CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefits of Taiwan application serial no. 109128810, filed on Aug. 24, 2020, and Taiwan application serial no. 109145728, filed on Dec. 23, 2020. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to a light-emitting diode display device and a light-emission control method thereof, and particularly to a light-emitting diode display device applicable to the variation of frame rate and a light-emission control method thereof.

Description of Related Art

In the conventional display device, when some applications (such as gaming programs) are executed, since the number of game frames that are output based on the display card is not in sync with the scanning rate of the display device, the user may see broken or torn images. To solve this issue, vertical synchronization is introduced to the conventional display device. However, after the function of vertical synchronization is turned on, since the display device still maintains a fixed rate of operation, the problem of delayed display images is still likely to occur. To fix this problem, some display card manufacturers have brought forth a variety of synchronization technologies to make the game images look smooth and seamless. Nevertheless, regardless of the synchronization technologies, the synchronization still relies on reducing the frame rate of the display device. And such method still has the issue(s) of uneven display brightness and/or image flicker when a pulse-driven light-emitting diode display device varies its refresh rate.

SUMMARY

The disclosure provides a light-emitting diode display device and a light-emission control method thereof, which are adapted to maintain the display quality when the frame rate is dynamically varied.

The disclosure also provides a light-emitting diode display device capable of reducing image flicker while maintaining luminous efficacy.

The light-emitting diode display device of the present disclosure includes a timing controller, multiple display pixels, and a scanning circuit. Multiple display rows are formed. The scanning circuit generates multiple scan signals and multiple light-emission signals that respectively drive the display rows. During a first data-writing time period of a first frame period, the timing controller provides multiple write-in data to be respectively written into the display rows. During a light-emitting time period, the scanning circuit drives each light-emission signal to generate multiple pulses periodically based on a set period to drive the corresponding display row to emit light according to each corresponding write-in data. The light-emitting time period is provided after the first data-writing time period and before the end of a second data-writing time period of a second frame period.

The light-emission control method of the present disclosure is adapted for a light-emitting diode display device. The light-emission control method includes: generating multiple scan signals and multiple light-emission signals to respectively drive multiple display rows formed by multiple display pixels; providing multiple write-in data into the display rows during a first data-writing time period of a first frame period to be written into the display rows; and, during a light-emitting time period which is after the first data-writing time period and before the end of a second data-writing time period of a second frame period, driving each light-emission signal to generate multiple pulses periodically based on a set period to drive each of the corresponding display row to emit light according to each corresponding write-in data.

Another light-emitting diode display device of the present disclosure includes multiple display pixels and a driving circuit. The Nth display pixel performs data-writing operation according to the corresponding first gate drive signal, and lights up the corresponding light-emitting diode according to the Nth ramp control signal and the Nth light-emission signal. The first gate drive signal has a first operating rate, and the Nth ramp control signal and the Nth light-emission signal have a second operating rate, where the first operating rate is lower than the second operating rate, and N is a positive integer.

Based on the above, the present disclosure configures each light-emission signal to generate periodically multiple pulses based on a set period during a light-emitting time period amid two adjacent frame periods, thereby driving each corresponding display row to emit light according to the corresponding write-in data. This way, when the frame rate is varied dynamically, the display image does not flicker nor be torn due to the varied frame rate, and improves the display quality effectively. In addition, in the embodiments of the disclosure, the operating rate of the ramp control signal and the light-emission signal is higher than the operating rate of the first gate drive signal on which the data writing operation is based, so as to reduce the occurrence of flicker of the displayed images.

