Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
AN2687 Datasheet(PDF) 9 Page - STMicroelectronics |
|
AN2687 Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 22 page AN2687 LCD drive signals Doc ID 14296 Rev 1 9/22 2.1.2 Contrast calculation The performance of an LCD driving system is defined by the contrast. Contrast (D) = Vrms(On) / Vrms(Off) For the quadruplex signal as described on the previous page: Vrms(On) = = Vrms(On) = Vrms (Off) = Contrast (D) = Vrms(On) / Vrms(Off) = 0.661VDD / 0.433VDD = 1.53 For comparison, a hardware LCD drive uses 1/3 bias voltage. With 1/3 bias control, the contrast value (D) is 1.73. Therefore, 1/3 bias gives only a small contrast advantage. This advantage is reduced to zero when using software contrast control. 1 T --- ft 2dt 0 T 1 T --- V DD 2dt V DD 2 dt V DD 2 ---------- 2 dt 2T 8 ------- T + T 8 --- 2T 8 ------- + 0 T 8 --- 1 T --- V DD 2 T 8 --- V DD 2 T 8 --- V DD 2 4 ------------------ 6T 8 ------------ + + 0.661V DD = 1 T --- 0 dt 0 dt V DD 2 ---------- 2 dt 2T 8 ------- T + T 8 --- 2T 8 ------- + 0 T 8 --- 0.433V DD = |
Número de pieza similar - AN2687 |
|
Descripción similar - AN2687 |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |