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

The invention provides an AMOLED drive system and a drive method. The AMOLED drive system is additionally provided with a test pixel (5) and a compensation unit (4), brightness of the test pixel (5) is obtained through a brightness sensor (42) in the compensation unit (4), a compensation voltage signal (Svn) is calculated and generated through a compensation IC (41) according to the brightness of the test pixel (5), and a source pole drive unit (2) sends the compensation voltage signal (Svn) and a data signal (Data) to a display unit (1). The circuit structure can be simplified, a threshold voltage driving a thin-film transistor is effective compensated, a current flowing through an organic light-emitting diode is stable, light-emitting brightness of an AMOLED is guaranteed to be uniform, and a display effect of a frame is 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.

In an apparatus for driving a luminescent display panel, in a state in which scanning lines are sequentially scanned to drive and illuminate light-emitting elements, a voltage peak value arising in a scanning line in a non-scanning state is held by a capacitor through parasitic capacitance of the light-emitting element in a non-scanning state. On the basis of the voltage value held by the capacitor, a reverse bias voltage to be output from a reverse bias voltage generation circuit is controlled, and the voltage is supplied to the scanning lines.

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 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 in a 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 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 relates to blue light emitting fluophor. The invention a CMS:Eu2+ blue light emitting fluophor which is not difficult to cause reduce of light emitting brightness by attachment of elements such as mercury in a condition that the invention is used for a cold cathode fluorescence lamp using mercury gas in discharge gas. The blue light emitting fluophor is formed by the blue light emitting fluophor particle with basic formation represented by CaMgSi2O6:E2+ covered by a capsule comprising alumina oxide in a mass part scale of 4 to 18 related to 100 mass parts of the blue light emitting fluophor particles.

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 invention provides an AMOLED pixel drive circuit and a driving method thereof. The pixel drive circuit with a 6T1C structure is employed with a specific drive time sequence, so that threshold voltages for driving thin film transistors can be effectively compensated for and currents flowing through organic light emitting diodes are stable, the light emitting brightness of the organic light emitting diodes is uniform and an image display effect is improved; through the cooperation of N-type thin film transistors and P-type thin film transistors, the numbers of thin film transistors and scanning control signals are reduced, the structure of the pixel drive circuit is simplified and an effective light emitting area is increased.

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 temperature compensation method for display brightness. The temperature compensation method comprises the following steps of 1) acquiring an ambient temperature, 2) obtaininga current brightness mode, 3) looking up a table according to the current brightness mode and the ambient temperature to obtain a voltage compensation value, and 4) transmitting the voltage compensation value to a voltage driver. A plurality of groups of temperature compensation LUTs are added in the temperature compensation system of the OLED display system, and a group of compensation methods are disclosed to carry out temperature compensation on the OLED display system under different temperatures and different brightness modes, so that the problem that the luminous brightness of the OLEDdisplay system is changed along with the temperature is solved, and the luminous brightness of the display system under various scenes is stabilized.

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 discloses a light emitting diode driving system and a backlight module with the light emitting diode driving system. The light emitting diode driving system is equipped on a circuit board with at least one light emitting diode and includes: a temperature detection module connected with the light emitting diode and including a thermoelectric conversion unit; a hysteresis voltage module electrically connected with the temperature detection module; and a current limiting module electrically connected with the hysteresis voltage module and the light emitting diode. Heat generated by the light emitting diode during work is transferred into the thermoelectric conversion unit and temperature of the thermoelectric conversion unit changes to generate of correspondent voltage; the hysteresis voltage module receives the voltage and generates a hysteresis voltage; and the current limiting module receives the hysteresis voltage and generates a driving current to drive the light emitting diode.

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.

Embodiments of the invention provide an FED (Field Emission Display) pixel driver, an FED display panel and a display device, and relate to the technical field of display. The FED pixel driver comprises a cathode, a drive module, and a modulation and demodulation module. The drive module is connected with the modulation and demodulation module, and is used for providing an opening or closing signal under the control of the modulation and demodulation module. The drive module is further connected with a reference potential input end used for providing reference potential, the cathode, and a grounding end, and is used for driving electrons of the cathode to escape and generate constant emission current in the open state under the control of the reference potential input end and the grounding end. The FED pixel driver, the FED display panel and the display device are used in display.

An image display device which has a stable luminous brightness among pixels. An on / off control switch 15 for stopping the driving operation of a light emitting element 13 is provided in a pixel 1 . A change in the luminous brightness caused by a variation in the characteristic of the light emitting element 13 is suppressed by feeding a result measured by a current measuring circuit provided in one end of a power line 4 back to a drive signal for the light emitting element 13.

The present invention is the driving organic electroluminescent display structure with stable lighting strength. The driving organic electroluminescent display includes one thin film transistor (TFT) structure and one organic LED structure, and has improved TFT protecting layer structure to lower TFT leakage current and to stabilize the lighting strength of the organic LED.

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 application relates to a method, device, circuit, LED lamp and storage medium for controlling the brightness of an LED light source. Wherein, the LED light source brightness control method includes: obtaining the current voltage of the power supply battery of the LED light source; determining the discharge stage of the power supply battery according to the current voltage; determining the pulse width modulation signal according to the current voltage and the discharge stage The duty ratio target value and the duty ratio adjustment period; adjust the pulse width modulation signal according to the duty ratio target value and the duty ratio adjustment period, and the pulse width modulation signal is used to control the brightness of the LED light source . The method for controlling the brightness of the LED light source provided in the present application can improve the accuracy of controlling the brightness of the light source and improve the control effect.

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 provides a pixel driving circuit and a driving method thereof, a display panel and a display device, and relates to the technical field of display, the pixel driving circuit comprises a driving transistor, a light-emitting element and at least one switch transistor module; the driving transistor is used for driving the light-emitting element. The gate of the driving transistor is connected with the first node. The switch transistor module comprises a first transistor unit and a second transistor unit which are connected in parallel, one end of the first transistor unit is connected with the first node, and one end of the second transistor unit is connected with the first node; when the switch transistor module jumps from the on state to the off state, a first leakage current potential of the first transistor unit to the first node is opposite to a second leakage current potential of the second transistor unit to the first node; through the offset between the second leakage current and the first leakage current, the influence of the leakage current on the potential of the first node is reduced or eliminated, so that the stable light-emitting effect of the light-emitting element is ensured, and the screen shaking phenomenon of the corresponding display panel is avoided.

A pixel circuit comprises a capacitor, a first transistor, a second transistor, a third transistor and a sixth transistor. The first end, the control end and the second end of the first transistor arerespectively coupled with the first to third nodes. The first end of the second transistor receives a data signal. The second end of the second transistor is coupled to the third node. The first andsecond ends of the third transistor are coupled to the first and second nodes, respectively. The first end of the fourth transistor receives a system high voltage. The second end of the fourth transistor is coupled to the first node. The first end and the second end of the fifth transistor are coupled with the third node and the light-emitting element respectively. The first end of the sixth transistor is coupled to the second end of the fifth transistor. The second end of the sixth transistor receives a reference voltage. The capacitor is coupled between the second node and the first end of the sixth transistor. The second transistor and the third transistor are simultaneously turned on and off.

The invention discloses a method for temperature compensation of display brightness, comprising the following steps: 1) obtaining the ambient temperature; 2) obtaining the current brightness mode; 3) obtaining a voltage compensation value according to the current brightness mode and ambient temperature; 4) converting the voltage The compensation value is sent to the voltage driver. The invention adds multiple sets of temperature compensation LUTs to the temperature compensation system of the OLED display system, and discloses a set of compensation methods to perform temperature compensation on the OLED display system at different temperatures and different brightness modes, so as to solve the problem that the luminous brightness of the OLED display system changes with temperature problems, and then stabilize the luminance of the display system in various scenarios.

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.