LED Drivers/LCD Bias

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dot correction
Related Posts

  • Forum Post: Re: TLC5951

    Michael Day
    The TLC5951 provides the user with a lot of flexibility. The different features can be used for different things. Some of the features and their intended purpose are listed below. 24 Channel. This allows you to drive 8 pixels (a red, a green, and a blue LED) with a single IC. Most people use the 24...
    on Jan 18, 2010

  • Wiki Page: TLC5940 - How do you manage dot correction when paralleling outputs?

    Michael Day
    Q: TLC5940 - How do you manage dot correction when paralleling outputs? by 1166427 Question/Problem: How do you manage dot correction when paralleling outputs? Answer: First, I do not recommend this because the currents will not be matched due to differing drops in the diode. Dot correction...
    on Mar 30, 2010

  • Forum Post: Re: Dot correction on the TLC5940

    Michael Day
    You should be able to see the difference between dot correction and grayscale by looking at the diode voltage and current on an oscilloscope. Grayscale dimming turns the LED on for some percentage of the display frame. Example, if you program the grayscale register with 2048, the LED will be on for 2048...
    on May 10, 2010

  • Forum Post: Re: TLC5941 to MPU timing madness

    Brigitte
    Hello Chuck, Let me try to answer your questions: 1. Calculation is almost correct, just some time for XLAT and BLANK has to be there, which increases the data transfer speed. 2. The e xtra clock is just needed once after all bits are clocked through the 4 series parts. So for clocking in the...
    on Oct 19, 2010

  • Forum Post: Updating TLC5940 Dot Correction

    Samuel Loho
    Hi, I am working on a project involving TLC5940 chip and i have a question regarding the dot correction mode on the chip. I am aware that the dot correction register must be set at the power up if I were to use the dot correction value stored on the register. Is it possible to update the register...
    on Jan 6, 2011

  • Forum Post: Re: Updating TLC5940 Dot Correction

    Michael Day
    You can change the TLC5940 (and all other TLC59xx products with dot correction build to date) at any time. The conditions for changing dot correction at power up are the same as changing dot correction at any other time. Figure 15 shows the correct sequence. You should look in detail at the timing of...
    on Jan 6, 2011

  • Forum Post: TLC59401/TLC5941 use without GSCLK

    Matthieu Narbonne
    Hello, We are worried about using this LED driver . Can you confirm that the following installation ( and use) is possible : - Vcc : 5V - Riref : 2kohm for Imax 20mA - TEST : routed on Vcc - MODE : routed on Vcc - GSCLK : routed on GND - SCLK : pin_cpu - INS : pin_cpu - SOUT : pin_cpu - XLAT : pin_cpu...
    on Feb 21, 2011

  • Forum Post: Re: TLC59401/TLC5941 use without GSCLK

    Brigitte
    Hello Matthieu, Sorry, but the GSCLK is absolutely needed for this part. The part just turns on the outputs, if a GSCLK is connected. In addition, there are no default values for the gray scale register, therefore your connection will not work. Please have a look at TLC5947 which has 24 channels...
    on Feb 21, 2011

  • Forum Post: Re: TLC59401/TLC5941 use without GSCLK

    Brigitte
    Hello Iko, Do I understand right that you initialize greyscale with all outputs on? How are you doing this? After startup the values in the grayscale register are random and therefore I wonder how you turn on all outputs at the same time. If your initialization works fine and you are able to turn...
    on Mar 30, 2011

  • Forum Post: Application for dimming white LEDs on multiple channels

    Todd Larson
    I have an application for dimming white LEDs on multiple channels. I have tried using the TLC5940 with 16 channels with dot correction and grayscale PWM with some success. Generating the GS clock is messy at best. If a 25MHz internal oscillator was provided for the GS clock, this would be a nearly perfect...
    on Apr 12, 2011

  • Forum Post: Re: Using TLC59401 without PWM and with minimum of control signals.

    Brigitte
    Hello Catalin, Please excuse the extremely late response to your question. The GS register is random after power on, therefore if you want to make sure that all LEDs turn on, you need to program GS register after power up once. Then you can use the 1-wire method to turn the outputs on and off and...
    on Jun 3, 2011

  • Forum Post: Re: Using tlc5940 product as constant and similar current drive for multiple leds

    Brigitte
    Hello Ammar, There are LEDs on the market that are preselected to make sure that the fit relatively close to each other in brightness. The closer they fit, the more expensive the LEDs are. Therefore for screens where each LED is controlled individually by a current sink, dot correction is the better...
    on Nov 10, 2011

  • Forum Post: Re: TLC5940 in series with parallel outputs and heat

    Brigitte
    Hello Aaron, It depends on what you want to achieve. Do you want to reduce the power for a long period of time or just for a short time? For a long period of time, I would suggest to use the dot correction to reduce the power and then I would set both outputs to 50% to limit the power dissipation...
    on Feb 29, 2012

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