizer to form a second metal circuit board, and the second metal circuit board is dried to dry, smooth. According to the same method, the ITO circuit is coated on the cover to form the first metal circuit board; S2, the upper polarizer is attached to the upper surface of the TFT-LCD panel, and the cholesteric liquid crystal polymer is formulated to align the cholesteric liquid crystal with The gum polymer is mixed at a ratio of 7: 3 to orient the cholesteric liquid crystal. The oriented polymer is coated on the surface of the upper polarizer; S3. The cover with the first metal circuit board is laminated on S2; S4. The lower polarizer is attached to the lower surface of the TFT-LCD panel, and then placed Defoam in the defoamer and remove the bubbles generated by the attachment; S5. After the driver IC is packaged on the TFT-LCD panel, the liquid crystal display FPC is packaged on the TFT-LCD panel to achieve the display function; S6. A lead wire is drawn between the electrode and the second electrode, which is connected to the clear-screen driver board; S7. The clear-screen button on the clear-driver board is led to two GPIO interfaces, and the GPIO interface is controlled by the TV motherboard. Use the driver to clear the screen, and the signal is output to the liquid crystal module at the same time. S8. Assemble the backlight and the TFT-LCD panel to complete a liquid crystal display module function, which can also be used as a tablet education or conference display board. Used LCD module with handwriting function. The method for manufacturing a liquid crystal display module with a handwriting function according to claim 6, wherein: The coating thickness of the ITO circuit in the step S1 is 0.25-0.35um, and the resistance value is 500 ± 150 ohms. The method for manufacturing a liquid crystal display module with a handwriting function according to claim 6, wherein the oriented polymer coating thickness in step S2 is 0.25-0.35 mm. The method for manufacturing a liquid crystal display module with a handwriting function according to claim 6, wherein in step S6, a pressure of 160 ± 5 ° C and a pressure of 22 ± 1kgf are used to press 6S to drive the driver. The IC is packaged on a TFT-LCD panel, and then a 155 ± 5 ° C indenter is used to press 10S under a pressure of 6 ± 1kgf to package the liquid crystal display FPC on the TFT-LCD panel.