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AN2687 Datasheet(PDF) 18 Page - STMicroelectronics |
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AN2687 Datasheet(HTML) 18 Page - STMicroelectronics |
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18 / 22 page  Software contrast control with the first method AN2687 18/22 Doc ID 14296 Rev 1 Since Vx = 0 (in case of a decrease in Vrms) Vrms(on) = = Vrms(off) = Vrms(off) = Since Vx = 0 (in case of a decrease in Vrms) Vrms(off) = Contrast (Dx) = , where Dx is the contrast calculated with the contrast control method Contrast D, between VON and VOFF is constant (quality of contrast). The optical contrast has been changed only by tuning VON close to the threshold value of the LCD. 1 1x + ------------ 14V DD 32 ------------------ 2 1 1x + ------------ 0.661V DD 1 TxT + ----------------- 0 dt 0 dt V DD 2 ----------- 2 dt Vx 2 dt 8 0 xT 8 ------- + 2T 8 ------- T + T 8 --- 2T 8 ------- + 0 T 8 --- 1 TxT + ----------------- 6V DD 32 --------------- 2 dt Vx 2 x + 1 1x + ------------ 0.433V DD 1 1x + ------------ 0.661V DD 1 1x + ------------ 0.433V DD ----------------------------------------------------- |
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