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The Liquid Crystal Display Module TFT LCD Manufacturing Process

Views: 309     Author: Kaylee     Publish Time: 2023-11-27      Origin: Site


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The Liquid Crystal Display Module TFT LCD Manufacturing Process

There are three components that make up the TFT LCD liquid crystal display module. These components are the backlight system, the circuit system, and the light colour management system. All of these components are organised in a vertical pattern, with the bottommost component coming first and the highest component coming last. The production of TFT LCD liquid crystal display modules will begin with the first step, which will be the manufacturing of the internal light colour control system. Starting from that point, we will gradually work our way up to the point where we manufacture the full module.

In the manufacturing process of TFT LCD liquid crystal display modules, there are three fundamental stages that are often split out during the production process. The TFT array process, the LCD panel process, and the LCD module process are all included in these phases. First and second stages are involved with the process of controlling the amount of light and colour that is present. The TFT substrate, the CF substrate (colour filter), and the LC substrate (liquid crystal) are the three stages that make up the LCD screen. Together, these three substrates are referred to as the LCD screen. The backlight system, the LCD panel, and the module circuit system (driver IC) are all integrated and assembled in this final process, which comprises the integration and assembly of all three components.

Technology Using TFT Arrays


A TFT array is formed on the glass substrate through the process of driving liquid crystals, which is referred to as the TFT array process. The purpose of this stage is to increase the efficiency of the task by going through a lot of process steps on a large glass substrate to accomplish this. Following the completion of the subsequent steps, the glass substrate will be cut into small pieces that are in accordance with the standards.

Let's begin by introducing ITO, which is an essential component. Conducting glass is referred to by its abbreviation, ITO, which stands for indium tin oxide. In Chinese, it is more commonly referred to as ITO. Additionally, it contains qualities of optical transparency and conductivity, and it can be put into thin films with simplicity. The production of glass substrates for TFT LCDs is a common application of this material as a consequence.

LCD Panel Operation

A TFT substrate is created using the TFT array method that was used previously. In order to make an LCD panel, the TFT substrate and the CF substrate are first bonded together, and then LCD material is injected anywhere in between them. Let's move on to the next topic, which is the production of CF using TFT substrates. An approach that is commonly used in this context is referred to as the PR (photoresist) approach. From the very beginning to the very end, the PR photoresist method will be utilised in the production of TFT and CF substrates.

  • Production Method Of TFT Substrate:

1.Arrange the components of the semiconductor and the ITO on a glass substrate in accordance with the design.

2. Apply a layer of photoresist to the surface.

3. Clean the photoresist after it has been partially exposed throughout the process.

4. In order to include the ITO and semiconductor into the circuit, be sure to remove the photoresist cover from both of them.

5. Remove any photoresist that may have been there.

In order to construct the entire circuit, it is frequently necessary for us to repeat the operations that came before it five times first.

  • Production Of Cf (Colour Filter) Substrates:

1. On a glass substrate, construct a black matrix by employing the PR method. This will serve as the border.

2.Using a layer of paint, cover the layer that contains the RGB (red, green, and blue) colours.

3. A circuit made of ITO glass substrate was deposited.

  • TFT Substrate With Cf Substrate Integration Process:

1. The CF and TFT glass substrates need to be constructed and filled with liquid crystals at this step in the technology development process.

2. On the ITO side of the TFT glass substrate and the CF glass substrate, apply a polyimide film, also known as a coordination film, in order to restrict the initial direction of the molecules associated with the liquid crystal.

3. Using glue, construct a border for the liquid crystal by attaching two pieces of glass together to acquire the desired effect. A second layer of conductive glue should be applied on top of the glass substrate that the CF is made of. It is now feasible to establish a connection between the control circuit and the molecules of the liquid crystal.

4. Pour liquid crystal into the space between the two boundaries.

5. Once the two glass substrates have been adhered to one another, chop the enormous glass substrate into little pieces that are in accordance with the specifications.

6. Apply polarizers to the glass substrate that has been cut on both sides of the glass substrate.

The Process Of The LCD Module

The integration and assembly of the LCD panel, driver integrated circuit, and backlight system constitute the LCD module process, which is primarily broken down into the following steps.


1. Attach the circuit system to the LCD panel.

2. Attach the driver IC to the LCD panel.

3. Attach the flexible circuit board, or FPC, to the driver IC.

4. Attach the external PCBA (printed circuit board assembly) to the FPC and  get the backlighting setup.

5. Attach the backlight light source—typically an LED or CCFL—to the light guide plate and place a reflective film underneath it.

6. Arrange the prism and diffusion films on the backlight source in that order. These two films are utilised to increase the light intensity and transform the backlight source's point light into area light along with the reflective film.

7. Attach the lighting source to the other kind of PCBA, the optical control circuit.

After the TFT LCD LCD display module is completed, the last step is to combine it completely with the screen frame structure and carry out a number of ageing tests.

The manufacturing procedure for the complete TFT LCD liquid crystal display module is briefly described above. Important processes that have a direct impact on the product quality and cost management of LCD modules include the TFT array, LCD panel, and LCD module processes.




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