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Problems with TFT-LCD Screen Flickering And Color Difference

Views: 317     Author: Reshine Display     Publish Time: 2023-11-20      Origin: Site


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Problems with TFT-LCD Screen Flickering And Color Difference

Causes of TFT-LCD screen flickering

TFT-LCD screens are now widely and frequently used in the industrial control field. However, flashing screens may occur on TFT-LCD screens during the process. The display of the LCD screen is generally referred to as the flashing screen. During equipment operation, the screen appears to be flickering or irregularly flickering, and there may be horizontal and vertical lines. So, do we understand what causes the TFT-LCD screen to flicker? A TFT-LCD screen flickered on me. How should I handle the situation?

1. Because of the flashing screen, the TFT-LCD screen itself has an excessively high frequency.

However, in real life, rarely because of it, the frequency is too high and leads to equipment flashing screens. The best way is to increase the IC's OSC frequency to see how the LCD screen flickers. Of course, even if the TFT-LCD screen has a separate row and column driver, you can adjust the driver chip settings.

2. The TFT-LCD screen and the light source frequency are similar, causing flicker

This situation is very common. Due to the different frequencies of different light sources, in some special conditions, the frequency of artificial light sources close to the LCD screen flicker is very common.

3. Incorrect refresh frequency settings cause the TFT-LCD screen to flicker

When the LCD screen is not stable, this type of flashing screen, play animation, or fast switching screen may present one or two horizontal bars; the position is not fixed. Touching on two frequencies, the first is the frequency at which the CPU sends data to the RAM, and the second is the frequency at which the module's internal refresh occurs. By adjusting the repository, the refresh frequency can be adjusted to match the CPU write speed. Customers can also change the CPU write speed to match both.

4. The scanning direction does not deviate from the flickering of the TFT-LCD screen

The LCD screen flicker phenomenon and the frequency mismatch caused by the screen flicker phenomenon are very similar and do not occur very frequently. However, because there is less contact, defectives may not think in this direction about how to adjust the frequency of the still-existing phenomenon. At this point, the need to check the CPU to send data to the RAM update direction may differ from the module refresh direction.

5. Due to a mismatch in the IC refresh frequency and backlight pulse width modulation signal frequency

This condition is frequently seen in the CSTN module, and it is simple to create in the half-bright state. The reason for this is that the PWM signal switches the backlight between bright and dark states to deceive the human eye, creating the illusion of a dark backlight. The condition is that the frequency be sufficiently fast. If this frequency does not match the refresh frequency of the IC, the two frequencies may interfere, resulting in a picture that looks like water ripples. This is a common occurrence in Sitronix ICs. Because their ICs typically set the default crystal frequency lower to produce less power, this phenomenon frequently occurs in the half-bright state. Change the crystal frequency and refresh frequency to see how it affects performance. The possibility of matching increases as the crystal oscillator amplified period decreases. To harmonize the debugging, the pulse width modulation signal can be adjusted appropriately.

Causes of color differences in TFT-LCD modules

Why do TFT-LCD modules manufactured by the same company have different colors? Screen chromatic aberration typically refers to two pieces of the same model of LCD screen displaying the same screen together. There will be color differences, and the most noticeable white time will be displayed on the screen. Customers usually find a large color difference to be unacceptable. Today, I'd like to discuss the TFT-LCD module's color differences. What are the causes?

Different glass panel manufacturers produce different pieces, so that batches of glass are assembled into TFT-LCD modules after being cut into pieces of different colors. There are color differences, so if the LCD screen manufacturers use a glass panel from a different manufacturer, there will be a color difference. Even if you choose the same glass panel manufacturer but the batch of glass is different, after cutting, the color will be different, and there may also be a slight color difference.

1. Backlight source

Different batches of backlighting can also cause color variations on the LCD screen. The LED lamp beads are the main components of the backlight, and this is the display screen light that emits a bright display of the most important components. LED white light is made up of three colors, which are commonly referred to as RGB. The wavelength of the light, as well as the left and right values of the number of LED optics, will cause a reaction directly to the display effect of the LCD panel, resulting in minor differences in the TFT-LCD module color difference. As a result, different batches of backlight will cause the color of the LCD screen to vary.

2. Polarizing filter

The color of the screen will vary depending on the batch of polarizer used. A polarizer is a multi-layer polymer composite material with the function of generating a polarized light optical film. According to its different positions in the LCD module, it can be divided into two types: the face sheet and the bottom sheet. It mainly consists of a polarizing layer, a TAC layer, an adhesive, a peeling film, a protective film, and a reflective film. The polarizer will refract different colors with different angles, and the display color will be deviated. Therefore, different batches of polarizers will show color differences.

3. Voltage

The reason for the voltage Because the voltage of different batches of glass substrate will fluctuate by ±0.5V, the output voltage will be adjusted to be as consistent as possible in the production, but it is difficult to maintain consistency. to reduce the display color difference.

TFT-LCD module is a composite of multiple source components; each component will be unique due to factory batch variation, affecting the effect of the display color. Manufacturers will assist customers in considering these factors. This will be based on customer requirements, as well as the screen assembly process of precise adjustment, which can ensure that the TFT-LCD module does not appear with a larger color difference. As a result, we should pay close attention to the purchase of the TFT-LCD module with the manufacturer to communicate in advance the color range that can be accepted.

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