External light screening device of back projection TV

A technology of shielding device and external light, applied in color TV parts, TV system parts, TV and other directions, can solve problems such as inability to recognize test signals, and achieve the goal of improving recognition rate, preventing interference and improving success rate. Effect

Inactive Publication Date: 2006-12-13
LEIJIN ELECTRONIC SHENYANG CO LTD
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AI Technical Summary

Problems solved by technology

[0026] Because the light-sensing device of the rear-projection TV based on the traditional technology is exposed to external light, the surrounding brightness of the rear-projection TV is too bright, and the test signal cannot be recognized, which will lead to reducing the surrounding brightness before starting the automatic The inconvenience of convergence adjustment

Method used

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  • External light screening device of back projection TV
  • External light screening device of back projection TV
  • External light screening device of back projection TV

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Embodiment Construction

[0042] The device for improving the automatic convergence function of the rear projection TV will be described in detail below with reference to the accompanying drawings.

[0043] Refer to the diagram showing the first, fourth and sixth sensing parts 11, 14 and 16 Figure 7 The external light shielding device for the rear projection TV is explained as follows.

[0044] Such as Figure 7 As shown, the screen displaying R, G, B image signals and the first, fourth and sixth sensing parts 11, 14 and 16 installed on the specific position of the above screen and judging the display mode are equipped with the first and second photosensitive devices. 1. Cut off the first, fourth and sixth external light-shielding devices 101, 104 and 106 sensed by the first, fourth and sixth sensing parts 11, 14 and 16, and install them on the first, fourth and sixth sensing parts 11 at the designed angle , 14 and 16 outside.

[0045] In addition to the first, fourth and sixth sensing parts 11, 14...

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Abstract

The invention relates to an external light shield of back projection TV, which comprises: the external light shield is mounted at the outside of first to eighth sensors at preset angle to cut the external light sensed by the first to eighth sensors (11-18), at the screen that displaying R, G, B image signals, while the first to eighth sensors with first and second light sensitive elements contains sense display modes. The invention can cut off the external light and improve the signal recognize rate when its automatic focus function is turned on.

Description

technical field [0001] The invention relates to a rear-projection television, in particular to an external light shielding device for a rear-projection television. Background technique [0002] Generally speaking, there are various types of TVs ranging from 14-inch small analog TVs to rear-projection TVs over 60 inches. Among them, rear projection TV refers to a TV that projects R, G, and B colors on the screen using their corresponding picture tubes. The perceptual quality of this rear projection TV includes W / U (White Uniformity), B / U (Bright Uniformity), Convergence, Focus, Distortion and many other items. [0003] Here, the so-called convergence adjustment refers to the process in which the R (RED), G (GREEN), and B (BLUE) beams emitted by the electron gun converge to a certain point through the magnetic field of the deflection yoke. If the deflection yoke is abnormal or under the influence of the magnetic field, the beam does not deflect according to the set position,...

Claims

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Application Information

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IPC IPC(8): H04N5/74
Inventor 赵殷亨
Owner LEIJIN ELECTRONIC SHENYANG CO LTD
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