Image display device
An image display device includes a glass, a plurality of driving circuits disposed on the glass, and a plurality of light emitting elements disposed on the driving circuits respectively. The plurality of light emitting elements corresponds to a plurality of pixels respectively. Each of the plurality of driving circuits is configured to provide a driving current to each of the plurality of light emitting elements and to control the driving current by a pulse amplitude modulation and a pulse width modulation.
1. An image display device comprising:
a glass;
a plurality of driving circuits disposed on the glass; and
a plurality of light emitting elements disposed on the driving circuits respectively and corresponding to a plurality of pixels respectively,
each of the plurality of driving circuits being configured to provide a driving current to each of the plurality of light emitting elements and to control the driving current by a pulse amplitude modulation and a pulse width modulation.
2. The image display device according to claim 1 , wherein each of the driving circuits includes a LTPS-TFT.
3. The image display device according to claim 1 , wherein each of the driving circuits includes an oxide-TFT.
4. The image display device according to claim 1 , wherein the plurality of light emitting elements include inorganic semiconductors respectively.
5. The image display device according to claim 1 , wherein the plurality of light emitting elements include Group III-V compound semiconductors respectively.
6. The image display device according to claim 1 , wherein the plurality of light emitting elements include EL quantum dot elements respectively.
7. The image display device according to claim 1 , further comprising:
a correction circuit configured to correct at least one out of characteristics of the light emitting elements and characteristics of the driving circuits.
8. The image display device according to claim 1 , wherein a plurality of cathode electrodes of the light emitting elements are connected to a ground line.
9. The image display device according to claim 1 , wherein a plurality of anode electrodes of the light emitting elements are connected to a direct current power line.
10. An image display device comprising:
a glass;
a plurality of driving circuits disposed on the glass;
a plurality of light emitting elements disposed on the driving circuits respectively and corresponding to a plurality of pixels respectively; and
each of the plurality of driving circuits being configured to provide a driving current to each of the plurality of light emitting elements and to control the driving current by a pulse amplitude modulation and a pulse width modulation,
wherein each of the driving circuits includes a PWM section that performs the pulse width modulation and a PAM section that performs the pulse amplitude modulation, wherein the PWM section includes an inverter.
11. The image display device according to claim 10 , wherein the inverter includes a switch element that is capable to short-circuit between an input of the inverter and an output of the inverter.
12. The image display device according to claim 10 , wherein the inverter is connected to a reference triangular wave signal line that is input a reference triangular wave signal for the pulse width modulation.
13. The image display device according to claim 12 , wherein the reference triangular wave signal is one of a sawtooth wave or an inverted sawtooth wave.
14. The image display device according to claim 12 , wherein the reference triangular wave signal has γ-characteristic.
15. An image display device comprising:
a glass;
a plurality of driving circuits disposed on the glass;
a plurality of light emitting elements disposed on the driving circuits respectively and corresponding to a plurality of pixels respectively;
each of the plurality of driving circuits being configured to provide a driving current to each of the plurality of light emitting elements and to control the driving current by a pulse amplitude modulation and a pulse width modulation; and
a signal voltage writing circuit to set a first signal voltage value representing a gradation of the pulse width modulation and a second signal voltage value representing a gradation of the pulse amplitude modulation, the first signal voltage value and the second signal voltage value being assigned to each of the driving circuits, wherein
a number of combinations of levels of the first signal voltage value and levels of the second signal voltage value is larger than a number of levels of the gradation of the pulse width modulation and larger than a number of levels of the gradation of the pulse amplitude modulation.