Character LCD Modules TVs and monitors the performance difference and improve performance

National Semiconductor's design approach with the use of traditional design RDAC different. We succeeded in developing a linear cyclic DAC column driver. Because of this DAC smaller die area, each output can install two identical DAC, one each for each electrode. When one of the digital to analog converter converts the input data is kept for the next line when using just one analog converter has been used in the line voltage has changed this line driving current. The main characteristics of this DAC through flexible adjustment function can improve the accuracy of location. To increase the degree of resolution, simply increase the operating cycle of the same analog converter circuit can be, without increasing die size. As we adopt this structure, it is possible in a cost-effective basis, using smaller die provides 10-bit grayscale. A typical 10-bit point-to-point differential signaling (PPDS) column driver only die size than typical 8-bit RDAC little more than half of the column drivers.

Another advantage of this design is to convert digital to analog converter circuit is no longer responsible for enforcing anti-gamma functions. In other words, each column driver output voltage value can be directly converted to the digital value of the analog voltage. Located in the upper reaches of the timing controller (TCON) is responsible for the digital gray level to a digital voltage. That is, the timing controller is responsible for the enforcement of anti-gamma lookup table function, this design is more flexible, so that each can be mapped with gray-scale LCD monitor brightness. Indeed, the timing controller can provide different colors for each of the lookup table, or even real-time updates on the chart to allow for different image sources, contrast enhancement, color management, as well as to adapt to changes in temperature make the adjustment.
Column driver configuration is the PPDS (see Figure 2) part of the structure. As the name implies, PPDS is not a multi-drop bus transport, but by multiple independent point-to-point link consisting of line system for each column driver provides a channel. This channel can transmit control data column drivers and digital voltage data, while the column driver will these digital voltage data into analog voltage data. In a conventional bus structure using burst mode data transfer to the column drivers, and at the same time, only one column driver is able to receive data, because the bus is shared. The use PPDS architecture, all the column drivers can receive data simultaneously. Therefore, even if only one differential channel for each column driver provides data channels but can be used within the whole period. Therefore, these two systems are very different clock frequencies. 128x64 lcd module
PPDS system is one of the important feature is that each column can be sent through line by line drive data header control each column driver, respectively. This structure must be such embedded control, because the only way the column drivers and timing controller can send each individual without a dedicated signal helps reduce system size and cost savings. Since the system can be flexibly controlled column drivers, so be able to perform a special waveform control functions. To drive the big screen TV, it must control the drive flat-panel displays waveforms in order to achieve the best signal propagation effects and improve the pixel charging rate (pixelchargingratio).
Since the timing controller is capable of respectively red, green and blue gamma separate look-up table, it can be corrected accurately the color temperature of each gray level. Because RGB gamma lookup tables are separate, so that each color are available independent gamma correction, so for all gray levels provide a fixed color temperature, but also can expand the scope of application of this technology to high-performance systems. Since the timing controller directly to the gamma lookup table can be accessed, so different elements can be flexibly adjusted in real time in response to the gamma correction function by adjusting the size of the amplitude of the timing controller determines the image processing unit. Generation of configuration that can be different display window provides different gamma transfer function. Computer operating system timing controller provides a window for the boundary coordinates, then the command to be written to the timing controller according to different display area select a different gamma lookup table.
Production of large-screen TV manufacturers are trying to produce results comparable to theater products. To ensure that the effects can be comparable to the cinema screen, grayscale and color management accuracy soundness are key to success. From the input to the output of the process of the entire display, PPDS architecture can support 30 full color accuracy, plus independent gamma lookup table provides a variety of functions, so the effect of image processing can be increased dramatically. Further, since the image contrast in color and brightness for enhanced, so more accurate grayscale of the image. As independent gamma lookup tables have their own settings, so you can directly control the image effects, without the use of color enhancement or other way to achieve the requirements of the brightness of each pixel. 122x32 lcd module
The system monitors and notebook display, the liquid crystal display module receives the gray-level instructions, and provide control signals for the flat panel display in order to generate the desired gray level. The TV's requirements are different, the circuit should take into account the screen effects, such as enhanced color depth, improved color balance, dynamic contrast enhancement, providing response time compensation, and color temperature control.