33results about How to "Luminous brightness is stable" patented technology

The invention discloses a backlight constant-current control circuit and a backlight structure. The backlight constant-current control circuit comprises a light-emitting module and a constant-currentcontrol module, wherein the constant-current control module comprises a voltage regulation unit and a feedback unit which are electrically connected; a feedback unit is electrically connected with theoutput end of the light-emitting module and is used for outputting a voltage regulation signal to the voltage regulation unit when the working current of the light-emitting module deviates from a preset current; and the voltage regulation unit is electrically connected with the input end of the light-emitting module and is used for adjusting the voltage of the input end of the light-emitting module according to the voltage regulation signal so as to adjust the working current of the light-emitting module to the preset current, so that the light-emitting brightness of the light-emitting moduleis kept at the preset light-emitting brightness. The current of the light-emitting module is kept at the preset current by performing constant-current control on the light-emitting module, so that uneven brightness caused by current fluctuation is avoided, and the backlight brightness stability is improved.

The invention relates to a pixel circuit, a driving method of the pixel circuit, a display panel and a display device. The pixel circuit comprises a first charging module, a storage capacitor, a second charging module, a resetting module, a drive transistor, an emission control module and a light-emitting device. The first charging module and the second charging module are connected with two ends of the storage capacitor, respectively and are used for charging the two ends of the storage capacitor. The resetting module is connected with the two ends of the storage capacitor and used for resetting voltages of the two ends of the storage capacitor to respective initial voltages; a control electrode of the drive transistor is connected with one end, connected with the second charging module, of the storage capacitor; a first electrode of the drive transistor is connected with a high-tension terminal, and a second electrode of the drive transistor is connected with the second charging module; the emission control module is connected between the drive transistor and the light-emitting device and used for connecting or disconnecting the drive transistor and the light-emitting device. The pixel circuit keeps lighting brightness of the light-emitting device in the displaying process, and displaying effect is thereby improved.

The present invention provides an AMOLED pixel driving circuit and a pixel driving method. By utilizing the dual gate thin film transistor to be the drive thin film transistor, in the pre-charge stage, the preset voltage (Vpre) is written to the bottom gate (BG) of the first thin film transistor (T1), and the power source voltage (VDD) is written to the top gate; in the threshold voltage programming stage, the voltage of the top gate (TG) of the first thin film transistor (T1) drops, and the threshold voltage is raised until the threshold voltage is lifted up to Vth=Vpre−VOLED; in the drive stage, the voltage of the top gate (TG) is kept unchanged to keep the threshold voltage remaining to be Vth=Vpre−VOLED, and the data signal Data drives the first thin film transistor (T1) to be activated to make the organic light emitting diode (D1) emit light.

The present invention provides an AMOLED pixel driving circuit and a pixel driving method which utilize the 6T1C structure driving circuit, wherein the fourth thin film transistor (T4) is located between a gate (G) of the first thin film transistor (T1) and a power source negative voltage (VSS), and controls writing the power source negative voltage (VSS) to the gate (G) of the first thin film transistor (T1) by receiving an electrical property recovery control signal (CS), and the fifth thin film transistor (T5) and the sixth thin film transistor (T6) are electrically coupled to a drain (D) and a source (S) of the first thin film transistor (T1), respectively, and control writing a reference negative voltage (Vref) to the drain (D) and the source (S) of the first thin film transistor (T1) with the electrical property recovery control signal (CS).

The invention discloses an array substrate and a display device, and relates to the technical field of display. In the embodiment of the invention, A current adjusting structure is added. According tothe current light-emitting brightness of the correspondingly connected light-emitting device, The driving current output to the light-emitting device is adjusted, so that the current light-emitting brightness of the light-emitting device is adjusted, the light-emitting brightness of the light-emitting device is kept stable, the ghost shadow problem caused by unstable light-emitting brightness ofthe light-emitting device is avoided, and the display effect is improved.

The invention provides a pixel unit drive circuit and a display device. The pixel unit drive circuit comprises an organic light-emitting diode, a drive transistor, a switch transistor, a storage capacitor and a compensation circuit. The first end of the storage capacitor is connected with the first end of a power supply, and the second end of the storage capacitor is connected with the drain electrode of the switch transistor, the grid electrode of the drive transistor and the compensation circuit. The pixel unit drive circuit further comprises a voltage negative feedback circuit which is respectively connected with the second end of the storage capacitor and the first end of the power supply, and the voltage negative circuit is used for adjusting voltage of the second end of the storage capacitor reversely according to changes of voltage at the second end of the storage capacitor. In the pixel unit drive circuit, data signal voltage stored in the storage capacitor relatively keeps stable, and accordingly the light-emitting brightness of the organic light-emitting diode can keep stable and the display effect is improved.

The invention provides a driving circuit of a light emitting diode (LED) for driving a plurality of LEDs to emit light. The LEDs are connected serially into a plurality of LED series. The driving circuit comprises a power converter, a detection circuit and a return circuit. The power converter provides a driving voltage to the LED series. The detection circuit detects the voltage of each LED series, makes a comparison between the voltage of each LED series and a scheduled reference voltage to find out whether the voltage is different from the reference voltage (that is, the LED series work ina non-scheduled condition), and sends a detection signal to the return circuit. The return circuit receives detection signal and outputs a control signal to the power converter so that the power converter adjusts the driving voltage in respond to the control signal to keep the LED series in a normal operation state.

The invention relates to a luminescent plate. The luminescent plate comprises a luminescent surface layer and a base material layer, the luminescent surface layer and the base material layer are obtained by solidifying corresponding weight parts of raw materials and compounded to prepare the luminescent plate which has moderate strength and toughness, the luminescent plate can be cut into luminescent products of any size and shape, the luminescent brightness of the luminescent plate obtained by compounding the luminescent surface layer and the base material layer is stable, and the luminescentduration is prolonged; the weather resistance, aging resistance and the like of the luminescent plate are further improved, and the situation does not easily occur that since the luminescent plate turns yellow when being used outdoors, the impression is influenced. According to the composition of the raw materials of the luminescent surface layer and the base material layer, a corresponding preparation method is established, all components are even and uniform, the solidified luminescent surface layer and the solidified base material layer are tightly combined, and the performance is stable.

The invention relates to a LED, specifically a LED with long light emitting life, a good light emitting efficiency and stable brightness, comprising: a substrate; a thermal conductive layer arranged on surface of the substrate; a first semiconductor layer arranged on part surface of the thermal conductive layer; an active layer arranged on surface of the first semiconductor layer; a second semiconductor layer arranged on surface of the active layer; a radiation film layer arranged on the surface of the part of the first semiconductor layer which is not covered by and is arranged on the thermal conductive layer; an insulative layer on surface of that part of the thermal conductive layer which is not covered by the first semiconductor layer and the radiation film layer; a first electric contact part connected to the substrate electrically; and a second electric contact part connected to the second semiconductor layer electrically.

The invention discloses a method for stabilizing the working current of a light emitting diode (LED) power-saving lamp, which is characterized in that the end of a luminotron series circuit of the LED power-saving lamp is additionally connected with a three-end voltage stabilizer. Since the output end of the three-end voltage stabilizer is stable, current passing through a load is also stable, and the stability of the working current of an LED series circuit is ensured. Therefore, even though the voltage of alternating current (AC) commercial power fluctuates, the luminance brightness of the LED power-saving lamp can be still kept stable. The method is especially suitable for the LED power-saving lamp which can be directly butted with the alternative current commercial power and has LED open circuit damage protection.

The invention provides an AMOLED driving system and a driving method. The AMOLED drive system adds a test pixel (5) and a compensation unit (4), obtains the brightness of the test pixel (5) through the brightness sensor (42) in the compensation unit (4), and uses the compensation IC (41) to obtain the brightness of the test pixel (5). The brightness calculation of (5) generates a compensation voltage signal (Svn), and the source drive unit (2) sends the compensation voltage signal (Svn) and data signal (Data) to the display unit (1), which can simplify the circuit structure and effectively compensate the driving The threshold voltage of the thin film transistor stabilizes the current flowing through the organic light-emitting diode, ensures uniform luminous brightness of the AMOLED, and improves the display effect of the picture.

The present invention provides an AMOLED pixel driving circuit and its driving method, which adopts a 6T1C pixel driving circuit with a specific driving sequence, can effectively compensate the threshold voltage of the driving thin film transistor, and stabilize the current flowing through the organic light emitting diode , to ensure uniform luminance of organic light-emitting diodes, improve the display effect of the picture, and reduce the number of thin-film transistors and scanning control signals through the combination of N-type thin-film transistors and P-type thin-film transistors, thereby simplifying the structure of the pixel driving circuit and increasing the effective Luminous area.