This phenomenon is usually the problem of the PCB

To troubleshoot, first of all have a certain understanding of the module, so that repair from the module in order to play a multiplier effect.
<1> troubleshooting prerequisites:
① assembled to master certain lcd module skills, mastered certain skills in troubleshooting, can be handy, reduce assembly problems.
② To constitute modules have a certain understanding. A module, in order to have good electrical display, shell, screen, zebra, PCB board must be designed, qualified raw materials in order to receive good results. Such as: zebra compression ratio enough, resulting in lack of planning, this situation is repeated assembly, reliability display lcd 16x2 does not work, then we should change the zebra.
③ To the assembled modules to the principles of the modules have some understanding of the problem so that after assembly of the module will be targeted. Such as: When on a PCB, chip pin control panel two SEG electrodes, once discovered missing two SEG symmetry appears on the module, it can be concluded that the problem of the PCB
Semi-deep half-light, do not walk, program exceptions, less of a screen or a few screen when not in tune, there are shadows, etc. This phenomenon is usually the problem of the PCB, you need to remove the PCB test PCB board. Reassembly with a good PCB board.

Principle OLED display module is the backlight unit issued uniform surface light

  Power terminal, instruments and other display components is oled display module, its status is equivalent to the CRT tube. OLED display module is divided into screen and backlight components. The two parts are assembled together, but when the work is independent. Principle OLED display module is the backlight unit issued uniform surface light, the light transmitted OLED Display Module  the LCD screen in our eyes. Role OLED display module panel is light in pixels of the processing to display an image. OLED display module simple point that is screen, backlit panels, PCB board, iron box. OLED display module manufacturing selected control IC, filter and directed film accessories. Contrast is very important, arguably a more important indicator OLED Display  the highlights of selected LCD, when you know your customers to buy the LCD is used for entertainment watching DVDs, you can emphasize the contrast is more important than no dead pixels, we look at when streaming, the general brightness sources for little, but to see chiaroscuro character scenes, gray hair texture changes to black, to rely on the level of contrast to visualize the.

LCD module displays simple point that is screen, backlit panels, PCB board, iron box

 Principle lcd module displays a backlight unit issued uniform surface light, the light transmitted through the LCD screen in our eyes. The screen in pixels is the role of these light processing to display an image. Two parts contain large number of components. Lcd module displays the manufacture of selected control IC, filters and accessories directed film, the contrast with the panel related to the general user, the contrast can reach  one is enough, but this is also in the professional field the contrast level can not meet the needs of users. CRT monitors relatively easily reach TFT Display Module  contrast ratio even higher terms. Only high-end LCD monitors in order to achieve this such an extent, because the contrast is difficult to accurately measured by the instrument, so pick a time or to personally go to the job. LCD is a substance that is between the solid and liquid itself is not light, and requires the use of an additional light source to the job. Therefore, graphic lcd display module  relationship between the number of lamp LCD monitor brightness. The first LCD monitor only down two lamp, to the present, universal minimum is four lights, high-end six lights. Four lamp design placed into three forms: one is the four sides each have a lamp, but the drawback is in the middle there will be shadows, the solution is on the way from the lower level of the four lamps arranged, the last one is placed in the form of a "U" is in fact a disguised produced two lights two lamps. Six lamp design actually used three tubes, manufacturers will have three tubes bent "U" type, and then placed in parallel to achieve the six lamp effect.lcd module displays simple point that is screen, backlit panels, PCB board, iron box.

lcd module Introduction and principles

 LCD module simple point that is screen and backlight components. LCD TV display unit is a liquid crystal module, its status is equivalent to the CRT tube. The other part includes a power supply circuit, a signal processing circuit, etc., and of course the housing or something. The main screen is divided into modules and backlight components. The two parts are assembled together, but when the work is independent of (Character LCD Modules , the circuit is not relevant). Principle of LCD backlight unit is uniform surface emitted light, the light transmitted through the LCD screen of our eyes. The screen in pixels is the role of these light processing to display an image. When the liquid crystal panel manufacturing selected control IC, filters and accessories directed film, the contrast with the panel about the relative CRT monitors easily reach 500: 1 contrast ratio even higher in terms. Only high-end LCD monitors in order to achieve this such an extent. LCD is a TFT Lcd Modules  that is between the solid and liquid itself is not light, and requires the use of an additional light source to the job. Therefore, the relationship between the number of lamp LCD monitor brightness. The first LCD monitor only down two lamp, to the present, universal minimum is four lights, high-end six lights. Four lamp design placed into three forms: one is the four sides each have a lamp, but the drawback is in the middle there will be shadows, the solution is on the way from the lower level of the four lamps arranged, the last one is placed in the form of a "U" is in fact a disguised produced two lights two lamps.

Lcd module displays the briefing note

  Principle Lcd module displays a backlight unit issued uniform surface light, the light transmitted through the LCD screen in our eyes. The screen in pixels is the role of these light processing to display an image. Two parts contain large number of components. Lcd module displays the manufacture of selected control IC, filters and accessories directed film, the contrast with the panel related to the general user, the contrast can reach 350: one is enough, but this is also in the professional field the contrast COG LCD Display  can not meet the needs of users. CRT monitors relatively easily reach 500: 1 contrast ratio even higher terms. Only high-end LCD monitors in order to achieve this such an extent, because the contrast is difficult to accurately measured by the instrument, so pick a time or to personally go to the job. LCD is a substance that is between the solid and liquid itself is not light, and requires the use of an additional light source to the job. Therefore, the relationship I2C Lcd Module the number of lamp LCD monitor brightness. The first LCD monitor only down two lamp, to the present, universal minimum is four lights, high-end six lights. Four lamp design placed into three forms: one is the four sides each have a lamp, but the drawback is in the middle there will be shadows, the solution is on the way from the lower level of the four lamps arranged, the last one is placed in the form of a "U" is in fact a disguised produced two lights two lamps. Six lamp design actually used three tubes, manufacturers will have three tubes bent "U" type, and then placed in parallel to achieve the six lamp effect.

lcd module displays can automatically adjust the brightness of lights

Since last year, the Haikou Municipal Engineering maintenance company will Haifu, White Dragon Road, Guangdong Road and other roads 400W 250W street lights replaced all energy-efficient lamps, 1000W's switch from 400W, these are the new generation of high-pressure 20x4 lcd sodium lamps, matching new electronic vibration converter, can automatically adjust the brightness of lights, such as late at night due lcd module displays to less electricity voltage is increased, the flow is regulated by an electronic oscillator power is reduced brightness. In a move to ensure that the next major urban roads does not reduce the brightness Coding System lcd module of streetlights premise, to achieve energy-saving more than 40%.Haikou Municipal Engineering maintenance company is also responsible for the custody of more than 140 buildings landscape lighting, landscape lighting facilities in all of these energy-efficient LED cold light source, the company strictly control the lighting lcd module displays landscape lighting facilities run time, just before opening night at the holidays, night time lighting for 3 hours. To alleviate the current power shortage situation Hainan, the company has now requested the electricity sector, all closed city landscape lighting tube to September.

showing the stability of the lcd module displays the power supply design

control commands via the interface is input to the control command decoder decodes the command, and then outputs the clock, horizontal sync, vertical sync signal, thereby controlling the oscillation frequency of the OLED display, the ranks of the display device, and a COG LCD Display voltage conversion module OLED display contents offset drive module; if the display data (128 × 64bits), then the display data to the control circuit via GDDRAM MCU interface input buffer, then the local color decoder decodes the data, and finally displays the decoded data through the line driver to drive lcd module displays showing the stability of the Serial display modules the power supply design
Hardware architecture design diagram shown in Figure 2, the external hardware circuit DC-DC converter uses TPS7333 chip 3.3V to 5V power into power, and the power signal output voltage and current through the entire SSD1303 controller voltage and current. The entire system needs 3.3V and 12V power supply, MCU (paper, C8051F023) requires a supply voltage of 3.3V, OLED requires 3.3V logic supply voltage and a driving power supply 9 ~ 12V, the voltage of the driving power from an external power converter circuits.