CN2063241U - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
- Publication number
- CN2063241U CN2063241U CN 90204673 CN90204673U CN2063241U CN 2063241 U CN2063241 U CN 2063241U CN 90204673 CN90204673 CN 90204673 CN 90204673 U CN90204673 U CN 90204673U CN 2063241 U CN2063241 U CN 2063241U
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- crystal display
- light
- lcd
- display device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Abstract
The utility model relates to a liquid crystal display, which comprises a liquid crystal display element (1), a background light source (2) arranged at the back of the liquid crystal display element (1) and an optical control circuit (3). The optical control circuit automatically controls the switching on and the switching off of the background light source along with the brightness of environment, so as to compensate the illuminance of the liquid crystal display element. Therefore, the display can clearly display characters and pictures regardless of the environmental brightness. The utility model improves the displaying performance of liquid crystal displays, therefore, enlarges the range of use of the liquid crystal display.
Description
The utility model relates to the optics display technique, is specifically related to a kind of light-operated backlight LCD.
Liquid crystal display (LIQUID CRYSTAL DISPLAY.Be called for short LCD) the technology develop rapidly, be widely used in many fields such as clock and watch, counter, computing machine and micro-television.LCD device operating voltage is low, power consumption is little, the life-span is long, and firm, easy driving under general display condition selects for use this device can make small-sized, the light-duty and slimming of equipment.But because the LCD device is the passive-type display device of modulated external light, so compare with luminous active illuminating display device (as cathode-ray tube (CRT), fluorescent display tube, electroluminescence, light emitting diode, plasma, laser writer) own, contrast and visual poor, in the dark be difficult to see shown content clearly, limited its range of application.
The purpose of this utility model is the deficiency at above-mentioned liquid crystal display device, designs a kind of LCD that can both clear demonstration under the light and shade environment.
The LCD that comprises liquid crystal display device provided by the utility model, it is characterized in that being provided with one behind by light-operated circuit backlight control, that be used to compensate the liquid crystal display device illuminance at liquid crystal display device, described light-operated circuit comprises light activated element, photoelectric switching circuit and controlled light source circuit.
When the illuminance of environment during less than a certain particular value, light-operated circuit is connected the backlight power supply automatically because of light activated element parameter wherein changes, and compensation is to the illuminance of LCD device; When ambient lighting degree during greater than a certain particular value, light-operated circuit is automatic cutout backlight power supply then, therefore LCD of the present utility model, no matter external environment condition light and shade, LCD shows partly and is in all the time among the suitable lighting environment, and clear display, contrast are big.
The LCD device that the utility model is related can be a transmission-type LCD device, also can be half reflection and half transmission type LCD device, and the utility model recommends to select for use half reflection and half transmission type LCD device.
Backlight described in the utility model is meant and is arranged on the LCD device light-source system in order to compensation LCD device display part illuminance behind, can be the light source of any suitable.For example can be planar light source, as EL luminescent screen or LED luminescent screen, also can be pointolite, but for the homogeneity of guarantee point light source, generally between pointolite and LCD device the plane astigmatism plate is set.
Light-operated circuit described in the utility model belongs to prior art, generally all is made up of light activated element, photoelectric switching circuit and controlled light source circuit three parts.Wherein light activated element should be selected the visible light light activated element for use; Photoelectric switching circuit and controlled light source circuit all are general common circuit, can select for use arbitrarily according to the type of light source.
Fig. 1 is the structural representation of the utility model LCD.
As shown in Figure 1, LCD of the present utility model comprises the liquid crystal display device of being made up of power supply, drive part and display part (1), is arranged on liquid crystal display device (1) backlight (2) and the interior light-operated circuit (3) of housing behind.
Fig. 2 is the synoptic diagram of the light-operated circuit (3) of the utility model LCD.
As shown in the figure, light-operated circuit comprises light activated element (4), photoelectric switching circuit (5) and controlled light source circuit (6).Light activated element in the light-operated circuit (4) parameter changes with the light and shade of environment, automatically control the switching of backlight by photoelectric switching circuit (5) and controlled light source circuit (6), make liquid crystal display device be in work under the bright environment all the time, thereby reach the purpose of clear demonstration.
Fig. 3 is with the light-operated circuit figure of EL screen as backlight.
Select 23 * 47mm for use
2EL screen and 25 * 50mm
2The LCD screen.
Among the figure:
R1＝200KΩ C1：10μf，10V
R2＝10KΩ C2：0.047μf，60V
R3＝330Ω BG1：3DG6
R4＝8.2KΩ BG2：3AK13
R：21K1154 BG3：C2002
When exterior light is radiated at illuminance on the photoresistance R greater than a certain particular value * time, the voltage that A is ordered ends BG1, BG2 less than the forward voltage of triode BG1, and the voltage that C is ordered is very low, the oscillatory circuit that BG3, C1, C2, R3, R4 form quits work, and the EL screen extinguishes.
When exterior light was radiated at illuminance on the photoresistance R less than * value, photoresistance R resistance increased, and the A point voltage increases, triode BG1, BG2 conducting, oscillatory circuit work through the transformer rear drive EL screen that boosts, makes it the illuminance of shinny compensation liquid crystal display device.
Fig. 4 is with bulb and the astigmatism plate light-operated circuit figure as backlight.
Select 25 * 50mm for use
2LCD screen and 25 * 50mm
2Astigmatism plate
Among the figure:
R1＝200KΩ BG1：3DG6
R2＝1KΩ L： AC4.5V
R：21K1154 SCR C203D
As shown in FIG., the principle of work of light-operated circuit is to utilize the silicon controlled conducting and by the break-make of controlling the lamp source, make liquid crystal display device be in work under the bright environment all the time to shown in Figure 3 similar, reaches the purpose of clear demonstration.
Liquid crystal display of the present utility model is provided with light-operated backlight behind at existing liquid crystal display device, the lighting environment of energy auto-compensation liquid crystal display device, display performance and the contrast of available liquid crystal display device have greatly been improved, even in the dark, light is soft in the LCDs, character or clear image, therefore the liquid crystal display scope of application of the present utility model is wide, has broad application prospects.
Claims (4)
1, a kind of LCD that comprises power supply, drive part and display part, it is characterized in that: the behind of liquid crystal display device (1) is provided with one by light-operated circuit (3) backlight (2) control, that be used to compensate liquid crystal display device (1) illuminance, and described light-operated circuit comprises light activated element (4), photoelectric switching circuit (5) and controlled light source circuit (6).
2, LCD as claimed in claim 1 is characterized in that: liquid crystal display device (1) is a half reflection and half transmission type liquid crystal display device.
3, LCD as claimed in claim 1 or 2 is characterized in that: backlight (2) is a planar light source.
4, LCD as claimed in claim 1 or 2 is characterized in that: backlight is the pointolite that disperses through the plane astigmatism plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90204673 CN2063241U (en) | 1990-04-12 | 1990-04-12 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90204673 CN2063241U (en) | 1990-04-12 | 1990-04-12 | Liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2063241U true CN2063241U (en) | 1990-10-03 |
Family
ID=4885595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90204673 Withdrawn CN2063241U (en) | 1990-04-12 | 1990-04-12 | Liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2063241U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1119774C (en) * | 1993-03-25 | 2003-08-27 | 能美防灾株式会社 | Fire receiver |
-
1990
- 1990-04-12 CN CN 90204673 patent/CN2063241U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1119774C (en) * | 1993-03-25 | 2003-08-27 | 能美防灾株式会社 | Fire receiver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |