LED Drivers/LCD Bias

  
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I have a circuit (see attached) provided by an LCD manufacturer that illustrates using the POL signal from the display to derive the VCOM signal. From what i`ve read, LCD Bias ICs generate VCOM from the high bias voltage. Is it possible to instead feed the POL signal into one of these ICs to generate the VCOM signal Is there a version of these IC
LED Drivers/LCD Bias - schematic

s that provides a `discrete` opamp that can be utilized as illustrated in the attached schematic It is true that you can derive the VCOM signal from the source line signal and for the big portion of your VCOM signal this is done with the resistors connected from VDD and VGL to A+in. Then it is good practice and increases the functionality of the LCD to use as well feedback from the panel, which is done with the POL signal, I think. For sure there are parts available having VCOM buffers as well as positive and negative charge pump drivers and a boost converter integrated. You might have a look to TPS65101, TPS65146 or TPS65150. All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may...



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