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 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 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 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.