UM10764 Vertical Alignment (VA) displays and NXP LCD drivers
Contents
1. 4 NXPLCD drivers meet the VA requirements Regardless of the manufacturer NXP expanded its LCD drivers portfolio in order to meet the strictest VA requirements in the industry See Figure 4 Frame Frequency 300Hz 200Hz 100Hz 2V 4V 6V 8V 10V 12V 14V 16V 18V VLCD amp Redesigned products pin to pin compatible with their predecessors e Latest Generation New Products Fig 4 NXP LCD drivers re designed for VA displays From one side all the new Chip On Glass COG and packaged LCD drivers have been specifically designed to drive the VA displays The maximum value of the Vicp voltage has been increased to 9 0 V in the drivers with multiplex drive mode up to 1 8 to 12 V in the drivers with multiplex drive mode up to 1 9 PCA8538UG and to 16 V in the drivers with multiplex drive mode up to 1 18 PCA8539DUG Similarly the frame frequency has been designed programmable in a wider range typically from 60 Hz up to 300 Hz or even up to 360 Hz as in the drivers with multiplex rate up to 1 18 UM10764 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 6 of 12 NXP Semiconductors UM10764 Vertical Alignment VA displays and NXP LCD drivers Fig 5 Displays of the demo boards driven by the PCA8538 and PCA8539 PCASS39 Tr 3705 From the other side the existing LCD drivers h2. loss of data or information and the like arising out the use of or inability to use the product whether or not based on tort including negligence strict liability breach of contract breach of warranty or any other theory even if advised of the possibility of such damages Notwithstanding any damages that customer might incur for any reason whatsoever including without limitation all damages referenced above and all direct or general damages the entire liability of NXP Semiconductors its affiliates and their suppliers and customer s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars US 5 00 The foregoing limitations exclusions and disclaimers shall apply to the maximum extent permitted by applicable law even if any remedy fails of its essential purpose 6 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 9 of 12 NXP Semiconductors U M1 0764 Vertical Alignment VA displays and NXP LCD drivers 7 Tables Table 1 Existing NXP products upgraded to meet the VA display requirements 2 05 7 UM10764 All information provided in this document is subject to legal disclaimer
3. to any default damage costs or problem which is based on any weakness or default in the customer s applications or products or the application or use by customer s third party customer s Customer is responsible for doing all necessary testing for the customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer s third party customer s NXP does not accept any liability in this respect Export control This document as well as the item s described herein may be subject to export control regulations Export might require a prior authorization from competent authorities Evaluation products This product is provided on an as is and with all faults basis for evaluation purposes only NXP Semiconductors its affiliates and their suppliers expressly disclaim all warranties whether express implied or statutory including but not limited to the implied warranties of non infringement merchantability and fitness for a particular purpose The entire risk as to the quality or arising out of the use or performance of this product remains with customer In no event shall NXP Semiconductors its affiliates or their suppliers be liable to customer for any special indirect consequential punitive or incidental damages including without limitation damages for loss of business business interruption loss of use
4. NXP monochrome LCD drivers 2 PCA85232U LCD driver for low multiplex rates Data sheet 3 _PCA85233 Universal LCD driver for low multiplex rates Data sheet 4 PCA8576F Automotive LCD driver for low multiplex rates Data sheet 5 PCF21219 LCD controllers drivers Data sheet 6 PCA85262 32 x 4 automotive LCD driver for low multiplex rates Data sheet 7 PCA85276 Automotive LCD driver for low multiplex rates Data sheet 8 R_10015 Chip On Glass COG a cost effective and reliable technology for LCD displays UM10764 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 8 of 12 NXP Semiconductors UM10764 6 Legal information Vertical Alignment VA displays and NXP LCD drivers 6 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 6 2 Disclaimers Limited warranty and liability Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied a
5. UM10764 Vertical Alignment VA displays and NXP LCD drivers Rev 1 11 November 2013 User manual Document information Info Content Keywords Vertical Alignment Twisted Nematic LCD PCA85232U PCA85233UG PCA8576FUG PCF21219DUGR PCA85262ATT PCA85276ATT Abstract Compared to the traditional Twisted Nematic TN displays VA displays have deeper black back ground color much higher contrast ratio much wider viewing angle and better image quality at extreme temperatures However the VA display technology has stronger requirements for the display drivers than the TN displays mainly in terms of higher LCD supply voltage Vicp and or higher frame frequency ff NXP has extended their LCD driver portfolio to specifically drive Vertical Alignment VA displays NXP Semiconductors U M1 0764 Vertical Alignment VA displays and NXP LCD drivers Revision history Rev Date Description v 1 20131111 new user manual first revision Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10764 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 2 of 12 NXP Semiconductors UM1 0764 Vertical Alignment VA displays and NXP LCD drivers 1 Introduction NXP extended the LCD drivers to specifically
6. ave been upgraded with new versions which are pin to pin compatible with their respective predecessors but delivering higher Vicp and or higher frame frequency In such a way the customers can easily replace the existing NXP LCD drivers with the new ones This allows the usage of the better performing VA displays with no or minimal hardware and software changes Table 1 lists the NXP products upgraded to meet the VA display requirements Table 1 Existing NXP products upgraded to meet the VA display requirements New NXP Predecessor Package Maximum Vicpimax V ftr typica HZ Notes product product resolution PCA85232U PCA85132U COG 4x 160 8 0 117 to 176 ftr programmable in production PCA85233UG PCA85133U COG 4 x 80 8 0 150 to 220 ftr programmable in production PCA8576FUG PCA8576DU COG 4x 40 8 0 200 Up to 105 C release Nov 2013 PCF21219DUGR PCF2119RU COG 2 lines x 16 6 5 200 Internal Vicp characters Release Jan 2014 PCA85262ATT PCA85162T TSSOP48 4 x 32 8 0 200 Up to 105 C release Dec 2013 PCA85276ATT PCA85176T TSSOP56 4x 40 8 0 200 Up to 105 C release Dec 2013 UM10764 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 7 of 12 NXP Semiconductors U M1 0764 Vertical Alignment VA displays and NXP LCD drivers 5 References 1 AN10170 Design guidelines for COG modules with
7. document and the product s described herein have been included in section Legal information NXP B V 2013 All rights reserved For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 11 November 2013 Document identifier UM10764
8. drive the high contrast true black background and wide viewing angle Vertical Alignment VA displays 2 Vertical Alignment display technology Vertical Alignment VA is a display technology in which the liquid crystals naturally align vertically to the glass substrates homeotropic alignment When no voltage is applied the polarized light passes through the cell without a change in polarization and the light is completely blocked by the second polarizer set at 90 to the first creating a perfectly black state When voltage is applied the LC molecules rotate to a horizontal position allowing light to pass through and create a white display image Segment off state dark on state bright AAAA Glass HM Polarizer B oientation JIJ I ITO Layer transparent Electrode direction of surface treatment B Liquid Crystal incident light Fig 1 Vertical Alignment display technology 3 Vertical Alignment VA compared to Twisted Nematic TN displays UM10764 In the traditional Twisted Nematic TN displays the alignment layers used in the top and bottom glasses are oriented orthogonal to each other creating a 90 twist of the LCD molecules The polarized light passes through the LC medium where is twisted due to the wave guiding of the LC and passes through the top polarizer also called analyzer creating a bright state this configuration is also called the normally white mode as opposed to the n
9. ms or equipment nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors and its suppliers accept no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification UM10764 All information provided in this document is subject to legal disclaimers Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product design It is customer s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned application and use of customer s third party customer s Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products NXP Semiconductors does not accept any liability related
10. ormally black mode in which the polarizer are placed in parallel position Upon application of an electric field the LC molecules align parallel to the electric field All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 3 of 12 NXP Semiconductors U M1 0764 UM10764 Vertical Alignment VA displays and NXP LCD drivers due to their dielectric anisotropy and the wave guiding nature of the LC medium is lost Thus the polarized light from the first polarizer remains unchanged and is blocked by the analyzer creating the black state Segment off state bright on state dark a A a A 1 1 1 1 1 1 A N Glass HE Polarizer B orientation I iTO Layer transparent Electrode direction of surface treatment B Liquid Crystal incident light Fig 2 Twisted Nematic display technology Compared to the traditional Twisted Nematic TN displays VA displays have deeper black back ground color much higher contrast ratio much wider viewing angle and better image quality at extreme temperatures This new break through display technology is particularly well suited for applications where the display is 1 exposed to sunlight i e needs to be readable in sunlight 2 is mounted on a black background e g in instrument clusters in the car or 3 is located sideways from the viewer e g in the center
11. s NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 10 of 12 NXP Semiconductors U M1 0764 Vertical Alignment VA displays and NXP LCD drivers 8 Figures Fig1 Vertical Alignment display technology 3 Fig 2 Twisted Nematic display technology 4 Fig 3 VA display requirements 05 5 Fig 4 NXP LCD drivers re designed for VA displays 6 Fig 5 Displays of the demo boards driven by the PCA8538 and PCA8539 25 2s sp dct Soak nae E ate Saa ete 7 UM10764 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 11 of 12 NXP Semiconductors UM1 0764 Vertical Alignment VA displays and NXP LCD drivers 9 Contents 1 Introduction sidaning eee cee da ee 3 2 Vertical Alignment display technology 3 3 Vertical Alignment VA compared to Twisted Nematic TN displayS 00eeeee 3 4 NXP LCD drivers meet the VA requirements 6 5 References 2000 cece eee eee 8 6 Legal information 00 00 c eee eee 9 6 1 Definitions es ftv eae de are Greta 9 6 2 DISCI IMGFS 2 5 2 gasgen e gan gaat hacks as 9 6 3 Trademarks 000 cee 9 7 TableS sccusoasisesei sores os etdweusced 10 8 FIQUICS tiitccceee ene eee ranir eee we 11 9 CONMENIS o scdincctsswte ce deine nnna 12 Please be aware that important notices concerning this
12. s to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information NXP Semiconductors takes no responsibility for the content in this document if provided by an information source outside of NXP Semiconductors In no event shall NXP Semiconductors be liable for any indirect incidental punitive special or consequential damages including without limitation lost profits lost savings business interruption costs related to the removal or replacement of any products or rework charges whether or not such damages are based on tort including negligence warranty breach of contract or any other legal theory Notwithstanding any damages that customer might incur for any reason whatsoever NXP Semiconductors aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in life support life critical or safety critical syste
13. stack of a car and thus needs to be viewable under a wide angle VA displays are in growing demand for many applications such as automotive white goods home and medical equipment However the VA display technologies have stronger requirements for the display drivers than the TN displays mainly in terms of higher LCD supply voltage Vicp and or higher frame frequency ff The requirements depend on the specific VA technology developed by each LCD manufacturer as well as on the multiplex rates backplane drive configuration used in application See Figure 3 All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 4 of 12 NXP Semiconductors UM10764 UM10764 Vertical Alignment VA displays and NXP LCD drivers Frame Frequency Fig 3 Hz 400 1 X multiplex rate 300 200 100 5 10 15 20 25 30 V Vico Note that the VA displays in mass production are only available with multiplex rates up to 1 64 The major LCD manufacturing companies are working to develop the VA technology for higher multiplex rates VA display requirements All information provided in this document is subject to legal disclaimers NXP B V 2013 All rights reserved User manual Rev 1 11 November 2013 5 of 12 NXP Semiconductors U M1 0764 Vertical Alignment VA displays and NXP LCD drivers
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