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AN1048 데이터시트(PDF) 17 Page - STMicroelectronics |
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AN1048 데이터시트(HTML) 17 Page - STMicroelectronics |
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17 / 21 page ![]() AN1048 Software contrast control 17/21 Since Vx = 0 (incase of a decrease in Vrms) Since Vx = 0 (incase of a decrease in Vrms) Where Dx = Contrast calculation with contrast control method Vrms ON () 1 1x + ------------ 14Vcc 2 () 32 -------------------------- Vx () 2 x ⋅ + ⎝⎠ ⎜⎟ ⎛⎞ = Vrms ON () 1 1x + ------------ 14Vcc 2 () 32 -------------------------- = Vrms ON () 1 1x + ------------0.661Vcc = Vrms OFF () 1 TxT + ----------------- 0 () t0 () tVcc () 2 ⁄ () 2 tVx 2 () t8 ⋅ d 0 xT 8 ------- ∫ + d 2T 8 ------- T ∫ + d T 8 --- 2T 8 ------- ∫ + d 0 T 8 --- ∫ ⎝⎠ ⎜⎟ ⎜⎟ ⎛⎞ = Vrms OFF () 1 1x + ------------ 6Vcc 2 () 32 ---------------------- Vx 2 x ⋅ + ⎝⎠ ⎜⎟ ⎛⎞ = Vrms OFF () 1 1x + ------------0.18Vcc = Contrast Dx () 1 1x + ------------0.661Vcc ⎝⎠ ⎛⎞ 1 1x + ------------0.18Vcc ⎝⎠ ⎛⎞ ------------------------------------------------- = |
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