Gamma correction circuit, method for gamma correction, and display device including gamma correction circuit
A gamma correction circuit includes an input circuit configured to sequentially receive gamma control signals used for selecting gamma tap points from a control circuit through a single transmission line, and to output the received gamma control signals, and a voltage generator configured to select the gamma tap points based on the gamma control signals, and to generate gamma voltages according to the gamma tap points.
1. A gamma correction circuit, comprising:
an input circuit configured to sequentially receive gamma control signals used for selecting gamma tap points from a control circuit through a designated single transmission line for each type of color data, and to output the received gamma control signals, the input circuit comprising:
a voltage level shifter configured to convert voltage levels of the gamma control signals transmitted through the designated single transmission line for each type of color data, and
a switch circuit configured to sequentially output the gamma control signals from the voltage level shifter into latches through multiple transmission lines; and
a voltage generator configured to select the gamma tap points based on the gamma control signals, and to generate gamma voltages according to the gamma tap points.
2. The gamma correction circuit of claim 1 , wherein the latches are configured to respectively latch the gamma control signals, and to concurrently output the latched gamma control signals into the voltage generator.
3. The gamma correction circuit of claim 2 , wherein the switch circuit comprises switches, and
wherein the switches are turned on in response to receiving switching signals, so that the gamma control signals received in the voltage level shifter are output, respectively, by the latches.
4. The gamma correction circuit of claim 3 , wherein the input circuit further comprises a switching signal generator configured to generate the switching signals for turning on the switches, and to sequentially transmit the switching signals into the respective switches.
5. The gamma correction circuit of claim 4 , wherein the switching signal generator comprises output circuits configured to sequentially output the switching signals, and
wherein at least one of the output circuits is used by a level shifter.
6. The gamma correction circuit of claim 2 , wherein the latches are configured to respectively output the latched gamma control signals, in a parallel manner, to the voltage generator in response to receiving a latch control signal.
7. The gamma correction circuit of claim 1 , wherein the voltage generator is configured to select the gamma tap points that become references of the gamma correction based on the gamma control signals, to determine reference gamma voltages for the respective gamma tap points, and to generate the gamma voltages by using the reference gamma voltages.
8. The gamma correction circuit of claim 7 , wherein the voltage generator comprises a resistor string comprising nodes corresponding to the respective gamma tap points, and is configured to generate the gamma voltages by using voltages output from the respective nodes for the respective reference gamma voltages.
9. The gamma correction circuit of claim 8 , wherein the voltage generator is configured to determine positions of the respective nodes in the resistor string by using the received gamma control signals, and to generate the gamma voltages by using reference gamma voltages output from the respective determined nodes.
10. A gamma correction circuit, comprising:
an input circuit configured to sequentially receive M gamma control signals used for selecting M gamma tap points from a control circuit through a single transmission line, M being a natural number equal to or greater than 2, and to respectively output the M gamma control signals through M transmission lines, the input circuit comprising:
a voltage level shifter configured to convert voltage levels of the M gamma control signals transmitted through the single transmission line, and
a switch circuit configured to sequentially output the M gamma control signals from the voltage level shifter into M latches through the M transmission lines; and
a voltage generator configured to generate gamma voltages on the basis of the M gamma control signals.
11. The gamma correction circuit of claim 10 , wherein the M latches are configured to respectively latch the M gamma control signals, and to concurrently output the latched M gamma control signals into the voltage generator.
12. The gamma correction circuit of claim 11 , wherein the switch circuit comprises M switches respectively connected to the M latches, and
wherein the respective M switches are configured to be turned on in response to switching signals so that the M gamma control signals received in the voltage level shifter are output into the respective M latches.
13. The gamma correction circuit of claim 11 , wherein the M latches are configured to respectively output the M latched gamma control signals in a parallel manner into the voltage generator, in response to receiving a latch control signal.
14. The gamma correction circuit of claim 10 , wherein the voltage generator is configured to select the M gamma tap points that become references of the gamma correction based on the M gamma control signals, to determine M reference gamma voltages for the M gamma tap points, and to generate the gamma voltages by using the M reference gamma voltages.
15. A gamma correction method, the method comprising:
sequentially receiving, by an input circuit, gamma control signals used for selecting gamma tap points through a designated single transmission line for each type of color data;
concurrently outputting, by the input circuit in a parallel manner, the sequentially received gamma control signals through multiple transmission lines differing from each other; and
generating gamma voltages on the basis of the outputted gamma control signals,
wherein the input circuit comprises:
a voltage level shifter configured to convert voltage levels of the gamma control signals transmitted through the designated single transmission line for each type of color data, and
a switch circuit configured to sequentially output the gamma control signals from the voltage level shifter into latches through the multiple transmission lines.
16. The method of claim 15 , wherein the outputting in a parallel manner of the sequentially received gamma control signals comprises:
respectively latching the sequentially received gamma control signals; and
concurrently outputting, in a parallel manner, the latched gamma control signals.
17. The method of claim 15 , wherein receiving timings of the respective gamma control signals are different from each other, and output timings of the respective gamma control signals are identical to each other.