Response time of liquid crystal TFT Display Module

The so-called reaction time of each pixel LCD display of the input signal reaction speed, ie the pixels from dark to bright or dim light by the time needed ( the principle is the voltage applied to the liquid crystal molecules of the liquid crystal molecules twist and replies ) . Often say 25ms, 16ms is referring to the reaction time, the shorter the time to see if the user does not have a more dynamic picture shadow tail dragging feeling. The reaction time is generally divided into two parts: the rise time (Risetime) and fall time (Falltime), which means that when the sum of both prevail.



CRT monitors , as long as the electron beam hitting phosphor instantly luminous , while the residual glow very short time , so the traditional CRT monitors response time of only 1 ~ 3ms. Therefore, the reaction time in the CRT display is generally not been mentioned. And because the LCD display is the use of liquid crystal molecules twist control light off, while reversing the liquid crystal molecules is a process, so the response time is significantly longer than the liquid crystal display CRT.

25ms to 12ms from the early well-known 16ms then recently appeared , the reaction time is continuously shortened stereotypes are not suitable for liquid crystal displays and entertainment are being huge challenge. You can do a simple conversion : 30 ms = 1/0.030 = 33 per second display screen ; 25 ms = 1/0.025 = 40 per second display screen ;OLED Display 16 ms = 1/0.016 = 63 per display frames ; 12 ms = 1/0.012 = 83 per second display screen . As can be seen the birth of a great progress means 12ms LCD manufacture.

It should be noted that the LCD display has a scanning frequency of restrictions , especially for field frequency ( also known as refresh rate ) , many of which are limited to 75Hz or less , but in terms of general concepts , 75Hz refresh 75 means one second screen looks like this reach 12ms frames per second, corresponding to a 83 .

In fact , we said above, the 12ms response time is the time for switching between black and white screen required , this full white drive voltage required to switch the black screen is relatively high , it is more switching speed fast , up to 12ms; most of the practical applications of the switching gray screen ( LCD and its essence is not completely reversed , incomplete light transmission ) , the required driving voltage is relatively low , the switching speed is relatively slow. So together, in the gray screen refresh rate of 75Hz 12ms has to meet the needs of the Lcd display module .

According to the data showed that:
Reaction time = 30 ms = 1/0.030 per second display screen can display 33 , which is already able to meet the needs of DVD playback ;
Reaction time = 25 ms = 1/0.025 per second monitor can display 40 images, a DVD player and fully meet the needs of the majority of the game ;
While playing the kind of intense action game ( eg QUAKEIII/UT2003/DOMMIII), Speed ​​Pursuit and other games to be achieved if there is no ghosting , the screen displays the desired reaction time at 60 frames per second, the speed should be more than that required = 1 / 60 frames per second display screen capable of displaying = 16.6 ms.

Low TFT-Character LCD Modules technology introduction

Low-temperature polysilicon thin film transistors (polysilicon TFT) technology for high-definition LCD remains hopeful, but just want to process engineers have driven approach to improve the structure and the job today, South Korea, a company invented a technology that can speed up ratio ever brighter, higher-resolution monitor the launch. 256x64 oled

In the traditional design of active matrix LCD, the thin film transistor is made of amorphous silicon (a-Si) formed. Produced by the switching transistor is used as each pixel. These designs require personal computer can convert the signal into a suitable control of the display and pixel amplitudes of additional circuitry. Because conventional transistors can not be used to drive the pixel switches, IC manufacturers must be added to the customer's driver and scan functions screen. Amorphous silicon transistors also limits the size and functionality of the lighting per square inch can be the number of pixels. Result, today's PC using a-Si TFT LCD with every square inch from 60-90 pixels (PPi) range of pixel density. Although access to high resolution of about 200PPi a-Si TFT-LCD has few, if using an external driver IC, there will be constrained to limit the production of these displays commercial possibilities.
On the other hand, has been able to produce more than 200PPi resolution low-temperature polysilicon (LTPS) TFT-LCD to. For comparison purposes, consider the typical human eye is able to analyze the highest resolution about 350PPI. Better because the process can be eliminated and the display driver IC difference between the thousands of tape automated bonding, which can reduce the cost and improve the reliability of the display. SPI oled