CN100468509C

CN100468509C - Driving device for displaying screen

Info

Publication number: CN100468509C
Application number: CN 200510002863
Authority: CN
Inventors: 周进文; 郑英男; 吴光明
Original assignee: Xinju Enterprise Co Ltd
Current assignee: Xinju Enterprise Co Ltd
Priority date: 2005-01-25
Filing date: 2005-01-25
Publication date: 2009-03-11
Anticipated expiration: 2025-01-25
Also published as: CN1811887A

Abstract

This invention discloses a driver of a display screen, which integrates the drive circuits of the display screen and the backlight module set to make the image display time sequence of the screen to match up with the bright and dark sequence of the lumen scale of the variance period of the backlight module set so as to increase the quality of images displayed by the screen.

Description

The drive unit of display screen

Technical field

The present invention relates to a kind of drive unit of display screen, particularly a kind of drive unit of reached raising display screen image frame quality of the display screen that is applied to possess back side light source irradiation.

Background technology

Utilize the liquid crystal cells molecule to reverse the LCDs (LCD) of video picture, application on various electronic product is extensive day by day, and after adding audio-video playing function, the dynamic image image quality of LCDs just becomes the main factor of judgment that the user selects LCD.

When LCDs is carried out image processing at present, the color of often finding LCD screen is true inadequately, and its main cause is the influence that " reaction time " and " contrast " is caused, the alleged herein reaction time (response time) refer to a liquid crystal cells (liquidcrystal cell) from luminous to not luminous, return the required time of luminance.Briefly, be exactly that a pixel is by the black required time of the black Bai Zaizhuan of commentaries on classics.Reaction time, the reaction time was long more with millisecond meter, and the reaction of screen is just slow more.The output of this and image also has direct relation, for example screen of a 20ms, and per second can present 50 (I/0.020) by the bright image of blackout, or is equivalent to amount to 100 image.Aforementioned contrast refers to the brighteness ratio between the darkest and bright spot of image.Contrast highly more, screen just can present the gradually layer of bright inner room more.With regard in fact, the gray layer time number that on behalf of screen, this numeral also can present.

But, with regard to prior art, because time of reversing of liquid crystal cells is greater than the reaction time of display screen, therefore, when display screen conversion image frame, last picture still has little time to reply and frame update, therefore, will produce hangover or ghost phenomena etc. influences the image quality generation, but if the reaction time prolongation, then will cause display frame to have hysteresis phenomenon to produce, this phenomenon especially is easier to take place when the user is engaged in animated gaming or views and admires Film Animation.

Summary of the invention

The technical problem to be solved in the present invention is to overcome the defective that exists in the above-mentioned prior art, and a kind of drive unit of display screen of reached raising display screen image frame quality of the display screen that is applied to possess back side light source irradiation is provided.

For this reason, the drive unit according to display screen of the present invention comprises: a module backlight and a driving circuit thereof in order to the back light of control display screen, makes module backlight present the bright dark sequential of lumen degree thereby driving circuit possesses a mode that produces the brightness period of change; One display screen and driving circuit thereof, image frame in order to control display screen changes, driving circuit possesses a corresponding brightness period of change and produces the mode of image display timing generator, thereby makes the bright dark sequential of lumen degree of the corresponding module backlight of image display timing generator and improve the image frame quality of display screen.

Drive unit according to display screen of the present invention is integrated the driving circuit of display screen and the driving circuit of module backlight, allows both image display timing generators and the bright dark sequential of lumen degree arrange in pairs or groups mutually, to reach the effect that improves display screen image frame quality.

Description of drawings

Fig. 1 is a function block schematic diagram of the present invention;

Fig. 2 is the synoptic diagram of module driving electric backlight of the present invention; And

Fig. 3 is the synoptic diagram of module brightness period of change backlight of the present invention.

Embodiment

Relevant detailed description of the present invention and technology contents, existing accompanying drawings is as follows:

See also shown in Figure 1, it is function block schematic diagram of the present invention, as shown in the figure: the present invention is a kind of drive unit of display screen 20, include a module 10 backlight and a driving circuit 11 thereof, in order to the back light of control display screen 20, this driving circuit 11 possesses the mode of a generation brightness period of change T and makes this module 10 backlight present the bright dark sequential t1 of lumen degree, t2; And a display screen 20 and a driving circuit 21 thereof, image frame in order to control display screen 20 changes, this driving circuit 21 possess a pair of should brightness period of change T and produce the mode of image display timing generator, make this image display timing generator to the bright dark sequential t1 of lumen degree, t2 that should module 10 backlight and improve the image frame quality of display screen 20.

Please consult shown in Figure 2 simultaneously, the mode of aforementioned generation brightness period of change T is that the driving circuit 11 by module 10 backlight comprises the inverter of an output changing voltage V and driven by this changing voltage V and produce the lamp group that brightness changes according to the size of this changing voltage V and realizes, the lamp group can be planar light source lamp or cold cathode fluorescent lamp, inverter then can be piezoelectric type inverter or Wound-rotor type inverter, present embodiment is that example describes with the output driving electric waveform of piezoelectric type inverter then, from figure, can obviously find out, the driving voltage of inverter output is changing voltage V, drive current is the change electric current I, therefore, the lamp group will produce different brightness and change under the driving of the changing voltage V of different sizes, and changing greatly I, this brightness distinguishes the bright dark sequential t1 of first-class lightness according to the light-source brightness capable of displaying image of display screen 20, t2, less in the t1 sequential because of the input driving voltage, so the lamp group be invisible light than half-light source state, in the t2 sequential then is the visible light state on the contrary, and the signal of this brightness period of change T will be obtained by the driving circuit 21 of display screen 20, and by the lumen degree bright dark sequential t1 of this driving circuit 21 according to this module 10 backlight, t2 and arrange the image display timing generator, the mode of this generation image display timing generator then can reach by the mode of rank scanning line, like this, can reach the purpose of the image frame quality that improves display screen 20.

See also shown in Figure 3, be that with the discrepancy of Fig. 2 the mode of this generation brightness period of change T is the inverter that comprises an outputting drive voltage by the driving circuit 11 of module 10 backlight, the light adjusting circuit of one output energy/sequential modulating signal controlling and driving voltage swing, and be subjected to this driving voltage to produce the lamp group that brightness changes and realize, the mode that present embodiment adopts a light adjusting circuit to reach brightness period of change T is that example describes, from figure, can obviously find out, this brightness period of change T is by a plurality of summation ENERGY E a that do not become simultaneously, Eb, the light signal of Ec is formed, become summation ENERGY E a when indicating among the figure〉Eb Ec (time become summation ENERGY E a, Eb, the detailed technology content of Ec please refer to the patent of invention of TaiWan, China that the applicant proposes and get permission I221051 number), so in this brightness period of change T, the lamp group will present the bright dark sequential t1 of various flows lightness, t2, and this brightness period of change T signal also will be obtained by the driving circuit 21 of display screen 20, and by this driving circuit 21 according to the bright dark sequential t1 of the lumen degree of this module 10 backlight, t2 and arrange the image display timing generator, like this, can reach the purpose of the image frame quality that improves display screen 20.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All in the spirit and principles in the present invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the drive unit of a display screen (20) is characterized in that comprising:

One module backlight (10) and driving circuit (11) thereof, in order to controlling the back light of described display screen (20), described driving circuit (11) possess one produce brightness period of change (T) thus mode make described module backlight (10) present the bright dark sequential of lumen degree (t1, t2);

One display screen (20) and driving circuit (21) thereof, change in order to the image frame of controlling described display screen (20), described driving circuit (21) possesses a corresponding described brightness period of change (T) and produces the mode of image display timing generator, makes the bright dark sequential of described lumen degree (t1, t2) of the corresponding described module backlight of described image display timing generator (10) and improves the image frame quality of described display screen (20).

2. the drive unit of display screen according to claim 1 (20), the mode that it is characterized in that described generation brightness period of change (T) are that the driving circuit (11) by described module backlight (10) comprises the inverter of an output changing voltage (V) and driven by described changing voltage (V) and produce the lamp group that brightness changes according to the size of described changing voltage (V) and realizes.

3. the drive unit of display screen according to claim 1 (20), the mode that it is characterized in that described generation brightness period of change (T) are to comprise that by the driving circuit (11) of described module backlight (10) inverter of an outputting drive voltage, the light adjusting circuit of an output energy/sequential modulating signal controlling and driving voltage swing and the lamp group that is subjected to described driving voltage to produce the brightness variation realize.

4. the drive unit of display screen according to claim 1 (20), the mode that it is characterized in that described generation image display timing generator are that the mode by the rank scanning line realizes.