Gamma correction circuit of a liquid crystal display using a memory device

Claim 3

The apparatus according to claim 1, wherein said memory device comprises one of a read only memory and a random access memory.

Claim 4

The apparatus according to claim 2, wherein said input value comprises a voltage level.

Claim 5

The apparatus according to claim 3, wherein said memory device comprises one of a read only memory and a random access memory.

Claim 6

The apparatus according to claim 3, wherein said programmed data may be changed according to the characteristics of said at least one liquid crystal.

Claim 7

The apparatus according to claim 3, further comprising a buffer for temporarily storing at least one of said applied input value and said output value.

Claim 8

The apparatus according to claim 3, further comprising a digital-to-analog converter.

Claim 9

The apparatus according to claim 1, wherein said programmed data comprises a plurality of output values having respective storage addresses.

Claim 10

The apparatus according to claim 8, wherein said gamma correction circuit further comprises means for receiving applied input values and means for specifying, for each of said applied input values, one of said storage addresses.

Claim 11

The apparatus according to claim 1, further comprising means for applying a voltage to said at least one liquid crystal in accordance with said output value.

Claim 12

The apparatus according to claim 10, further comprising means for periodically reversing a polarity of said voltage applied to said at least one liquid crystal.

Claim 13

A display apparatus which compensates for non-linear characteristics of gamma, gamma being defined as a ratio of light transmissivity to an input value, comprising: a liquid crystal display having a plurality of liquid crystals; and a gamma correction circuit that makes gamma substantially constant and makes light transmissivity of said plurality of liquid crystals vary substantially linearly with different input values, said gamma correction circuit receiving applied input values for causing said liquid crystals to respond with desired light transmissivities, said gamma correction circuit further including a memory device for storing data programmed to produce output values, in response to said applied input values only, for driving said liquid crystals in place of said applied input values so that said liquid crystals respond with said desired light transmissivities rather than actual light transmissivities of said plurality of liquid crystals corresponding to said applied input values.

Claim 14

A display apparatus which compensates for non-linear characteristics of gamma, gamma being defined as a ratio of light transmissivity to an input value, comprising: a liquid crystal display having a plurality of liquid crystals; and a gamma correction circuit that makes gamma substantially constant and makes light transmissivity of said plurality of liquid crystals vary substantially linearly with different input values, said gamma correction circuit receiving applied input values for causing said liquid crystals to respond with desired light transmissivities, said gamma correction circuit further including a memory device for storing data programmed to produce output values, in response to said applied input values only, for driving said liquid crystals in place of said applied input values so that said liquid crystals respond with said desired light transmissivities rather than actual light transmissivities of said plurality of liquid crystals corresponding to said applied input values.

Claim 15

The apparatus according to claim 12, wherein said memory device comprises one of a read only memory and a random access memory.

Claim 16

The apparatus according to claim 13, wherein said programmed data may be changed according to the characteristics of said plurality of liquid crystals.

Claim 17

The apparatus according to claim 13, further comprising a buffer for temporarily storing at least one of said applied input values and said output values.

Claim 18

The apparatus according to claim 15, further comprising a digital-to-analog converter.

Claim 19

The apparatus according to claim 12, wherein said programmed data comprises a plurality of output values having respective storage addresses.

Claim 20

The apparatus according to claim 17, wherein said gamma correction circuit further comprises means for receiving said applied input values and means for specifying, for each of said applied input values, one of said storage addresses.

Claim 21

The apparatus according to claim 12, further comprising means for applying a voltage to said liquid crystals in accordance with each said output value.

Claim 22

The apparatus according to claim 19, further comprising means for periodically reversing a polarity of said voltage applied to said liquid crystals.

Claim 23

A gamma correction circuit for a liquid crystal display having at least a first liquid crystal and a second liquid crystal, said gamma correction circuit comprising: means for receiving input data including first and second input values for respectively causing said first and second liquid crystals to exhibit desired light transmissivities; a memory device that stores a first set of programmed data corresponding to said first liquid crystal, and a second set of programmed data corresponding to said second liquid crystal, said memory device being responsive to said first and second input values from said receiving means to provide first and second output values from said first and second sets of programmed data, respectively, said first and second output values correcting said first and second input values for non-linear characteristics of said first and second liquid crystals, respectively, so that said first and second liquid crystals exhibit said desired light transmissivities rather than actual light transmissivities different than said desired light transmissivities, caused by said non-linear characteristics, if said first and second input values were directly used to drive said first and second liquid crystals; and means for driving said first and second liquid crystals with said first and second output values, respectively.

Claim 24

A gamma correction circuit for a liquid crystal display having at least a first liquid crystal and a second liquid crystal, said gamma correction circuit comprising: means for receiving input data including first and second input values for respectively causing said first and second liquid crystals to exhibit desired light transmissivities; a memory device that stores a first set of programmed data corresponding to said first liquid crystal, and a second set of programmed data corresponding to said second liquid crystal, said memory device being responsive to said first and second input values from said receiving means to provide first and second output values from said first and second sets of programmed data, respectively, said first and second output values correcting said first and second input values for non-linear characteristics of said first and second liquid crystals, respectively, so that said first and second liquid crystals exhibit said desired light transmissivities rather than actual light transmissivities different than said desired light transmissivities, caused by said non-linear characteristics, if said first and second input values were directly used to drive said first and second liquid crystals; and means for driving said first and second liquid crystals with said first and second output values, respectively.