CN202394503U

CN202394503U - A liquid crystal display

Info

Publication number: CN202394503U
Application number: CN201120377354XU
Authority: CN
Inventors: 尤福宽; 徐佳平; 吴斌; 王彪
Original assignee: TIANCHANG KUANREN ELECTRONICS CO Ltd
Current assignee: TIANCHANG KUANREN ELECTRONICS CO Ltd
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-08-22
Anticipated expiration: 2021-09-28

Abstract

The utility model discloses a liquid crystal display. The liquid crystal display comprises a liquid crystal screen, a backlight plate and a drive plate. The voltage of the liquid crystal screen is adjusted to be the 4-order BIAS offset voltage in terms of the order resistance ratio of a circuit. The backlight plate is electrically connected with the liquid crystal screen, and is used for converting the direct current output by the drive plate into the high-frequency high-voltage alternating current that is needed by the liquid crystal screen so that the backlight lamp of the liquid crystal screen is lightened. The drive plate is electrically connected with the liquid crystal screen and the backlight plate respectively, and is used for receiving and processing analog or digital video signals received by a video interface, and for sending the signals via a screen line to control the work of the liquid crystal screen. According to the liquid crystal display, 3.3V low-voltage drive is supported without an extra power supply circuit, and a temperature compensating circuit is established directly on an input terminal of contrast adjustment for the function of temperature compensation, thereby minimizing utilization of a negative voltage device and reducing the cost.

Description

A kind of LCD

Technical field

The utility model relates to the display technology field, is specifically related to a kind of LCD.

Background technology

LCD (Liquid Crystal Display, LCD) is the display device of planar ultra-thin, and the employing liquid crystal is a material.Under electric field action, the variation that liquid crystal molecule can be arranged, thus its light variation is passed through in influence, and the variation of this light can show as the variation of light and shade through the effect of polaroid.People change through the light and shade of the control of electric field finally having been controlled light, thereby reach the purpose of display image.

From the structure of LCD, no matter be notebook computer or desktop system, the hierarchy that the LCD display of employing all is made up of different piece.LCD is made up of two glass plates, and the thickness specification has 0.7mm, 0.63mm, and 0.5mm (also can accomplish thinner) through the mode of physics or chemical reduction, evenly spaced by 3～5 μ m that include liquid crystal (LC) material therebetween.Because liquid crystal material itself is not luminous; So need dispose additional light source to display screen; A LGP (or claiming even tabula rasa) and reflective membrane are arranged at the LCDs back side, and the main effect of LGP is that line source or pointolite are converted into the area source perpendicular to display plane.The light that backlight sends gets into liquid crystal layer after passing the ground floor polarization filter layer.Quartzy drop in the liquid crystal layer all is comprised in the tiny cell structure, and one or more cells constitute a pixel on the screen.Between glass plate and liquid crystal material, be transparent electrode, electrode is divided into row and column, and on the point of crossing with row of being expert at, through changing the optically-active state that voltage changes liquid crystal, the effect of liquid crystal material is similar to one by one little light valve.At the liquid crystal material periphery is control circuit part and driving circuit section.When the electrode among the LCD produced electric field, liquid crystal molecule will produce distortion, thereby the light that will pass through wherein carries out well-regulated refraction, and the filtration through second layer filtering layer shows on screen then.

Can know by above-mentioned principle; LCD is to bring in through use one group of power supply and data-signal and read-write are provided; Nation fixes on and handles in inside after integrated circuit on the PCB (printed-wiring board (PWB)) receives signal; Convert the voltage signal that can make the liquid crystal aligning upset to, and accomplish the demonstration of data on LCDs through the mode of dynamic scan.

Yet the LCD of prior art is general supports 3.7 volts above driven, though also can support 3.3V to drive, must increase extra negative pressure circuit, just can be under the state of low-voltage driven, make the circuit structure complicacy.

In addition, the LCD of prior art generally all adopts the mode of thermistor adjustment negative pressure output to realize temperature compensation function, causes circuit structure complicated equally.

The utility model content

To above-mentioned defective; The utility model purpose is to have proposed a kind of LCD; Need not increase the negative pressure circuit just can be under the state of low-voltage the driven display, and directly set up temperature-compensation circuit at the input end of contrast adjustment, reduced the complicated circuit degree.

For realizing above-mentioned purpose, the utility model is realized through following technical scheme:

The utility model provides a kind of LCD, comprising: liquid crystal display, backlight and drive plate,

Said liquid crystal display is adjusted into the BIAS bias voltage on 4 rank on stratum's resistance proportioning of circuit;

Said backlight is electrically connected with said liquid crystal display, is used for the DC voltage of drive plate output is changed into the high-frequency and high-voltage alternating current of liquid crystal display needs, is used to light the backlight of liquid crystal display;

Drive plate is electrically connected with said liquid crystal display and backlight respectively, is used to receive, handle the analog or digital vision signal that is received by video interface, and sees the said liquid crystal display work of signal controlling off through the screen line.

Preferably, it is backlight that said backlight adopts the luminous yellow green LED of side.

Preferably, also comprise temperature-compensation circuit, direct input end in contrast adjustment.

Preferably, also comprise chase, it is the oblique angle that the ccontaining printing board PCB that is equipped with the driving circuit of liquid crystal display and drive plate, said chase fall pin.

Preferably, be provided with reference column between said chase and the PCB.

Compared with prior art, the utlity model has following beneficial effect:

The LCD of the utility model is under the situation that need not the additional power supply circuit; Support the low voltage drive of 3.3V, when directly importing the DC voltage of 3.3V, can be through the adjustment of the stratum's resistance in the circuit; The magnitude of voltage that adapts to input is to reach best display effect.

The LCD of the utility model is directly set up temperature-compensation circuit at the input end of contrast adjustment aspect temperature-compensation circuit, realize temperature compensation function, and this design has reduced the utilization of negative pressure device, has reduced cost.

Description of drawings

According to embodiment and accompanying drawing the utility model is done further explain below.

Fig. 1 is the structural drawing of a kind of LCD of the utility model proposition;

Fig. 2 is the temperature-compensation circuit figure in a kind of LCD of the utility model proposition;

Fig. 3 is PCB and the structural representation of package frame of a kind of LCD of prior art;

Fig. 4 is the PCB of a kind of LCD of the utility model proposition and the structural representation of package frame.

Embodiment

Be illustrated in figure 1 as a kind of LCD that the utility model proposes, comprise:

Liquid crystal display is the core component of LCD, comprises liquid crystal board and driving circuit.Basic specification: 16*2 character type STN, positive, half passes through 1/16 duty, 1/5Bias.

LCDs adopts the STN type, and the ITO cabling adopts symmetrical manner, efficiently solves and 12 shared problems on the visual angle at 6.In the voltage design of display screen, use the mode of low-voltage, be set at 1/5BIAS, the voltage of 3.7V; When input supply voltage is 3.3V; On stratum's resistance proportioning of circuit, be adjusted into the BIAS voltage on 4 rank, so just reduced the driving voltage of liquid crystal, when supply voltage is input as 3.3V; LCD can normally show, when the utilization low voltage drive, does not need extra power circuit.

Backlight is used for the DC voltage of drive plate output is changed into the high-frequency and high-voltage alternating current of liquid crystal display needs, is used to light the backlight of liquid crystal display.Wherein, the luminous yellow green LED of employing side backlight (light emitting diode) is backlight, the yellow green of prior art employing bottom-emission backlight form; Use 20 above LED lamps as light source, its current value is more than 100mA, and the utility model adopts high bright orange green LED; It is luminous to be designed to side; Its light source is counted 2dices, and its current value is 40mA, and its brightness value and uniformity coefficient and bottom light are suitable.

Drive plate is used to receive, handle the analog or digital vision signal that is received by video interface, and sees signal off through the screen line and go to control the liquid crystal display operate as normal.

Wherein, LCD control and chip for driving adopt the ST7066 and the ST7065 of Taiwan silicon wound; Backlight control circuit adopts the power supply input of multiple mode, makes the client that better choice arranged; The contrast adjustment circuit has designed simple temperature-compensation circuit.

The temperature-compensation circuit of the utility model has increased wire jumper over the ground, when LCD WV during less than supply voltage, can use the negative pressure module, and is as shown in Figure 2: temperature-compensation circuit is by RT, RT1, and R7, R8, R12 and Q1 (PNP triode) form.RT1 is a thermistor, and its resistance can be selected according to the characteristic of LCD, RT, and R7, R8 adjust the curve of voltage versus temperature.Account form is following:

Measure the WV of a plurality of temperature spot LCD, can choose 5 points ,-20 degree WV VOP1,0 degree WV VOP2,25 degree WV VOP3,50 degree WV VOP4,70 degree WV VOP5.

Select the model of RT1, look into the resistance RT1～RT5 to above each temperature spot of specifications parameter

VOP＝VCC-VEE，VEE＝VCC-VOP

The voltage VB=VEE-0.7V of Q1 base stage (triode pressure drop)

VB/R8＝VCC/((RT1//RT)+R7+R8)

According to 5 groups of data of above each temperature spot, just can in the hope of with the checking RT, R7, the value of R8.

In addition, in the utility model, the chase of ccontaining PCB adopts black coating, prevents the situation of its oxidation and rusting.Chase falls pin and has adopted the oblique angle design; Is that 0.4mm compares with PCB among prior art Fig. 3 with the gap of chase; The chase design of the utility model as shown in Figure 4, the gap of PCB and chase is 1.4mm, can avoid circuit or the grout short circuit of chase and PCB; The circuit gap can be increased, the ESD ability can be increased.In addition, designed reference column between chase and the PCB, be easier to assembling, can enhance productivity.

The LCD of the utility model is under the situation that need not the additional power supply circuit; Support the low voltage drive of 3.3V fully, when directly importing the DC voltage of 3.3V/5V, can be through the adjustment of the stratum's resistance in the circuit; The magnitude of voltage that adapts to input is to reach best display effect.

The LCD of the utility model also is superior to prior art aspect temperature-compensation circuit, directly set up temperature-compensation circuit at the input end of contrast adjustment, realizes temperature compensation function, and this design has reduced the utilization of negative pressure device, has reduced cost.

Combine accompanying drawing that the utility model has been carried out exemplary description above; Obviously the realization of the utility model does not receive the restriction of aforesaid way; As long as adopted method design of the utility model and the various improvement that technical scheme is carried out; Or the design of the utility model and technical scheme are directly applied to other occasion without improving, all in the protection domain of the utility model.

Claims

1. a LCD is characterized in that, comprising: liquid crystal display, backlight and drive plate,

2. LCD as claimed in claim 1 is characterized in that, said backlight adopts the luminous yellow green LED of side backlight.

3. LCD as claimed in claim 1 is characterized in that, also comprises temperature-compensation circuit, direct input end in contrast adjustment.

4. LCD as claimed in claim 1 is characterized in that, also comprises chase, and it is the oblique angle that the ccontaining printing board PCB that is equipped with the driving circuit of liquid crystal display and drive plate, said chase fall pin.

5. LCD as claimed in claim 4 is characterized in that, is provided with reference column between said chase and the PCB.