Technology

Equipment

Quality

News

01-08

2024

Is power sequencing important?

<p>You must turn on the Vcc supply voltage, then within 10-20 milliseconds apply all of the data signals including the data bits, sync signals and clocks. If you apply the data signals before you apply power, you get into a latch-up condition. The LCD looks like a CMOS device that can draw high current if a signal is before Vcc is turned on. This makes the potential of a high current path to ground from the signal lines if Vcc is not applied before the data signals.&nbsp;</p> <p>Secondly, the display needs an AC signal to function properly. If only a DC signal is applied, damage can occur. Generally the damage occurs slowly and is a function of duration, temperature and other conditions, but the effect is cumulative and failures will eventually occur. You can also have a latch-up problem if you wait too long to apply the Sync signals.&nbsp;</p> <p>Some displays have a built-in voltage doubler. If you don&#39;t apply the clocks quickly enough, you can create another latch-up condition in the display. A power sequencing latch-up problem almost always shows up as an all white or all black display. Then, if you turn it off and back on it may start working. Latch-up conditions are almost always recoverable. The only time when permanent damage occurs is when excessive power flows through driver&rsquo;s ESD diodes.</p>

01-08

2024

How can I reduce EMI noise on my display and interface to ensure passing UL Certification requirements?

<p>The source of most noise radiation from the display comes from the synchronization clock that runs at very high speeds. On a VGA display it runs at 25 MHz. The use of small R-C circuits or inductance on the data clock can soften the edges and lower the radiation. Shielding of the connection cable is another method to reduce noise, but it tends to be more expensive. Another technique for larger displays is to use LVDS transmission systems where the TTL signals are transmitted as low voltage differential signals. This is the technique used currently in most laptops.&nbsp;</p> <p>It is also important to ground the display frame to a good AC signal ground. This helps contain the noise generated by the display as well as to become a shield for noise generated by electronics close to the display.&nbsp;</p>

01-08

2024

Are initialization codes available for TRD LCD displays?

The initialization codes can be found in the LCD specification, and or in the controller specification.

01-08

2024

What is the lifetime spec for a TRD LCD backlight?

The lifetime (50% of original backlight brightness) for White LED backlight is rated as high as 50K hours. The lifetime for CCFL backlight is rated as high as 40K hours. (Please reference individual specification for more details.)

01-08

2024

What is the temperature range for a TRD TFT LCD display?

01-08

2024

What are the viewing angles for a TRD TFT LCD display?

TRD TFT LCD displays have very wide viewing angles. Minimum horizontal view angles 50 degrees (L) / 50 degrees (R). Minimum vertical view angles 45 degrees (T) / 55 degrees (B). Please reference individual specification for more details.

< 1234 >

Tianjin Right Display Co., Ltd.

  • ADD:D2 Factory Building, No.7, East of Guwang Road, Jingbin Industrial Park, wuqing district, Tianjin

    FAX: 301712

    TEL : 022-25255909  / 18133876017

    E-mail : sales@trdisplay.com

    WeChat: 18133876017

Add Friend

All rights reserved©2023 Tianjin Right Display Co., Ltd.

SEO

License

Powered by www.300.cn