TA1204AF Datasheet, PDF (14/25 Pages) Toshiba Semiconductor – γ CORRECTION IC FOR LCD TV

TA1204AF
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Maximum amount of contrast adjustment, inter-axis deviation
• Test condition 4 (CP mode)
• Input : X In1
Test signal 3
• VR33 : Max (pin 33←5V)
Change SW33 from a to b, and adjust VR33 until 5V is applied to pin 33. Input a signal (0.7Vp-p)
including black and white levels at input A. Measure the amplitudes between the black and white
waveform levels at output terminals (pin 21 when X = B, pin 19 when X = G, and pin 14 when X = R).
Calculate their ratio with the typical signal output amplitude and express it in dB units. Repeat this
measurement replacing B, G, and R as the X-axis.
Typical amount of brightness adjustment, inter-axis deviation
• Test condition 4 (CP mode)
• Input : X In1
Test signal 3
Input a signal (0.7Vp-p) including black and white levels to input A.
Measure the voltage difference between the black and γ0 waveform levels for an output pin (pin 21
when X = G, pin 19 when X = G, and pin 14 when X = R) for positive and negative polarities.
Repeat this measurement replacing B, G, and R as the X-axis.
Maximum amount of brightness adjustment, inter-axis difference
• Test condition 4 (CP mode)
• Input : X In1
Test No. 3
• VR27 : Max (pin 27←0V)
Change SW27 from OFF to ON, and adjust VR27 until 0V is applied to pin 27.
Input a signal (0.7Vp-p) including black and white levels in input A (X In1).
Measure the voltage difference between the black and γ0 waveform levels for an output pin (pin 21
when X = B, pin 19 when X = G, and pin 14 when X = R).
Repeat this measurement replacing B, G, and R as the X-axis.
Minimum amount of brightness adjustment
• Test condition 4 (CP mode)
• Input : X In1
Test signal 3
Change SW27 from OFF to ON, and adjust VR27 until 5V is applied to pin 27. Input a signal
(0.7Vp-p) including black and white levels to input A (X In1).
Measure the voltage difference between black and γ0 waveform levels for an output pin (pin 21 when
X = B, pin 19 when X = G, and pin 14 when X = R).
Repeat this measurement replacing B, G, and R as the X-axis.
Typical cut-off level, inter-axis deviation
• Test condition 4 (CP mode)
• Input : X In1
Test signal 3
Input a signal (0.7Vp-p) including black and white levels to input A (X In1).
Measure the voltage difference between the γ0 levels of the positive and negative polarity outputs in
an output pin (pin 21 when X = B, pin 19 when X = G, and pin 14 when X = R).
Repeat this measurement replacing B, G, and R as the X-axis.
Maximum range of cut-off adjustment, inter-axis deviation
• Test condition 4 (CP mode)
• Input : X In1
Test signal 3
• VR25 : Max (pin 25←0V)
Change SW25 from OFF to ON, and adjust VR25 fully until 0V is applied to pin 25.
Input a signal (0.7Vp-p) including black and white levels to input A (X In1).
Measure the voltage difference between the γ0 level of the positive output and that of the negative
output in an output pin (pin 21 when X = B, pin 19 when X = G, and pin 14 when X = R).
Repeat this measurement replacing B, G, and R as the X-axis.
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