47results about How to "Reduce backlight power consumption" patented technology

A liquid crystal display apparatus includes a liquid crystal display panel having a liquid crystal layer held between a pair of substrates; and a light source, a whose brightness of which is controllable, wherein the liquid crystal display apparatus further includes a unit for generating an image signal with a signal for controlling the liquid crystal layer configured in a display area of a frame-based pixel configuration and with a signal for controlling the light source configured in a blanking interval of the frame-based pixel configuration.

An image display apparatus includes a dimming value determination circuit for determining a dimming value of a backlight based on an input image signal, an image signal compensation circuit for compensating the input image signal supplied to a liquid crystal panel in accordance with the dimming value, and a backlight drive circuit for driving and controlling the backlight in accordance with the dimming value. When the light emitting luminance of the present frame of the backlight increases relative to the light emitting luminance of the previous frame, the backlight drive circuit delays the timing for applying the dimming value of the present frame. This makes it possible to reduce power consumption of the backlight by suppressing deterioration in the image quality in spite of the sharp change in the display image luminance.

The invention discloses a backlight control method for liquid crystal display devices. The method comprises the following steps: a brightness control unit receives an image signal, increases the gray-scale brightness of the image signal according to a first proportion, generates a corresponding driving voltage through control, and inputs the driving voltage to a backlight module to reduce the backlight brightness according to the first proportion; and the brightness control unit further receives a frame control time sequence signal and/or line control time sequence signal, and the brightness control unit stops outputting the driving voltage to the backlight module within a first blanking time and/or a second blanking time, wherein the first blanking time refers to the interval time between the end of a nth frame of image signals and the start of a (n+1)th frame of image signals, the second blanking time refers to the interval time between the end of a mth line of signals and the start of a (m+1)th line of signals, and m and n are integers greater than 1. The invention further discloses a liquid crystal display device adopting the backlight control method.

The invention discloses a method and a circuit for driving a backlight light emitting diode (LED) lamp of a television, and the television. The method comprises the following steps of: performing corresponding phase shift time delay processing on a field synchronous signal of the television according to turning time of liquid crystal molecules of a television display screen; performing frequency doubling processing on the field synchronous signal subjected to phase shift time delay, and thus obtaining a first clock control signal of which the frequency is N times the frequency of the field synchronous signal, wherein N is a positive integer and more than or equal to 2; and dividing the first clock control signal into N independent second clock control signals, wherein when the rising edge or the falling edge of the field synchronous signal arrives, the second clock control signals sequentially control N backlight LED lamp strips which are arranged above and below the television to be switched on according to a corresponding time interval. According to the method and the circuit, the problem of cross interference of right and left eyes when the television is in a three-dimensional (3D) state can be solved; furthermore, the display brightness of the television can be improved, and the backlight power consumption of the television is reduced; and aims of saving energy and saving power are fulfilled.

The invention provides a backlight circuit, and a method and a terminal for controlling the voltage of the backlight circuit. The backlight circuit comprises a luminescent device module, a current control circuit module, a switch power module and a processor, wherein the luminescent device module is serially connected with the current control circuit module; the switch power module provides voltage for the luminescent device module; the processor is used for controlling the output voltage of the switch power module in a backlight starting process, and enables the voltage of the current control circuit module to be equal to or slightly greater than the pre-stored corresponding reference voltage of the current control circuit module under the corresponding brightness level. The using voltage can be automatically controlled according to the backlight brightness level, backlight power consumption can be reduced to the maximum degree on the premise that the user experience is unaffected, so that the purpose of saving energy is achieved, and the endurance ability of the terminal is improved.

The invention discloses a backlight module and a display device. The backlight module comprises a light emitting part, a photo-induced light emitting part and a polarization state adjusting part; the light emitting part is used for providing backlight and comprises multiple first subregions, and the light emitting brightness of all the first subregions is different; the photo-induced light emitting part is used for emitting multiple monochromatic lights of which the polarization directions are perpendicular to one another, and the monochromatic lights are compounded into white light to be emitted into the polarization state adjusting part; the polarization state adjusting part is used for adjusting the polarization directions of the monochromatic lights in the white light. According to the backlight module, by means of the combined action of the light emitting part, the photo-induced light emitting part and the polarization state adjusting part, dynamic control over backlight spectra can be achieved, the product color gamut can be widened, and backlight power dissipation can be reduced.

The invention discloses a fully transparent liquid crystal display module which comprises a backlight unit and a fully transparent liquid crystal display arranged above the backlight unit, wherein the fully transparent liquid crystal display also comprises at least an external light source acquisition unit; the external light source acquisition unit is used for acquiring external light rays to the backlight unit. Through adding the external light source acquisition unit on the fully transparent liquid crystal display module, the light source of the fully transparent liquid crystal display module is not only provided by the prior backlight unit, but also provided by the external light source acquisition unit; the luminance of the fully transparent liquid crystal display module can be changed along with the change of the external light source; the fully transparent liquid crystal display module also can realize normal display under the outdoor strong light and has high contrast ratio and good display effect; and the light source of the liquid crystal display module can be better supplied and strengthened, so that the backlight power consumption of the prior backlight unit is saved, thereby achieving the higher luminance. Meanwhile, the fully transparent liquid crystal display module also keeps the characteristics of high opening ratio and high color saturation of the prior fully transparent liquid crystal display module.

The invention belongs to the technical field of light emitting diodes (LED), and discloses a backlight LED driving chip and a time division (TD) terminal. The backlight LED driving chip comprises a charge pump, wherein voltage doubling modes of the charge pump comprise the voltage doubling mode of less than 1.5X. A common anode of the 1.33X voltage doubling mode is adopted to output a plurality of paths of constant current sources so as to adjust the charge pump for backlight driving of a liquid crystal display (LCD) parallel white light; the backlight power consumption of the LCD parallel white light is reduced to be over 40mA; and thus the backlight power consumption is greatly reduced, and the utilization ratio of the power source is also improved.

The invention provides a method for improving pure color image brightness. The method comprises the following steps that a gray scale of a pure color image of an ordinary color gamut displayed by RGB pixels in a quantum dot color gamut is determined according to a Grassmann color law; an R0G0B0 pixel gray scale which is subjected to quantum dot backlight display and replaces the ordinary backlight display pure color image is converted into an R1G1B1W pixel gray scale; environmental comparison is conducted according to an environmental brightness value and a brightness critical value, and whether the brightness value is larger than the brightness critical value or not is judged; when the environmental brightness value is larger than the brightness critical value, a W sub-pixel gray scale is improved by the ratio of a sub-pixel 255 gray scale of the pure color image replaced by the R0G0B0 pixels and a gray scale of the sub-pixels which have the highest gray scale in R sub-pixels, G sub-pixels, B sub-pixels and W sub-pixels, sub-pixel gray scales of other nonzero gray scales are improved equidistantly; a liquid crystal display device is made to improve the brightness of the pure color image according to the adjusted R1G1B1W pixel gray scale.

The invention provides a thin film transistor used in a display panel and the display panel. The thin film transistor comprises a gate and a gate insulation layer, wherein the gate is arranged on a glass substrate in the display panel, the gate insulation layer covers the gate, the gate is arranged on a non-display region of the display panel, an active layer is arranged on the gate insulation layer and is arranged above the gate, the active layer is further provided with a source and a drain, and the gate sequentially comprises a first non-metal layer and a metal layer in a direction far awayfrom the glass substrate. By the thin film transistor, the influence of reflective light can be improved on the premise of no increase on cost of the display panel, the reflectivity is reduced, and the display quality is improved.

The invention provides a Mini-LED backlight partition control system. The Mini-LED backlight partition control system comprises a video signal input module, a data processing and control module, a panel driving display module, a backlight driving module and a backlight display module. According to the method, a deep learning model among the contrast ratio, the power consumption, the system complexity and the backlight partition number is established, and the optimal backlight partition is determined. According to the system, partition images are processed, and a partition dimming algorithm for backlight brightness matrix compensation is combined, so backlight driving signals of partitions are adjusted, and area backlight brightness control matched with image information is realized. The invention has the beneficial effects that a quantitative model of the backlight partition number, the contrast ratio and the power consumption is established, the optimal partition is determined by comprehensively considering the complexity of a partition implementation scheme, and the dimming method of the backlight fuzzy model is adopted, so the real distribution condition of backlight can be reflected more accurately, the dimming accuracy of the Mini-LED area is greatly improved, and the power consumption and the contrast ratio are optimized.

The invention provides a pixel unit and a liquid crystal display device and belongs to the field of liquid crystal display. The pixel unit comprises multiple pixels, multiple grid lines and multiple data lines, wherein the multiple pixels are arrayed in a matrix mode, each pixel comprises a red sub pixel, a green sub pixel, a blue sub pixel, a white sub pixel and a yellow sub pixel; the multiple grid lines are used for receiving scanning signals according to a time sequence, and each grid line is connected with five rows of sub pixels; the data lines are used for receiving data signals, every 5 data lines are connected with 1 column of sub pixels, the first data line is connected with the 5k plus 1 sub pixel of the column of sub pixels, the second data line is connected with the 5k plus 2 sub pixel of the column of sub pixels, the third data line is connected with the 5k plus 3 sub pixel of the column of sub pixels, the fourth data line is connected with the 5k plus 4 sub pixel of the column of sub pixels, the fifth data line is connected with the 5k plus 5 sub pixel of the column of sub pixels, k equals to 0,1,2 ellipsis, K minus 1, and K is one fifth of the total rows of sub pixels. According to the invention, the image quality is effectively improved.

The invention relates to a rapid area backlight adjusting method for an interlaced scanning video. For each image of an interlaced scanning video sequence, a deinterlacing algorithm is utilized to carry out interpolation to acquire a reconstruction image; if an original image of the reconstruction image is an odd field image, the reconstruction image is divided into blocks; sparsity processing on each block is carried out to acquire a pixel data set containing the information amount greater than a set value of the block; gray processing on the acquired pixel data set is carried out; for the data set after gray processing, a subinterval maximum between-class variance method is utilized to acquire a backlight value of each block; smooth operation for the backlight value of each block is carried out to acquire a backlight value after smooth processing; the backlight value is utilized to carry out area backlight adjustment, and liquid crystal compensation is further carried out; if the original image of the reconstruction image is an even field image, the reconstruction image acquired on the basis of an odd field is directly utilized, the backlight value after backlight smooth processing is acquired, and liquid crystal compensation is further carried out. The method is advantaged in that backlight energy consumption is greatly reduced, and video quality is guaranteed.

The invention discloses a control method of a driving circuit, the driving circuit and a light-emitting substrate. The driving circuit is used for a light-emitting substrate, and the control method comprises the following steps: obtaining a wiring voltage drop voltage, a lamp string voltage, a lamp string voltage difference and a channel voltage of the light-emitting substrate, calculating to obtain a target power supply voltage, comparing the target power supply voltage with a power supply output voltage, and generating an adjustment signal according to a comparison result of the power supply output voltage and the target power supply voltage, and adjusting the power supply output voltage according to the adjusting signal so as to match the power supply output voltage with the target power supply voltage. According to the control method, the power supply voltage required by the light-emitting substrate is obtained by obtaining the routing voltage drop voltage, the lamp string voltage, the lamp string voltage difference and the channel voltage, so that the power supply output voltage can be adjusted to be matched with the power supply voltage. Therefore, reactive power loss can be prevented from being increased, and the purpose of reducing backlight power consumption is achieved.