Clean plant ventilation engineering controls Character LCD Modules

General plant operating environment of harmful substances generated in the generating source will spread through the propagation path of the job, and they therefore operating environment from the generating source control strategies, dissemination and acceptance of the diffusion path by three aspects of exposure to exercise control, Character LCD Module to the extent that Engineering control point of view, it is best to place the occurrence of pollutants polluting substances will be controlled by the nearest treatment, to avoid spread of harmful substances. In order to ensure the safety and health staff and good working environment, should be engineering to improve its operating environment for harmful gases, vapors or dust, etc. The improved operating environment, can be combined with one or two kinds of ways to address hazardous substances exposure hazard.
First, the overall ventilation system
Plant anti-ventilation control mode ventilation primarily as a whole (dilution ventilation) and local exhaust two main forms. Where ventilation is the most basic type of overall ventilation system, its main function is to provide fresh outside air at the workplace, workplace hazardous dilute the concentration of harmful substances and by the flow of air from the outdoors. Therefore the relationship between air and harmful substances, the overall ventilation consists of two basic mechanisms: mixing and displacement. The former so that fresh air and polluted air mixture to achieve dilution effect, the latter is replaced by the contaminated air with fresh air.lcd module  In occupational safety and health regulations, decrees concerning ventilation ventilation devices are set on the overall timing, principles and basic performance requirements vary specifications. However, the air flow pattern in the room, the ventilation performance of the overall impact of a quite significant, and often can not be certainty factor. Indoor geometric state, cubicles, equipment, furnishings, temperature, pressure distribution, intake and exhaust port configuration and human caused deliberately forced ventilation are all factors that influence indoor air.
Overall ventilation in different occasions for different interpretations and calculations. Such as to control indoor air quality (Indoor Air Quality, IAQ) as the goal, the overall ventilation is to provide fresh air to maintain proper temperature and humidity in order to achieve a comfortable purpose; while controlling operating environment is the prerequisite of fresh air dilution when ¸ places polluted air, in order to achieve the purpose of industrial safety and hygiene. As the air from the high pressure to low pressure with the flow characteristics, in order to consider the plant's distribution and airflow poorly ventilated place to avoid the accumulation of harmful substances, generally we all hope to send, mechanical ventilation are implemented and enforced by the air supply, exhaust pipe system design arrangements to dilute the concentration of harmful substances, such as properly designed on the occurrence of a small amount of low concentrations of widespread non-toxic or low toxic pollutants exclude extremely effective. ¸ pollution control effectiveness in accordance with the United States Institute of Industrial Safety and Health ACGIH (American Conference of Governmental Industrial Hygienists) study, the overall ventilation less suitable for the workplace dusts or fumes, which are usually larger because of its toxicity. If you need to use a whole lot of ventilation equipment ventilation and general dust, fume generated a large amount of speed, and therefore vulnerable to localized high concentrations of circumstances, this device can not be controlled. So this is not a ventilation system ventilation design engineers will first consider the use of the design, but this device for generating source pollution harmful or even widespread occurrence of uncertain location of the position, as a very practical in the solution. Consider different sources in different environments required overall ventilation design, we must first consider the calculation of the amount of ventilation, the current overall ventilation ventilation calculation method according to (1) the number of the operator (2) in the workplace space (3) evaporation rate is subject to limits (Threshold Limit Value, TLV) and the minimum Explosive Limit (Lower Explosive Limit, LEL) and other different conditions were estimated.

Clean engineering perception of quality requirements

Part of the decoration
An indoor ceiling
Zha ceiling
Ensure that the project:
Zha installation must be solid, no delamination, warping, fracture, missing Lenz off angle and other defects. Girder, joists (reinforcement, horizontal brace) must be installed in the correct position, securely connected, no loose.
Basic Project
⑴ Zha surface
Qualified: surface smooth, clean
Excellent: smooth surface, clean, color, pollution, anti-rust, pitting, and hammer India
⑵ seams or batten
Qualified: joints uniform width; layering straight, no warping
Excellent: seams the same width, neat; layering the same width, straight, tight joints
⑶ wood skeleton boom, main beam, joists (vertical bars, horizontal brace) Appearance
Qualified: a mild bend, but do not affect the installation; wooden boom without splitting
Good: straight, no bending, no distortion; wooden boom without splitting
⑷ filler
Qualified: materials dry thickness to meet the requirements laid
Excellent: In qualifying, based on uniform thickness
⑸ gray metal mesh lath and plaster layer
Qualified: gray lath nail knot securely, fitting in the joists (studs) on the size of the gap to meet the requirements; wire mesh nailed joints in the joists (studs) on
Good: On the basis of qualified, gray slats staggered, head seam size to meet the requirements; metal nail flat, no Alice
Tolerance Project:
Qualified: smooth surface, vertical elevation, layering, straight seams, joints height difference, layering consistent spacing and other projects to meet the allowable deviation value most parts of the
Good: the vast majority of these projects meet the allowable deviation value parts
Second, the interior wall
Install the cover panel and wood frame wall
See cover panel ceiling indoor ceiling
Third, the doors and windows
Aluminum alloy doors and windows
Ensure that the project:
Aluminum alloy doors and windows and their accessories must meet the design requirements and quality standards of the relevant provisions; aluminum windows and doors installation location, open direction, must meet the design requirements; aluminum door frames must be securely mounted; embedded parts of the number, location, laying connected Methods and preservative treatment must meet the design requirements
Basic items:
1. Doors and windows installed fan
⑴ swing casement
Qualified: closed tight, the gap substantially uniform, flexible switch
Excellent: closed tight, the gap uniform, flexible switch
⑵ sliding doors and fan
Qualified: closed tight, the gap substantially uniform, fan frame overlap with the design requirements of not less than 80%

Excellent: closed tight, uniform gap, fan amount of overlap with the frame meets the design requirements
⑶ spring leaf
Qualified: Automatic positioning accuracy, opening angle of 90 ° ± 3 °, closing time in the range of 3 ~ 15S
Excellent: Automatic positioning accuracy, opening angle of 90 ° ± 1.5 °, closing time at the range of 6 ~ 10S
2. Aluminum windows and doors accessories installation
Qualified: accessories complete the installation firm, flexible and suitable to achieve their respective functions
Excellent: accessories complete, the installation location is correct, solid, flexible application, to achieve their respective functions, correct appearance
3. Aluminum door frame and the wall to fill the gap between the quality inlay
Qualified: caulking full, packing materials meet the design requirements
Good: caulking full dense, smooth surface, smooth, without cracks, caulking materials, methods meet the design requirements
4. Appearance quality aluminum windows and doors
Qualified: surface clean, Omo no scratches, bumps, rust, coating Omo smooth, nonporous
Good: The surface clean, no scratches, bumps, no rust; adhesive smooth surface, uniform thickness, nonporous
Tolerance Project:
Qualified: door window two diagonal length difference, door frames positive side vertical levelness, double doors inside and outside the box center distance; casement window box fan with lap width difference, with the doors and windows adjacent tang cross fan end angle height difference; sliding doors opening force limit fan, window boxes or adjacent fan with fan standing seam parallel; spring leaf doors or fans with their counterparts seam between the frame stand, transverse left seam limits, doors and Ground clearance left seam, sew closed flat leaf counterparts and other projects to meet the allowable deviation value most parts of the
Good: the vast majority of these projects meet the allowable deviation value parts
Glass
Ensure that the project:
Glass tailoring the correct size,320x240 lcd module installation firm, smooth, non-loosening
Basic items:
⑴ wiping putty to fill
Qualified: plump bottom ash, putty and glass, wire mouth firmly bonded, the edge is flush with the cut mouth
Excellent: In qualifying, based on the putty into a figure eight corners, smooth surface, no cracks, pockmarked face and wrinkled skin
⑵ fixed glass nails or steel Szymborska
Qualified: nails, clips quantity, specification compliance
Good: On the basis of qualified, nails, clips putty surface is not exposed
⑶ studded wooden batten
Qualified: wooden batten and cut close to the edge of the mouth, cutting corners neatly
Excellent: wood bead rim stickers with flush cutting, cutting corners neat, tight, do not reveal the nail cap
⑷ rubber mat inlay
Qualified: rubber mat and cut mouth, glass and bead close
In qualifying, based on the neat line
⑸ glass tiles installed
Qualified: Arrange the correct position, dense mosaic
Excellent: Low Temperature Display In qualifying, based on the arrangement of uniform, neat, uniform straight seams
⑹ colored, patterned glass assembly
Qualified: color, pattern design requirements

Lighting liquid crystal TFT Display Module device

The liquid crystal display is a passive display device, itself does not light, modulated by the external light to achieve TFT Lcd Modules, so that light is a liquid crystal display applications, the key technology. Lighting is generally divided into natural lighting, external lighting settings and projection light source.
Natural lighting
The easy use of natural light, the cheapest, but also not a good way of energy, most of the time, counting, LCD portable instruments are dominated by natural light. Its natural daylighting technologies include:
(1) illumination for optimal viewing. Common perspective of different products in different directions, the direction of the liquid crystal display device optimal viewing angle can be consistent with the commonly used.
(2) try to highlight the Graphic LCD Module window. The LCD window design as much as possible up front can be.
(3) Flexible look outside light. The instrument design into a flat, handheld, easy to use when looking for outside light.
(4) to avoid light interference. For some reflection type liquid crystal display device, in addition to pay attention to find outside light, the need to avoid fluctuations in the surface of the light caused by light interference.

Connecting technology of liquid crystal TFT Display Module device

Liquid crystal COG LCD Module device by the two glass. The outer lead is attached to the surface of the transparent conductive film made of photolithography, can not use the conventional welding processes. Currently there are connection process:
1, the conductive rubber connector
This is a more traditional way. Conductive rubber strip all known as zebra conductive rubber strip is determined by a layer of conductive rubber, a layer of insulating rubber white laminated into a very thick one, and then in the direction perpendicular to the surface of the rubber strip cut into strips. When used, just outside the lead and the liquid crystal display circuit board traces correspond neatly side, the Zebra caught in the meantime, to fix them. To do this, we must make a pressure box. Pressure frame material shape can be any design, but must ensure that there is a pressing amount to about 0.2mm, the need to ensure that the pressure uniform, not bent.
2, the metal pin connector
Stamping into the metal pins, the first liquid crystal display which plug member fixed to the end of the outer lead, to the user, or when soldered or plugged into the circuit board.
These two methods more used digital type, the outer lead much (line pitch> 1.25mm or more) of the liquid crystal display device.
3, hot film flexible connection
Calculators and digital communications equipment commonly used. Its hot conductive connection with a polyester film, in the intervals of graphite printed on a thermal conductive adhesive strips and insulation. When used, the end of the alignment of the liquid crystal display device of the conductive strips of the outer lead securement, plus potential, pressure, and the other end of the conductive stripe aligned snapping lead terminal board, heat and pressure can. Since it takes a certain pressure and temperature, so users need to configure a dedicated hot press.
4, the anisotropic conductive adhesive connections
The so-called anisotropic conductive adhesive is shown in Figure 1 as a hot film. Interspersed with gold plated film in plastic balls, to be sandwiched between the LCD and PCB heat and pressure, the lead because of the thin film pressure, and connected by a conductive plastic ball, since the lead spacing, so it will not horizontal concatenation. So called anisotropic conductive connection. Also known as TAB connection. This connection can easily connect line spacing device is only 0.1mm. Is the high density and large amount of information necessary for connecting liquid crystal lcd module technology. Because it requires precision alignment and precise pressure, temperature control, you need to set the price of expensive special equipment job.
Connection with TAB method the chip directly on the liquid crystal display device on the glass COG mounting method, the pressure in the chip from the board COB hard wire and the chip mounting pressure in the flexible circuit board COF mounting.

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

Overcome cross effects Character LCD Modules

In the dynamic drive mode, to make such a position (i, j) point display, on the need in the i th column and j th row selection voltage is applied at the same time, so that the point of the maximum electric field strength, but this time in addition to (i, j) points, the i-th row and j th row of the remaining points can withstand a certain voltage, these points are called semi-selected point. If the semi-selected point of the effective voltage is greater than the threshold voltage, there appears on the screen should display the contrast decline, which is cross effects. The way to solve the cross effect is the average voltage method, that is, the semi-selected point and non-selected point average of the voltages, an appropriate increase in the non-selection voltage to offset the point on the semi-selected point of the voltage, the semi-selected point on the voltage drop, improve display contrast.
Pixel Control
Pixel by pixel register and a status bit is uniquely determined. There are 16 pixel lcd module registers to control up to 4 × 29 = 116 pixels. We use the LCD from 8 × 8 = 64 pixels. Thus, the pixel data register is sufficient.
Segment Enable
Segment code is enabled by LCDSE registers. Because VIM807-2 is eight 7-segment display, and our choice is 1/3 duty cycle (ie, three common), so by LCDSE register must choose 3 × 8 = 24 segments in order to meet the need, namely complete expression All of the code segment pixels. Of course there will be superfluous, 8 × 9 = 72, because every three commons and 3 above can express 9 pixels.
LCD drive voltage generating
LCD drive voltage is generated in two ways, the internal charge pump method or external resistor ladder network method. Since the Character LCD Module charge pump is in development, in order to reduce design risk, we use a more sophisticated method of external resistor ladder network. Using an external resistor ladder network, VGEN (LCDCON <4>) should be cleared.

LED TFT Display Module software environment

graphic lcd display module on the different properties of the display should be configured to meet the functional requirements of the display software, which has the following features:
a. comply with serialization and standardization requirements, can backward compatible;
b. using the detail specification of the operating system and language;
c. equipped with a sound self-test procedure and be equipped with various levels of diagnostic procedures;
d. PARTICULAR PURPOSE LED display with their corresponding special software.
Structure and appearance
Structure: COG LCD Display section are available in steel, aluminum, wood and other materials. Requirements rugged and beautiful.
Appearance: LED Display frame no scratches. Outdoor LED display pixel pipe installation should be the same, no loose and broken shell column.