Are Tsingtek LCDs RoHS compliant?
  Yes, all Tsingtek LCDs are RoHS compliant.
      Are UL certifications available for Tsingtek LCDs?
            The complete LCD display module does not require UL certification, however, certain                components such as PCB and backlight wires are UL certified.


         What is the difference between a Digital TFT and a Analog TFT?

            The difference is the interface signal. The digital TFT is designed to accept digital interface signals TTL /                  LVDS. The analog TFT is designed to accept analog RGB / NTSC / PAL interface signals.


         What is the lifetime spec for a Tsingtek LCD backlight?

            The lifetime (50% of original backlight brightness) for White LED backlight is rated as high as 40K                            hours. The lifetime for CCFL backlight is rated as high as 40K hours.


         Can I control the backlight brightness?

            CCFL frame rate can be modulated for a smaller percentage of time at full voltage.
            This may cause some noise but you can have limited control of the CCFL. However LED backlight                            brightness is easier to control. It can be achieved by regulating the backlight DC- current, PWM control, or              implementing special LED drivers (IC).


         How is the brightness on a LCD module defined?

            It is the average brightness measured from 9 surface areas of the display. The surface is divided into 9                    equivalent partitions and the brightness is measured from center of each partition.


         How is the contrast ratio on a LCD module defined?

                                               Brightness measured when LCD is at "white state"

            Contrast ratio (CR) = ----------------------------------------------------------------------

                                               Brightness measured when LCD is at "black state"


         How is the resolution on a LCD module defined?

            It is the number of color pixels over the surface area of a LCD module. It is calculated by the numbers of                  pixels in the row and in the column.


         What are the standard resolutions?


‧ QVGA:  320(H)x240(V) pixel 240(H)x320(V) pixel 2.2” , 2.4” , 3.2” , 3.5” , 5.7”
‧ WQVGA: 480(H)x272(V) pixel 4.0” , 4.3” 
‧ VGA: 640(H)x480(V) pixel 5.6” , 5.7” , 10.4” 
‧ WVGA: 800(H)x480(V) pixel  5.0” , 7.0” , 10.2”
‧ SVGA: 800(H)x600(V) pixel  7.0” , 8.0” , 10.4” 



         What is LCD response time?

            Response time is the amount of time a pixel in a LCD takes to go from black to white and back to black                    again. It is measured in milliseconds (ms). Smaller values represent faster transitions and therefore                          smoother images.


         What do the RGB bits represent?

            There are three colors, red, green and blue, in a pixel. The changes of the saturation level of each color                  combine into a spectrum of colors. The saturation level can be represented by bit. The number of bits                      represents the power to 2. For example, if there are 8 bits for red, then there are 256 levels of saturation.                Therefore, when we have 24 bits in a LCD module for color representations, 8 bits are equally divided to                  red, green and blue. In this way, there can be 16.8 millions colors.


          What is TFT?

             TFT-LCD stands for thin-film transistor liquid-crystal display.
             It uses liquid crystal between to glass substrates to control the passage of light. The color filter is on the                   front glass substrate, and the back glass substrate has transistors on it. When voltage is applied, the liquid              crystal is bent and a pixel is formed by the light that passes through. The color filter on the front glass                       substrate gives each pixel its own color. The combination of these pixels in different colors forms the                       image on the panel.



             OLED stands for Organic Light Emitting Diode.
             It is a light-emitting diode (LED) whose emissive electroluminescent layer is composed of a film of organic               compounds that emit light when an electric current passes through it. This layer of organic semiconductor               material is formed between two electrodes, where at least one of the electrodes is transparent.


          What is the relation between power consumption, lifetime and brightness of OLED?

             Power consumption has a direct relation with the numbers of lighted pixels and panel’s brightness, less                   lighted pixels and lower brightness lead to lower consumption. Compare to LCD,which has backlight,                       OLED’s power consumption is much lower. The lifetime is inversely proportional to the brightness. The                     lower brightness, the longer lifetime.


          What are the advantages of OLED?

             Compared to LCD, OLED has many advantages, for example, self-emission, no backlight,wide view-                       angle, light weight, thin thickness, high contrast, fast response time, wide temperature range, good                           aseismatic ability, simple processing technology and can implement flexible display.


          Why does OLED have wide temperature operation range?

             The OLED luminescent materials are solid state, which physical characteristics are stable under different                 environment temperature. However, the liquid crystal is a special material between solid state and liquid                   state, which physical characteristics would be changed at too high or low temperature. When the liquid                     crystal physical characteristics changed ,the display effects will be seriously influenced.


          What is the difference of drive interface between OLED and LCD?

             OLED I/O interface is the same with LCD, which can easily connect in application. It can support                               8080/6800 series parallel interface, SPI and I²C interface.


          What is the difference of software between OLED and LCD?

             The software development of OLED and LCD are basically the same; our FAEs will provide reference                       code to help customers for embedded software development.


          What should be pay attention to during OLED structural designing?

             OLED’s substrate and cap are made of thin glass, so that during structural designing , PCB,shock-proof                   stuffs or structural orientation should be designed to fasten OLED module and strengthen products’                         aseismatic ability.


          How to adjust the OLED display brightness?

             The OLED display brightness can be  changed through adjusting OLED panel driving voltage and                             software code value. For details, please contact our FAEs.

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