Embodiments of the present disclosure provide a test circuit, a test method, a display panel and a display apparatus. Each of the signal input terminals may input a plurality of signals in a time division multiplexed manner, and in turn may be controlled by the corresponding switches to form a plurality of signal lines, a signal flow of the plurality of signal lines are totally different from each other under control of the switches. For example, one of the signal lines may function as a signal input line, and the other one of the signal lines may function as a signal input line for other specific testing, such as aging process so as to input signals different from the normal turn-on state signals. Consequently, by controlling the corresponding switches through the control signal terminals so that different input signals pass through different signal lines into the display panel to meet testing requirements of normal turn-on state testing, aging process and so on for the display panel. With respect to the prior art, the testing signals may be input without passing through a shift register unit, which avoids damage of a specific testing signal such as aging signal on the shift register unit and ensure a normal displaying function of the display panel.

A display device manufacturing method includes: lighting up a display device for a predetermined period; measuring, as first brightness, brightness of the display device at a start of lighting; measuring, as second brightness, brightness of the display device when the predetermined period has elapsed; calculating a deterioration rate of the second brightness with respect to the first brightness; and discriminating the display device as a defective item if the deterioration rate is greater than a threshold value.

A display panel and a method for fabricating the same are provided. The display panel includes: a TFT array substrate; an OLED array disposed on the TFT array substrate, a package layer which covers the OLED array, an upper protection layer covering the package layer, and a lower protection layer. In a first direction, a first projection of the OLED array on the TFT array substrate is located within a second projection of the package layer on the TFT array substrate, and there is a first distance between a boundary of the first projection and a boundary of the second projection. Also in the first direction, the second projection is located within a third projection of the upper protection layer on the TFT array substrate, and there is a second distance between the boundary of the second projection and a boundary of the third projection.

A method of increasing the lifetime of an ITO-free organic lighting system comprises: providing an organic lighting element having a substrate (12) bearing a set of anode electrode metal tracks (14), a conductive organic layer (16) over said metal tracks, an organic light emitting layer (18) over said conductive organic layer, and a cathode electrode layer (20) over said organic light emitting layer, wherein said metal comprises copper, and wherein said conductive organic layer comprises a doped conducting polymer, and driving the organic lighting element with a pulsed current drive. A biphasic pulse is employed having a first, on-phase with a defined current drive and a second, off-phase with a drive having a defined potential difference of zero volts across the lighting element. The anode electrode metal may have a higher work function than the cathode electrode layer. During said zero level drive portion the different work functions provide a reverse bias electric field within the organic lighting element.

In one aspect, a display panel and a manufacturing method of the same is provided. The display panel includes a non-emission region layer having a plurality of emission regions and a connection region that is open to connect adjacent emission regions; an organic emission layer formed in each of the plurality of emission regions; a counter electrode formed in the emission regions and the connection region; and an encapsulation layer formed on the counter electrode.

The present disclosure relates to a method for manufacturing an EL display apparatus including a light-emitting portion in which a light emitting layer is disposed between a pair of electrodes, a thin film transistor array device for controlling light emission of the light-emitting portion, and an EL display panel in which a plurality of pixels of colors of R, G, and B are disposed. After production of the EL display panel, an inspection step is performed to apply, to each of the pixels, a voltage which is preset for each of the colors of R, G, and B of the pixels, the voltage applied in the inspection step is a potential difference that is a reverse bias voltage opposite to an anode voltage and a cathode voltage during lighting, and the potential difference allows a faulty pixel to turn to a dead dot.

A method of aging a display device includes: inputting a display device including a plurality of pixels into an aging chamber, reaching a preset condition of the display device, sensing each of the plurality of pixels, compensating each of the plurality of pixels, and aging the display device.

A method of predicting a lifespan of a display device includes preparing a test panel including a test light emitting element including a first and second test light emitting layers, measuring a luminance of the first and second color of the test panel to acquire first and second deterioration data of the first and second color, calculating a lifespan of a pixel based on the first and second deterioration data, and a first and second color component ratio of first emission light for a thickness of a wavelength conversion layer. The pixel includes a light emitting element emitting the first emission light and mixed light of the first and second color, and the wavelength conversion layer, and a light emitting layer of the light emitting element includes a first light emitting layer emitting light of the first color, and a second light emitting layer emitting light of the second color.