A display device includes: a substrate including a first pixel region, at least one second pixel region having a smaller area than the first pixel region, the at least one second pixel region being disposed adjacent to the first pixel region, and a peripheral region surrounding the first pixel region and the second pixel region; first and second pixels respectively provided in the first and second pixel regions; first and second lines respectively connected to the first and second pixels; a dummy line connected to one of the first and second lines to extend to the peripheral region; and a first dummy part including a dummy pixel connected to the dummy line in the peripheral region.

In a display device, a drive circuit drives LEDs arranged in n rows (n is an integer equal to or greater than two) so as to correspond to a plurality of areas of a backlight, row by row through division into n time slots or every k rows (k is an n's divisor equal to or greater than two and is smaller than n) through division into n/k time slots in accordance with the status of use of the display device.

A test apparatus includes: an electrical connection unit configured to be electrically connected to a light emitting device panel having a plurality of cells each including a light emitting device and arranged in a row direction and a column direction; a light source unit configured to collectively irradiate the plurality of cells with light; a reading unit configured to read, for each row of the light emitting device panel, a photoelectric signal obtained by photoelectrically converting the light in each of two or more of the cells arranged in the column direction by the light emitting device; a measuring unit configured to measure a photoelectric signal read from each of the plurality of cells; and a determination unit configured to determine a quality of each of the plurality of cells on a basis of a measurement result of the measuring unit.

In an embodiment a passive matrix LED display module includes n>1 first electrical lines connected to a respective first switch, m>1 second electrical lines connected to a respective second switch and at least m.Math.n LED light sources, wherein each of the LED light sources is connected on an anode side to a first line and on a cathode side to a second line, wherein each of the first switches is a push-pull switch having a first terminal for connection to an LED supply voltage, a second terminal for connection to an adjustable discharge potential, a third terminal for receiving a switching signal and a fourth terminal for connection to an associated first line, wherein each of the second switches in a switched state is configured to allow current to flow to a reference potential, and wherein the second terminals of the push-pull switches are connected in common to an output voltage terminal of an adjustable voltage source.

A display apparatus and a method of controlling thereof are provided. The display apparatus may include a display including a plurality of light emitting diode (LED) devices, a driver configured to drive the plurality of LED devices, and a controller configured to control the driver to apply an image signal to each of a plurality of scan lines, and apply a first image signal to a first image frame period in a first scan line among the plurality of scan lines and apply the first image signal to a second image frame period in a second scan line among the plurality of scan lines.

The present invention provides a source driver for driving a light emitting diode panel. The source driver includes a buffer including an output terminal; and a plurality of driving circuits coupled to the buffer. Each of the plurality of driving circuits includes a constant current transistor including a gate controlled by a node voltage of the output terminal of the buffer; and a compensation unit for compensating the node voltage of the output terminal of the buffer.

There are provided display controllers and driving methods related to those described in US Published Patent Application No. 2013/0194250. These include (a) a display controller having an update buffer, means for removing from the update buffer pixels not requiring updating, and means to ensure that pixels having certain special states are not removed from the update buffer; (b) a method of driving a bistable display wherein, in a pixel undergoing a white-to-white transition and lying adjacent another pixel undergoing a visible transition, there is applied to the pixel one or more balanced pulse pairs and at least one top-off pulse; (c) a method of driving a bistable display by overlaying a non-rectangular item over a pre-existing image content and then removing the item, where only pixels in the region of the item perform transitions (including self-transitions); and (d) a method of driving a bistable display in which a proportion of background pixels not undergoing an optical change are subjected to a refresh pulse to correct optical state drift.

The present invention provides a method of controlling a display panel. The display panel includes a plurality of subpixels and a plurality of scan lines coupled to the plurality of subpixels. The method includes steps of: scanning a first scan line among the plurality of scan lines to turn on at least one of the plurality of subpixels coupled to the first scan line during a subframe period among a display frame period; and discharging a second scan line among the plurality of scan lines during a non-display period following the subframe period. Wherein, the second scan line is different from the first scan line.

The present invention provides a drive-control method and control apparatus of display screens, and a display screen thereof, the method includes: determining a staged target gray-scale value of all sub-pixels in the currently scanned row, based on a current gray-scale value of each sub-pixel, the staged target gray-scale value and a pre-stored look-up table, determining the charging-discharging target count corresponding to each column channel in the current scan row, terminating the charging-discharging of the column channel, when the count of the counter is consistent with the target count corresponding to the charging or discharging of each column channel. The present invention in implementation not only has simple structure and a small scale circuit, but also low power consumption.

A display driver has current reference units and current-generating units. Each current reference unit generates a reference current and scaling it to form a scaled reference current. Each current-generating unit generates an output current from one scaled reference current to drive a selected light emitter (LE) of a LE matrix over a time slice allocated for driving the selected LE. Each current-generating unit has a switching circuit modulating the scaled reference current according to a switching sequence to form output current pulses to drive a LE. The processor determines the switching sequence to avoid a shortest current pulse shorter than a minimum current pulse width via (a) calculating a duty cycle as a ratio of an average output current to the scaled reference current, (b) mapping the duty cycle to a modulation sequence, and (c) repeating stretching a time duration of the modulation sequence by double, splitting the modulation sequence into half, and allocating the split sequence into two times of original time slice, until the shortest current pulse satisfies the above-mentioned requirement.