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1、英文原文LCD Design GuideThe following sections provide basic information on LCD glass and LCD modules, which is useful when you start designing your own LCD or submit requests to LCD manufacturers.Types of LCD Products - Glass or Modules The most fundamental decision to make is whether the display will
2、have the drive circuitry attached (module), or not (glass only). There are advantages and disadvantages to each approach. When purchasing a Custom LCD Module, the basic electronic design work will be done by the manufacturer. This obviously saves design time and reduces the manpower needed to bring
3、a product to market. You can benefit from the experience we have gained during our previous designs to shorten the design cycle and deliver an optimized product. The major decisions you need to make are the interface type, with standard serial or parallel interfaces being the most common, and the ty
4、pe of integrated backlighting desired. The temperature range, viewing angle, viewing mode, and contrast will need to be considered, but those decisions are common to both approaches. A glass only design puts the design burden on the end user. You will need to learn a great deal about LCDs in order t
5、o complete your design. Luckily, our website provides Application Information and Web Links to assist you in the search for the information you may need. The main reasons to buy just the LCD glass are to reduce costs, and provide design flexibility. The total cost of the components necessary to buil
6、d the drive circuitry is typically less than the cost of a pre-built module, and as long as you have space on your existing PC board, you wont have to pay for an extra PC board on which to mount the display, and have access to cost effective assembly and test. By doing a little homework, your design
7、 will work just as well as a module, and will allow the flexibility most designers need to adapt their design to ever changing demands.Types of LCD Images The LCD can contain character icons, segments, graphic dot arrays, or any combination.Icons: By making a custom LCD, you can place images on the
8、glass that specifically complement your produce, these are called Icons. These silhouettes can take the shape of any image you may need and count as one pixel or dot on the LCD. Segments: Segments on an LCD display make up a larger character, such as a segment in a seven segment numeric character (d
9、isplays 0-9), or a segment in a 14 segment alpha-numeric character (displays 0-9 & A-Z).Dot Arrays: These dot arrays can be made in almost any size and dot count. Examples would be character displays that use a series of 5x7 dot arrays to create a string of alphanumeric characters, or the larger 320
10、 x 240 graphic arrays that make images along with variable size alpha-numeric characters. Types of Liquid and Technology The type of technology used is determined by the specific performance requirements you set for the display that you are designing. Since several variations will do a fine job, the
11、 ultimate consideration is cost. So here is a quick breakdown of the technologies we offer.TN: Low production and NRE costs, poor viewing angle, average contrast. Coloration: Black on Gray. Static preferred, but operates well up to a 32:1 Multiplex rate. LCD Glass favorite.STN: Medium production and
12、 NRE costs, average viewing angle, average contrast. Coloration Black on Green, or Dark Blue on Gray. Works well at high Multiplex rates. LCD Module favorite,high end LCD glass choice.FSTN: Medium high production and NRE costs. Good viewing angle, excellent contrast. Coloration Black on White. Works
13、 well at high Multiplex rates. Higher end LCD Module favorite.Negative Image: This is an effect that reverses the image on the display and is only offered with transmissive displays. The visual effect is to allow the backlight to define the pixels turned on (transparent), while the off pixels remain
14、 opaque. This configuration works best in moderate to low light conditions.Viewing Mode and Polarizers The viewing mode is controlled by the rear polarizer, and how much it does or does not reflect light. We offer three modes.Reflective: This type of polarizer gives the display the brightest appeara
15、nce in high to moderate ambient light conditions, with the highest contrast ratio possible. Unfortunately, it will be difficult to read at night or under changing lightning conditions (think Game Boy).Transflective: (Favorite solution) If your display must be readable under a wide range of lighting
16、conditions, you will generally want a transflective display so that it will look very good in the bright sunlight, but will also be back-lightable at twilight and at night. The tradeoff with a transflective display is that it will not look as good as a reflective display during the day, and it will not look as good as a transmissive display at night. It will however enable you to have an acceptable compromise between the two
