when the value of led backlight image is smallest because the curve is lcd to lcd and the upper limit of lcd compensation soft clipping of compensated lcd is easy to implement based on lcd to lcd compensation curve the gain value of lcd compensation can be calculated by shown in fig4 on the right for hardware implementation the lcd compensation gain value can be stored into one or more luts in fig4 the straight line is the lcd image data values in this figures the x axis is the original pixel value lcd the y axis is the adjusted value lcd u2032 each curve in the fig4 7 are for a given led u2032 value the curve in fig3 represents the max lcd compensation gain for a given led u2032 value x axis the values in fig3 correspond to the line 42 in fig5 7 the dash lined 40 in fig4 7 are represented by equivalent gains in the corresponding figure on the left hand side note that in fig4 7 when the lcd values are very small the gain is also smaller than expected this increases the apparent dynamic range of the input signal by making blacks look blacker seen from fig4 the max compensation gain is between 3 and 3 5 when the lcd image data value is very small the compensation gain of lcd is very low and less than max compensation gain the operation.