Liquid crystal display of field sequential color type and method for driving the same
Disclosed are a liquid crystal display, which can increase a design margin upon designing a driving timing chart, improve picture quality characteristics and reduce power consumption, and a method for driving the same. The liquid crystal display of a field sequential color type comprises an LCD panel having a plurality of pixels arranged in a matrix form defined by gate lines and data lines crossing each other, a sub-field time setting unit for selecting 1 horizontal period according to an externally input frame frequency and a first user-set signal and determining a wait period and a flash period corresponding to the 1 horizontal period according to second and third user-set signals, a timing controller for producing and outputting a gate control signal and a data control signal corresponding to the 1 horizontal period and the wait period and a light source control signal corresponding to the wait period and a re-aligned pixel data, a gate driver for sequentially outputting a scan pulse to the gate lines according to the gate control signal, a data driver for outputting a data voltage to the data lines every 1 horizontal period according to the data control signal, and a backlight unit for sequentially outputting red, green and blue light to the pixels, respectively, according to the control of the timing controller.
1. A field sequential color type liquid crystal display comprising:
a LCD panel that has a plurality of pixels arranged in a matrix form defined by gate lines and data lines that cross each other;
a memory configured to store a first user-set data which includes a horizontal period, a second user-set data which includes a wait period of liquid crystals and a third user-set data which includes a flash period of driving a backlight unit, the first to third user-set data being variable;
a horizontal period variation unit that receives a frame frequency, selects 1 horizontal period corresponding to the frame frequency according to the first user-set data from the memory;
a wait period variation unit that varies a wait period according to the 1 horizontal period and the second user-set data from the memory;
a flash period variation unit that varies a flash period according to the 1 horizontal period and the third user-set data from the memory;
a timing controller that produces and outputs a gate control signal and a data control signal that corresponds to the 1 horizontal period and the wait period and a light source control signal corresponding to the wait period and a re-aligned pixel data;
a gate driver that sequentially outputs a scan pulse to the gate lines according to the gate control signal; and
a data driver that outputs a data voltage to the data lines every 1 horizontal period according to the data control signal,
wherein the backlight unit that sequentially outputs red, green and blue light to the pixels according to the light source control signal,
wherein one frame comprises three sub-frames of red, green and blue, and each of the sub-frames is composed of three sub-fields that consists of a variable addressing period that corresponds to the 1 horizontal period, the wait period and the flash period.
2. The liquid crystal display of claim 1 , wherein the wait period and the flash period can be set according to an ambient temperature or a luminance deviation.
3. The liquid crystal display of claim 1 , wherein each of the variable three sub-fields consists of a minimum setup time and a variable time.
4. A field sequential color type liquid crystal display comprising:
a LCD panel that has a plurality of pixels arranged in a matrix form defined by gate lines and data lines that cross each other;
a memory configured to store a first user-set data which includes a horizontal period, a second user-set data which includes a wait period of liquid crystals and a third user-set data which includes a flash period of driving a backlight unit, the first to third user-set data being variable;
a frequency modulation unit that modulates an externally input frame frequency that corresponds to one frame;
a horizontal period variation unit that receives a frame frequency, selects 1 horizontal period corresponding to the frame frequency according to the first user-set data from the memory;
a wait period variation unit that varies the wait period according to the 1 horizontal period and the second user-set data from the memory;
a flash period variation unit that varies the flash period according to the 1 horizontal period and the third user-set data from the memory;
a timing controller that produces and outputs a gate control signal and a data control signal that corresponds to the 1 horizontal period and the wait period and a light source control signal that corresponds to the wait period and a re-aligned pixel data;
a gate driver that sequentially outputs a scan pulse to the gate lines according to the gate control signal; and
a data driver that outputs a data voltage to the data lines every 1 horizontal period according to the data control signal,
wherein the backlight unit that sequentially outputs red, green and blue light to the pixels according to the light source control signal,
wherein one frame comprises three sub-frames of red, green and blue, and each of the sub-frames is composed of three sub-fields each consisting of a variable addressing period that corresponds to the 1 horizontal period, the wait period and the flash period.
5. The liquid crystal display of claim 4 , wherein the wait period and the flash period can be set, according to an ambient temperature or a luminance deviation.
6. A method for driving a liquid crystal display of a field sequential color type, comprising:
storing a first user-set data which includes a horizontal period, a second user-set data which includes a wait period of liquid crystals and a third user-set data which includes a flash period of driving a backlight unit on a memory, the first to third user-set data being variable;
selecting 1 horizontal period for driving gate lines of an LCD panel according to the first user-set data from the memory if a frame frequency that corresponds to one frame is externally input;
varying a wait period according to the 1 horizontal period and the second user-set data;
varying a flash period according to the 1 horizontal period and the third user-set data
producing and outputting a gate control signal and a data control signal that corresponds to the 1 horizontal period and the wait period and a light source control signal corresponding to the wait period and a re-aligned pixel data;
sequentially outputting a scan pulse to the gate lines according to the gate control signal;
converting the pixel data into a data voltage and outputting the data voltage to the data lines every 1 horizontal period according to the data control signal; and
sequentially outputting red, green and blue light according to the light source control signal,
wherein the one frame comprises three sub-frames of red, green and blue, and each of the sub-frames is composed of three sub-fields that consist of a variable addressing period that corresponds to the 1 horizontal period, the wait period and the flash period.
7. The method of claim 6 , wherein the step of selecting 1 horizontal period that drives gate lines of an LCD panel comprises:
modulating the externally input frame frequency; and
selecting 1 horizontal period that drives the gate lines of the LCD panel according to the modulated frame frequency and the first user-set data.
8. The method of claim 6 , wherein the the wait period and flash period is set according to an ambient temperature or a luminance deviation.