TWI663445B - Liquid crystal display module with handwriting function and manufacturing method thereof - Google Patents

Abstract

The invention discloses a liquid crystal display module with a handwriting function and a manufacturing method thereof. The liquid crystal display module 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 surface of the second metal circuit board is coated with a cholesteric liquid crystal. One end of a polymer, TFT-LCD panel is convexly provided with a connection block, and the connection 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 or a handwriting tablet, and its structure is simple and easy to process, which not only increases the function of the product, but also improves its 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 drive it with a voltage to achieve display. 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 top; a display function: the liquid crystal display transmits a signal to a TFT-LCD panel, and the TFT-LCD panel displays the light so that the light penetrates the cover; the handwriting function: the stylus performs on the cover Handwriting, pressing the surface of the cover plate, the liquid crystal molecules change axially under the action of external forces, light and dark contrast will be formed when light passes through the liquid crystal molecules, and the cholesteric liquid crystal polymer will record the traces of the stylus, so that It is displayed on the screen to implement the handwriting function.

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, and drying , 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 with the clear-screen drive board; S7. The clear-screen button on the clear-drive board is led to two GPIO interfaces, and the GPIO interface drive is controlled by the TV motherboard. Clear screen driver board Clear screen; S8. Assemble the backlight and TFT-LCD panel to complete a liquid crystal display module with handwriting function that has both the function of a liquid crystal display module and can be used as a tablet education or conference display board group.

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.

Wherein, in step S6, a pressure head of 160 ± 5 ° C and a pressure of 22 ± 1 kgf are pressed for 6 seconds to package the driving IC on the TFT-LCD panel, and then a pressure head of 155 ± 5 ° C is used. in At a pressure of 6 ± 1kgf, press for 10 seconds to encapsulate the liquid crystal display 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. The upper surface of the metal circuit board 6 is coated with a cholesteric liquid crystal polymer 7, and one end of the TFT-LCD panel 2 is protruded outward. There is a connection block 8 which is connected with a liquid crystal display FPC9 and a driver IC 10; the display function: the liquid crystal display transmits signals to the TFT-LCD panel 2 and the TFT-LCD panel 2 displays, so that the light penetrates the cover 1 and is displayed ; Handwriting function: the stylus performs handwriting on the cover plate 1 and presses the surface of the cover plate 1, the liquid crystal molecules undergo an axial change under the action of external force, and light passes through the liquid crystal molecules to form a light and dark contrast, and a cholesteric liquid crystal polymer 7 will record the traces of the stylus, 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 and a clear-screen pressing button. The button 15 and the lithium battery 19 are electrically connected to the lithium battery, and the clear 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, a first metal circuit board 3 is formed by coating the ITO circuit on the cover plate 1, and one end of the first metal circuit board 3 is extended with a first electrode outward, and then dried to make the first metal The circuit board is dry and flat; S2, the upper polarizer 4 is attached to the upper surface of the TFT-LCD panel 2, a cholesteric liquid crystal polymer 7 is prepared, and the cholesteric liquid crystal and the alignment glue polymer are 7: 3. The ratios are mixed to orient 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 compounded on the cholesteric liquid crystal adhesive polymer in step S2; S4, Attach the lower polarizer 5 to the lower surface of the TFT-LCD panel 2 and place it in a defoamer to remove the bubbles. S5. Encapsulate the driver IC 10 on the TFT-LCD panel 2 Then, the liquid crystal display FPC9 is packaged on the TFT-LCD panel 2; S6. Each lead is drawn out between the first electrode 11 and the second electrode 12, and is connected to the screen cleaning driving board 13 as a whole. ; S7. The clear-screen driving board 13 is provided with a clear-screen button 15; S8. The backlight 16 and the TFT-LCD panel 2 are assembled to form a liquid crystal display module with a handwriting function.

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

In this embodiment, the coating thickness of the cholesteric liquid crystal polymer aligned in step S2 is 0.25-0.35 mm.

In this embodiment, in step S6, the driver IC 10 is packaged on the TFT-LCD panel 2 with a pressure of 160 ± 5 ° C and a pressure of 22 ± 1 kgf for 6 seconds, and then 155 is used. The indenter of ± 5 ° C. was pressed for 10 seconds under a pressure of 6 ± 1 kgf to encapsulate the liquid crystal display FPC9 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 (2)

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 A cholesteric liquid crystal polymer, one end of the TFT-LCD panel is convexly provided with a connection block, and the connection block is packaged with a liquid crystal display FPC and a driving IC; the liquid crystal display FPC transmits a signal to the TFT- LCD panel, the TFT-LCD panel performs display, so that light penetrates the cover plate; a stylus pen writes on the cover plate, pressing the surface of the cover plate, and the liquid crystal molecules are axially changed by the external force When light passes through the liquid crystal molecules, a contrast between light and dark will be formed, and the cholesteric liquid crystal polymer will record the traces of the stylus, and then display them on the cover plate to form a liquid crystal with a handwriting function. Display module Wherein, the first metal circuit board and the cholesteric liquid crystal polymer are bonded by OCA glue, and the cover plate and the TFT-LCD panel are also bonded by OCA glue; wherein, the A first electrode extends outward at one end of the first metal circuit board, a second electrode extends outward at one end of the second metal circuit board, and the first electrode and the second electrode are electrically connected to the clear-screen driving board. ; Wherein 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 the 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. 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 one end of the second metal circuit board extends outward. There is a second electrode, which is then dried to dry and level the second metal circuit board; the ITO circuit is evenly coated on the cover plate to form a first metal circuit board, and one end of the first metal circuit board extends outward There is a first electrode, which is then dried to make the first metal circuit board dry and flat; S2, the upper polarizer is attached to the upper surface of the TFT-LCD panel, and a cholesteric liquid crystal polymer is formulated, which will simply A cholesteric liquid crystal polymer and an alignment glue polymer are mixed at a ratio of 7: 3 to form the cholesteric liquid crystal polymer, the cholesteric liquid crystal polymer is aligned, and the cholesteric liquid crystal with good alignment is aligned. The polymer is coated on the surface of the upper polarizer; S3. The cover plate with the first metal circuit board is recombined above the molded product in step S2; S4. The lower polarizer is attached to the TFT- The lower surface of the LCD panel Defoaming in the middle to remove the bubbles generated during the attaching process; S5. After the driver IC is packaged on the TFT-LCD panel, a liquid crystal display FPC is packaged on the TFT-LCD panel; S6. The first electrode A lead wire is drawn from the second electrode and connected to the clear-screen drive board; S7. The clear-screen button on the clear-drive board is led to two GPIO interfaces and controlled by the TV motherboard The GPIO interface drives the clear screen driving board to clear the screen; S8. Assemble the backlight and the TFT-LCD panel to form a liquid crystal display module with a handwriting function; wherein the ITO circuit in step S1 The coating thickness is 0.25-0.35um, and the resistance value is 500 ± 150 ohms; wherein the coating thickness of the biliary liquid crystal polymer oriented in the step S2 is 0.25-0.35mm; wherein, the step S6 is used in The indenter of 160 ± 5 ℃ was pressed for 6 seconds under the pressure of 22 ± 1kgf, the driver IC was packaged on the TFT-LCD panel, and then the indenter of 155 ± 5 ℃ was used at 6 ± 1kgf. Under the pressure of 10 seconds, the liquid crystal display FPC is packaged on the TFT-LCD panel.