LCD oled module design should pay attention to several issues

With the rapid development of information industry, as one of the terminals of the LCD information display device has also been an unprecedented development. In the FPD (Flat panel display) devices, LCD with its light, thin, small, and low power consumption and thriving.
For LCD driver circuit is configured to form a LCD module LCM (Liquid Crystal Module). In addition to its basic component parts LCD, driver circuit and connector outer Usually, backlight. TFT LCD Display in the same system as other circuits, has a simple interface, and provides a wealth of control display instruction system.
Contrast
Contrast is the description of a display device in the display when the foreground (such as display text, graphics, etc.) and the difference in brightness between the background the size of a volume.
● driving waveform to improve
As a general module circuit design is relatively simple, no electromagnetic interference analysis. However, the product at high duty cycles, the oscilloscope can be found in the chip of the output waveform tends to become poor, the contrast of the display which have a certain extent. In order to change this situation, each resistor in the bias circuit capacitor in parallel with a 0.1μF can improve the output waveform.
To output B-wave chips COM line as an example. In the absence of additional capacitance and a half before the selection point selection point voltage waveform has distortion, distortion can cause severe crosstalk display contrast, the waveform shown in Figure 2. Increase the capacitance, the waveform would have been greatly improved.
● Working frequency problem
In actual debugging a display capacity of 128 × 64 dot matrix display module samples, discovery module in interlaced OLED Display Module, the display was pale, contrast is poor. The analysis that there are two ways to solve. First, adjust the module RC oscillator circuit, reducing the resistance R, the oscillation frequency is increased from 47kHz down to 20kHz; Second, in the bias circuit section to be the driving circuit (as described above). Both approaches achieve the desired effect. But the first approach due to lower operating frequency module, which will display the frequency is also reduced Zhen, which resulted in the entire LCD screen display when the same as the TV screen flicker generated phenomenon, which under fluorescent light observation easier to find, but in natural light or incandescent display is pretty ideal, in the actual commissioning according to the actual situation, select the