Display device
View Patent ↗The response of the last addressed lines in a pulsed backlight LCD is enhanced by introducing overdrive at these last lines, for instance, via capacitive coupling or by means of a temperature gradient.
1. A display device comprising:
a pixel and at least one switching element at each area of intersection of a matrix of selection electrodes and data electrodes, and
a first driver that is configured to drive the selection electrodes in a sequence and
a second driver that is configured to drive the data electrodes, and
a pulsed backlight system that applies a pulse of light at a select time after the sequence of selecting the pixels;
wherein
the display device is configured to increase a switching rate of pixels based on the sequence, so as to minimize a variance between the select time of applying the pulse of light and times that the pixels complete their switching.
2. The display device of claim 1 , wherein
the display device is configured to increase the switching rate of the pixels by increasing an applied drive voltage across the pixels based on the sequence of selecting the pixels.
3. The display device of claim 1 , wherein
a picture electrode of a pixel is capacitively coupled to a further electrode, and
the display device is configured to increase the switching rate of the pixels by increasing an applied drive voltage across the pixels via the capacitive coupling.
4. The display device of claim 3 , wherein
the drive voltage is applied across the pixels via a capacitive coupling with a juxtaposed selection electrode.
5. The display device of claim 3 , wherein
the capacitive coupling between the picture electrode and the further electrode is dependent upon the sequence of selecting the pixels.
6. The display device of claim 1 , wherein
the display device is configured to increase the switching rate of the pixels by generating a temperature gradient during operation, at which the temperature increases in a direction of the sequence of selecting the pixels.
7. A display device comprising:
an array of pixels ttiat includes rows of pixels that are selected by a plurality of row drive signals,
a row driver that is configured to sequentially apply each row drive signal of the plurality of row drive signals from a first time to a second time within a frame period, each row of pixels thereby having a sequentially increasing row selection time, and
a lighting source that is configured to provide a pulse of light at a third time within the frame period,
wherein
the display device is configured such that a switching rate of each row of pixels is configured to be based on a difference between the third time and the row selection time of the row of pixels.
8. The display device of claim 7 , wherein
the row driver is configured to apply sequentially larger voltage differentials to form each row drive signal from the first time to the second time within the frame period.
9. The display device of claim 8 , wherein
each pixel of each row of pixels includes a capacitance that effects the switching rate of the row of pixel, and
the capacitance of the pixels of each row of pixels is based on the difference between the third time and the row selection time of the row of pixels.
10. The display device of claim 9 , wherein
each capacitance is formed by an overlap of a picture electrode of the pixel and a row electrode that provides the row drive signal to a prior row of pixels, and
an amount of the overlap is based on the difference between the third time and the row selection time of the row of pixels.
11. The display device of claim 10 , wherein
the display device is configured such that an operating temperature of each row of pixels is dependent upon the difference between the third time and the row selection time of the row of pixels.
12. The display device of claim 9 , wherein
the display device is configured such that an operating temperature of each row of pixels is dependent upon the difference between the third time and the row selection time of the row of pixels.
13. The display device of claim 8 , wherein
the display device is configured such that an operating temperature of each row of pixels is dependent upon the difference between the third time and the row selection time of the row of pixels.
14. The display device of claim 7 , wherein
each pixel of each row of pixels includes a capacitance that affects the switching rate of the row of pixel, and
the capacitance of the pixels of each row of pixels is based on the difference between the third time and the row selection time of the row of pixels.
15. The display device of claim 14 , wherein
each capacitance is formed by an overlap of a picture electrode of the pixel and a row electrode that provides the row drive signal to a prior row of pixels, and
an amount of the overlap is based on the difference between the third time and the row selection time of the row of pixels.
16. The display device of claim 15 , wherein the display device is configured such that an operating temperature of each row of pixels is dependent upon the difference between the third time and the row selection time of the row of pixels.
17. The display device of claim 14 , wherein
the display device is configured such that an operating temperature of each row of pixels is dependent upon the difference between the third time and the row selection time of the row of pixels.
18. The display device of claim 7 , wherein the display device is configured such that an operating temperature of each row of pixels is dependent upon the difference between the third time and the row selection time of the row of pixels.
19. The display device of claim 18 , wherein the operating temperature of each row of pixels increases as the difference between the third time and the selection time of the row of pixels decreases.
20. The display device of claim 7 , wherein the switching rate of each row of pixels increases as the difference between the third time and the selection time of the row of pixels decreases.