JP2006292800A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector suppressing omission of projected characters. <P>SOLUTION: A nonvolatile memory 1240 in a projector section control circuit 124 is stored with defective pixel information of a liquid crystal panel 122. A projector section control circuit 124 shifts the pixel positions of a group of characters (characters, numbers, symbols, etc.) on the liquid crystal panel 122 during projection so that a projection character has no omission at a defective pixel. The shift range is set to be within 10 rightward and leftward pixels from an initial position. When a coincidence with a character forming pixel position and a white defective pixel position is not solved, even if pixel positions shifts by 10 pixels to the right and the left, respectively, a character formation pixel position on the liquid crystal panel 122, that minimizes the number of matching pixels, is decided as a pixel position at character projection. The pixel positions are shifted by line units. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector that projects an optical image.

  It is known that liquid crystal panels widely used for displays, projectors, and the like generate defective pixels when manufactured. A defective pixel is a pixel that cannot be blocked while light is transmitted or a pixel that cannot be transmitted while light is blocked. Patent Document 1 discloses a technique for making such defective pixels inconspicuous. According to Patent Document 1, an image displayed on a liquid crystal display is shifted so that defective pixels are not conspicuous.

Japanese Patent Laid-Open No. 2004-70009

  In general, defective pixels are more likely to have an adverse effect when displaying a character than when displaying an image. For example, the number “1” and the lowercase letter “l” of the alphabet “L” have a small number of pixels constituting the character, so that the lack of characters due to defective pixels is conspicuous. When a projector is configured using a liquid crystal panel, the projected image is often enlarged, so that the lack of characters is often noticeable.

According to the first aspect of the present invention, there is provided a projector that controls the light emission amount for each pixel to form a light image, and a pixel position of a character group formed on the light image forming element is a light image formation. Projection control means for translating the character group in units of rows or columns in which the character groups are arranged so as to avoid defective pixels included in the element is provided.
According to a second aspect of the present invention, there is provided a projector according to a second aspect of the present invention, wherein a light image forming element that forms a light image by controlling a light emission amount for each pixel and a pixel position of a character group formed on the light image forming element Projection control means for changing the interval of each character in a word consisting of a plurality of characters in units of words so as to avoid defective pixels included in the element.
According to a third aspect of the present invention, there is provided a projector according to a third aspect of the present invention, wherein a pixel position of a light image forming element that forms a light image by controlling a light emission amount for each pixel and a character group formed on the light image forming element is a light image formation. Projection control means for translating the word while maintaining the interval between the characters in the word composed of a plurality of characters so as to avoid defective pixels included in the element is provided.
According to a fourth aspect of the present invention, there is provided a projector according to a fourth aspect of the present invention, wherein a light image forming element that forms a light image by controlling a light emission amount for each pixel, and a pixel position of a character group formed on the light image forming element is a light image formation. Projection control means for changing the size of each character in a word made up of a plurality of characters in units of words so as to avoid defective pixels included in the element.
In the case of the first projection method, (1) the first projection method in which the light emission amount of the pixels forming the character group is set larger than the light emission amount of the pixels forming the background portion different from the character group, The pixel position of the character group avoids the first defective pixel that cannot be controlled while the light emission amount is substantially the minimum value. (2) The background portion in which the light emission amount of the pixels forming the character group is different from that of the character group In the case of the second projection method set to be smaller than the light emission amount of the pixels forming the pixel, the pixel position of the character group is set to avoid the second defective pixel that cannot be controlled while the light emission amount is substantially the maximum value. Control can also be performed. In this case, the projector further includes the number of second defective pixels that cannot be controlled while the light emission amount is substantially maximum, and the number of first defective pixels that are uncontrollable while the light emission amount is substantially minimum. When the number of second defective pixels is smaller than the number of first defective pixels, the first projection method is selected, and the number of first defective pixels is smaller than the number of second defective pixels. In some cases, a projection method selection means for selecting the second projection method may be further provided.

  In the projector according to the present invention, it is possible to suppress the lack of projected characters due to defective pixels of the optical image forming element.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a front view of a projector and a camera-equipped mobile phone 10 according to a first embodiment of the present invention. In FIG. 1, a photographing lens 151 and a projection lens 121 are provided in front of a projector and a camera-equipped mobile phone 10.

  FIG. 2 is a side view of the projector and camera-equipped mobile phone 10 of FIG. In the projector and the camera-equipped mobile phone 10, a display unit 10 a having a photographing lens 151 and a projection lens 121 and an operation unit (base unit) 10 b having a first operation member 106 described later are integrated by a folding hinge member 105. Yes. The hinge member 105 is configured to be rotatable about the rotation axis O as a central axis, and supports an opening / closing angle between the display unit 10a and the operation unit 10b at an arbitrary angle. FIG. 2 shows that the projector and camera-equipped mobile phone 10 are placed on a flat surface such as a table with the surface facing the mounting surface of the first operation member 106 of the base portion 10b as a mounting surface with the opening / closing angle being 90 degrees. The state that is placed.

  FIG. 2 includes a diagram (a cross-sectional view taken along the line AA ′ in FIG. 1) for explaining the internal structure of the projector unit. In FIG. 2, the liquid crystal panel 122 is illuminated by the LED light source 123, and the projection light beam FL is emitted from the projection lens 121. The projector and the mobile phone 10 with a camera project information such as an e-mail or an image toward a screen (not shown) disposed so as to face the projection lens 121. The projector and the camera-equipped mobile phone 10 have a built-in speaker 114 to be described later, and reproduce information such as voice from the speaker 114.

  FIG. 3 is a block diagram illustrating the configuration of the projector and the mobile phone 10 with a camera. In FIG. 3, the display unit 10 a of the projector and camera-equipped mobile phone 10 includes a projector unit 120, a camera unit 150, a main liquid crystal display 111, a sub liquid crystal display 112, a second operation member 113, and a speaker. 114. The operation unit 10b includes a CPU 101, a memory 102, a power supply circuit 103, a communication control circuit 104, an antenna 105, a first operation member 106, a speaker 107, a microphone 108, and an external interface (I / F) 109 and an opening / closing angle switch (SW) 110 are provided, and a memory card 250 is mounted in a card slot (not shown). The memory card 250 is configured to be detachable.

  Based on the control program, the CPU 101 performs a predetermined calculation using signals input from the respective units constituting the projector and the camera-equipped mobile phone 10 to generate control signals for the respective units of the projector and the camera-equipped cellular phone 10. By sending it out, communication operation (including telephone call and data transmission / reception), photographing operation and projection operation are controlled. The control program is stored in a nonvolatile memory (not shown) in the CPU 101.

  The memory 102 is used as a working memory for the CPU 101. The memory card 250 is configured by a non-volatile memory such as a flash memory, and writes, stores, and stores data such as images captured by the camera unit 150 in accordance with instructions from the CPU 101 and mail contents received or transmitted by the communication control circuit 104. Reading is possible. The microphone 108 converts the collected sound into an electrical signal and sends it to the CPU 101. The audio signal data is sent to the communication control circuit 104 during a call and is recorded in the memory card 250 during the shooting mode.

  An external interface (I / F) 109 displays a reproduced image based on a video signal input from an external device such as a video camera on the main liquid crystal display 111 or projects it on the projector unit 120. The signal is converted into image data, and the converted image data is sent to the CPU 101. In addition, the external interface (I / F) 109 converts the input audio signal into audio data and reproduces the converted audio data to the CPU 101 in order to cause the speaker 107 to reproduce the audio based on the audio signal input from the external device. Send it out.

  The power supply circuit 103 supplies necessary power to each unit constituting the projector and the mobile phone with camera 10. The communication control circuit 104 performs wireless communication with an unillustrated mobile phone base station via the antenna 105. The first operation member 106 includes a main switch (not shown), a dial button, a call switch, a menu switch, and the like, and sends an operation signal corresponding to the operation content of each switch to the CPU 101.

  The speaker 114 reproduces an audio signal received by the communication control circuit 104 during a call. Note that the speaker 114 is a receiving speaker, and the speaker 107 to be described later is a reproducing speaker. The opening / closing angle switch 110 sends a signal indicating the opening / closing angle of the folding hinge member 105 to the CPU 101.

  The main liquid crystal display 111 displays information such as images and texts according to instructions from the CPU 101. The text information is the operating state of the projector and camera-equipped mobile phone 10, the operation menu, the contents of mail, and the like. The sub liquid crystal display 112 displays information for notifying an incoming call or mail reception according to a command from the CPU 101. The speaker 107 reproduces sound based on the sound data output from the CPU 101.

  The second operation member 113 includes a release button (not shown), a shooting mode switch, a projection mode switch, and the like, and sends an operation signal corresponding to the operation content of each switch to the CPU 101.

(Projector part)
The projector unit 120 includes a projection lens 121, a liquid crystal panel 122, an LED light source 123, a projector unit control circuit 124, and a lens driving circuit 125. The projector control circuit 124 supplies a drive current to the LED light source 123 according to the projection command output from the CPU 101. The LED light source 123 illuminates the liquid crystal panel 122 with brightness according to the supplied current.

  The projector control circuit 124 further generates a liquid crystal panel drive signal according to the projection data (image data, character data) sent from the CPU 101, and drives the liquid crystal panel 122 with the generated drive signal. Specifically, a voltage corresponding to the image signal is applied to the liquid crystal layer for each pixel. In the liquid crystal layer to which a voltage is applied, the arrangement of liquid crystal molecules changes, and the light transmittance of the liquid crystal layer changes. Thus, the liquid crystal panel 122 generates an optical image by modulating the light from the LED light source 123 according to the projection data.

  The non-volatile memory 1240 in the projector unit control circuit 124 stores defective pixel information of the liquid crystal panel 122. The defective pixel information is data indicating the defect content and the defect position when a defective pixel exists in the liquid crystal panel 122. The defect content is a state where light cannot be blocked while being transmitted (referred to as a white defect), or a state where light cannot be transmitted while being blocked (referred to as a black defect). The defective pixel information is stored in the memory 1240 in the projector control circuit 124 based on the individual inspection data of the liquid crystal panel 122 mounted when the projector and the camera-equipped mobile phone 10 are assembled. The handling of defective pixel information will be described later.

  The lens driving circuit 125 drives the projection lens 121 forward and backward in the optical axis direction based on the control signal output from the projector unit control circuit 124. Thereby, the focusing adjustment of the projected image is performed. The projection lens 121 projects the light image emitted from the liquid crystal panel 122 toward a screen or the like.

  The projector unit 120 projects an image corresponding to any of the following (1) to (3) according to a command from the CPU 101. Whenever an operation signal is input from the projection changeover switch constituting the second operation member 113, the CPU 101 generates the following projection images (1) to (3) from (1) → (2) → (3) → ( 1) The projection data is sent to the projector unit 120 so as to switch cyclically in the order of. However, when an external device is not connected to the external interface (I / F) 109, (3) is skipped.

(1) Mail contents recorded on the memory card 250 and characters indicating incoming calls (2) Reproduced images based on image data recorded on the memory card 250 (3) Video input from the external interface (I / F) 109 Playback image by signal

  When projecting the above (1) or (2), the CPU 101 sequentially reads data from the memory card 250 with the latest recording date (the last recorded data among the recorded data), and reads the read data. It is sent to the projector unit 120. When the memory card 250 is not inserted into the card slot, the data received by the communication control circuit 104 can be directly sent to the projector unit 120.

(Camera part)
The camera unit 150 includes a photographing lens 151, an image sensor 152, a lens driving circuit 153, and a camera unit control circuit 154. As the image sensor 152, a CCD, a CMOS image sensor, or the like is used. The camera unit control circuit 154 drives and controls the image sensor 152 and the lens driving circuit 153 according to a command from the CPU 101, and performs predetermined image processing on an imaging signal (accumulated charge signal) output from the image sensor 152. Image processing includes white balance processing and gamma processing.

  When receiving a zoom control signal from the camera unit control circuit 154, the lens driving circuit 153 drives a zoom lens (not shown) constituting the photographing lens 151 to the tele side or the wide side according to the control signal. The photographing lens 151 forms a subject image on the imaging surface of the image sensor 152. The camera unit control circuit 154 causes the image sensor 152 to start imaging, reads the accumulated charge signal from the image sensor 152 after completion of imaging, performs the above image processing, and sends it to the CPU 101 as image data. The image data captured by the camera unit 150 can be directly sent to the communication control circuit 104.

  Since the present invention is characterized by character projection of characters and numeric symbols among the projection operations by the projector and the mobile phone 10 with a camera, this projection operation will be mainly described.

  The liquid crystal panel 122 is composed of, for example, a monochrome liquid crystal element of 100 pixels × 100 pixels. FIG. 4 is a diagram illustrating character groups formed on part of the liquid crystal panel 122. When 8 pixels × 8 pixels are used as one pixel block and one character is formed per pixel block, 100 characters for a maximum of 10 × 10 pixel blocks can be formed on the liquid crystal panel 122, and 100 pixels × 100 pixels can be formed. The center of the display area is 80 pixels × 80 pixels as an initial display area, and the display area can be moved in units of rows, columns, words, or characters within a range of 10 pixels around the initial display area. In the example of FIG. 4, “Hello! You have mail” is projected with black characters (dark spots) against a white background (bright area with bright spots).

  When data indicating a character is input as projection data, the projector unit control circuit 124 uses a pixel position that forms a character (black character in the example of FIG. 4) on the liquid crystal panel 122 based on the input data, and defective pixel information. It is determined whether or not the indicated defective pixel position (a position of a white defect different from the character color) matches. In the first embodiment, determination is made for each block width in the vertical direction on the liquid crystal panel 122 (that is, for each character column for one line).

  FIG. 5 is a diagram for explaining the pixel position determination, in which a square represents a pixel, and a cross indicates a white defective pixel. The upper character group “Hello!” Indicates the pixel position (initial position) of the character formed on the liquid crystal panel 122 when normal processing is performed based on data input to the projector control circuit 124. Show. According to the description example in the upper part of FIG. 5, the white defective pixels are included in the character forming pixels of “H” and “!”, Resulting in missing characters.

  The projector control circuit 124 in the case of missing characters translates (shifts) one line of characters on the liquid crystal panel 122 by one pixel in the horizontal right direction from the initial position. The character group “Hello!” In the lower part of FIG. 5 indicates the pixel positions of characters formed on the liquid crystal panel 122 after the one-pixel shift process in the right direction. According to the description example in the lower part of FIG. 5, the character forming pixel positions of “H” and “!” Do not coincide with the white defect pixel positions, and character missing does not occur. If the character forming pixel position (the black character display pixel position in one pixel block in the above example) and the white defect pixel position do not match, the projector unit control circuit 124 determines the character forming pixel position at that time as the character is projected. Pixel position.

  If the match between the character forming pixel position and the white defective pixel position is not resolved even if the projector unit control circuit 124 shifts one pixel at a time in the right direction, each of the characters for one line on the liquid crystal panel 122 is horizontally right. Shift one pixel further in the direction. Thereafter, similarly, the projector unit control circuit 124, for example, sets the character of one line on the liquid crystal panel 122 until the match between the character forming pixel position and the white defective pixel position is eliminated, with a shift of 10 pixels as an upper limit. Each is shifted by one pixel in the horizontal right direction. The projector control circuit 124 counts the number of pixels where the character formation pixel position and the white defect pixel position match in each shift state while shifting the character for one line, and stores the count value.

  If the match between the character formation pixel position and the white defect pixel position is not resolved even after shifting to the right by 10 pixels, the projector control circuit 124 converts each of the characters for one line on the liquid crystal panel 122 to the initial value. Translate from the position horizontally one pixel at a time. If the character formation pixel position and the white defect pixel position do not match, the projector unit control circuit 124 sets the character formation pixel position at that time as the pixel position at the time of character projection.

  If the match between the character forming pixel position and the white defective pixel position is not eliminated even if the projector unit control circuit 124 shifts one pixel at a time in the left direction, each of the characters for one line on the liquid crystal panel 122 is horizontally left Shift one pixel further in the direction. Thereafter, similarly, the projector unit control circuit 124, for example, sets the character of one line on the liquid crystal panel 122 until the match between the character forming pixel position and the white defective pixel position is eliminated, with a shift of 10 pixels as an upper limit. Each is shifted by one pixel in the horizontal left direction. The projector control circuit 124 counts the number of pixels where the character formation pixel position and the white defect pixel position match in each shift state while shifting the character for one line, and stores the count value.

  If the match between the character formation pixel position and the white defect pixel position is not resolved even after shifting the left and right pixels by 10 pixels from the initial position, the projector unit control circuit 124 corresponds to the stored minimum count value. The character forming pixel position on the liquid crystal panel 122 to be used is a pixel position at the time of character projection.

  The projector control circuit 124 performs the horizontal shift process described above for the character groups in all rows on the liquid crystal panel 122.

  In actual shift processing, the projector unit control circuit 124 performs the above-described processing on the memory in the projector unit control circuit 124 before projection so that the character image in the process of shift processing is not projected. It is configured. That is, the projector control circuit 124 determines the pixel positions at the time of projection for all the character groups on the liquid crystal panel 122 and then causes the character image to be actually generated on the liquid crystal panel 122.

According to the first embodiment described above, the following operational effects can be obtained.
(1) Since the pixel positions on the liquid crystal panel 122 are shifted so that the pixels forming the projected character (characters, numbers, symbols, etc.) avoid the defective pixels, it is possible to suppress missing characters in the projected image. In the above example, an example in which the pixel position is shifted in the direction in which the character groups are arranged has been described. However, in a different direction (for example, in the example in the upper part of FIG. The same effect can be obtained by shifting to 1 pixel).
(2) Since the shift range of the pixel position is within 10 pixels left and right from the initial position, it is possible to suppress a sense of discomfort felt by the observer due to the shift. In this case, it is more preferable that the shift range is set to the number of pixels in the shift direction (8 pixels in the above example) constituting one pixel block.
(3) If the match between the character formation pixel position and the white defect pixel position is not resolved even after shifting to the left and right by 10 pixels, the character formation pixel position on the liquid crystal panel 122 that minimizes the number of matching pixels is determined. Since it is set as the pixel position at the time of character projection, the influence of a defective pixel can be suppressed to the minimum.
(4) Since the horizontal shift is performed in units of lines, the word spacing in the lines is maintained, and the projection contents are easy to see for the observer.

  Although an example in which black characters are projected against a white background has been described, the present invention can also be applied to a case where white characters (bright spot portions) are projected against a black background (area with dark spots). In this case, whether the pixel position where the character (white character) is formed on the liquid crystal panel 122 based on the input data matches the defective pixel position (in this case, the black defect position) indicated by the defective pixel information. Determine whether or not.

  In the above description, an example of projecting a horizontally written character group in which characters are arranged in the horizontal direction has been described. However, the present invention can also be applied when projecting a vertically written character group in which characters are arranged in the vertical direction. In the case of vertical writing projection, a determination is made on the liquid crystal panel 122 as to whether or not the pixel position where the character is formed on the liquid crystal panel 122 matches the defective pixel position indicated by the defective pixel information based on the input data. This is performed for each horizontal block width (that is, for each character group for one column). When the match is determined, the character for one column is shifted by one pixel on the liquid crystal panel 122, with the upper limit being, for example, 10 pixels for each of the upper and lower sides in the vertical direction with respect to the initial position.

(Second embodiment)
The determination as to whether the pixel position where the character is formed on the liquid crystal panel 122 matches the defective pixel position indicated by the defective pixel information may be performed for each word on the liquid crystal panel 122. When the match is determined, the character interval constituting the word is expanded by one pixel from the initial position. One word represents, for example, one word unit in the case of English character notation and one part of speech unit in the case of kana character and kanji notation.

  FIG. 6 is a diagram for explaining pixel position determination according to the second embodiment, in which a square represents a pixel, and a cross indicates a white defect pixel. The upper character group “Hello!” Indicates the pixel position (initial position) of the character formed on the liquid crystal panel 122 when normal processing is performed based on data input to the projector control circuit 124. Show. According to the example shown in the upper part of FIG. 6, the third “l”, the second “o” from the right, and the “!” Character forming pixel at the right end include white defect pixels, resulting in missing characters. End up.

  When character loss occurs, the projector control circuit 124 widens each character interval of one word on the liquid crystal panel 122 by one pixel to the right. The lower character group “Hello!” In FIG. 6 indicates pixel positions of characters formed on the liquid crystal panel 122 after the character interval is widened. According to the example shown in the lower part of FIG. 6, the character forming pixel position does not match the white defective pixel position, and character missing does not occur. If the character formation pixel position and the white defect pixel position do not match, the projector unit control circuit 124 sets the character formation pixel position at that time as the pixel position at the time of character projection.

  If the match between the character formation pixel position and the white defect pixel position is not resolved even if the character interval is increased by one pixel, the projector control circuit 124 further increases the character interval of the same word on the liquid crystal panel 122 by one pixel. Let Thereafter, similarly, the projector unit control circuit 124 determines each character interval for one word on the liquid crystal panel 122, for example, up to four pixels until the match between the character formation pixel position and the white defect pixel position is resolved. Is expanded one pixel at a time. The projector control circuit 124 counts the number of pixels where the character forming pixel position and the white defect pixel position match at each character interval while increasing the character interval for one word, and stores the count value.

  If the match between the character formation pixel position and the white defect pixel position is not resolved even if the character interval is widened by 4 pixels with respect to the initial position, the projector control circuit 124 selects the character corresponding to the stored minimum count value. The character forming pixel position on the liquid crystal panel 122 according to the interval is set as the pixel position at the time of character projection for the word.

  The projector control circuit 124 performs the above-described processing for widening the character interval individually for all words on the liquid crystal panel 122.

  In the process of determining the actual character interval, the character image in the process of increasing the character interval by the projector unit control circuit 124 performing the above-described processing on the memory in the projector unit control circuit 124 before projection. Is not projected. That is, the projector unit control circuit 124 determines the pixel positions at the time of projection for all the words on the liquid crystal panel 122 and then actually generates a character image on the liquid crystal panel 122.

According to the second embodiment described above, the following operational effects can be obtained.
(1) Since the interval between characters is widened on the liquid crystal panel 122 so that the pixels forming the projected character (letters, numbers, symbols, etc.) avoid the defective pixels, it is possible to suppress missing characters in the projected image.
(2) Since the widening interval is within 4 pixels from the initial position, it is possible to suppress a sense of discomfort felt by the observer by changing the interval.
(3) If the match between the character formation pixel position and the white defect pixel position is not resolved even if the interval between characters is increased by 4 pixels, the character formation pixel position on the liquid crystal panel 122 that minimizes the number of matching pixels is determined. Since it is set as the pixel position at the time of character projection, the influence of a defective pixel can be suppressed to the minimum.
(4) Since the interval between characters in a word composed of a plurality of characters is changed in units of words, the character interval does not vary within the same word, and the projection content is easy to see for the observer.

  In the above description, the example of the horizontal writing character projection has been described. However, the present invention may be applied to the vertical writing character projection.

  The example in which the interval between characters is widely changed on the liquid crystal panel 122 has been described. However, if the character interval at the initial position is greater than or equal to a predetermined number of pixels (for example, 8 pixels), the character for one word is displayed on the liquid crystal panel 122. Each of the intervals may be narrowed by one pixel. In this case, the lower limit of the character interval is preferably at least two pixels.

  The size of each character for each word may be increased, decreased, or scaled. For example, the character size is changed within one block (8 pixels × 8 pixels in the above example) for each character. The size change may be changed at the same aspect ratio, or may be changed only in one of the vertical and horizontal directions. Further, the projector unit control circuit 124 determines the match between the character forming pixel position and the defective pixel position by changing the interval between the words within a predetermined pixel range, and the interval at which the match is eliminated or the matching pixel. The interval between the words may be set as the interval between the words as the interval between the words. This configuration can be considered as a configuration in which the words are translated while maintaining the spacing between the characters in the word composed of a plurality of characters. Here, the parallel translation direction in units of words is not limited to the character arrangement direction, but can be moved in various directions within a predetermined number of pixels, such as a direction perpendicular to the character arrangement direction or an oblique direction. Is preferred.

  The first embodiment and the second embodiment may be combined. The projector unit control circuit 124, for example, when the match between the character forming pixel position and the white defect pixel position has not been resolved even after the character interval for each word or the interval between words is changed according to the second embodiment. Further, by performing the shift processing in units of rows (columns) according to the first embodiment, the match between the character formation pixel position and the white defect pixel position is eliminated, or the number of matching pixels is minimized. Note that the character spacing for each word or the spacing between words according to the second embodiment may be changed after the row (column) unit shift processing according to the first embodiment.

  In the above example, the small area is displayed in a small area (for example, a pixel block of 8 pixels × 8 pixels) smaller than the display area of the display screen, and other small areas are displayed by significant display of character pixel positions different from the background in the small area As an example, the projection of a character image that displays information independent from the above is described. In displaying such a character image, the importance of one pixel increases as the size of the small area decreases. The present invention is particularly suitable when applied to such a case. Furthermore, the present invention can also be applied to a case where the number of pixels constituting the significant display is small, for example, when a figure or the like is projected as a line drawing (in this case, the number of pixels in the line width direction is small).

(Modification)
Select either a projection method that projects black characters on a white background or a projection method that projects white characters on a black background, depending on the number of black defective pixels and the number of white defective pixels indicated by the defective pixel information. May be. When (black defective pixel number)> (white defective pixel number) is satisfied, the projector control circuit 124 selects a method of projecting white characters against a black background, and (black defective pixel number) ≦ (white defective pixel). In the case of number), a method of projecting black characters on a white background is selected.

  The projector unit control circuit 124 selects whether the background color is white or black, and then performs the processing according to the first embodiment, the processing according to the second embodiment, or the first and second embodiments. Apply both treatments.

  According to the above modification, the light emission amount of the pixels forming the character group is larger than the light emission amount of the pixels forming the background portion, depending on the magnitude relationship between the number of black defective pixels and the number of white defective pixels. The liquid crystal panel 122 is configured to select the projection method to be set or the projection method in which the light emission amount of the pixels forming the character group is set smaller than the light emission amount of the pixels forming the background portion. Can be projected so as to suppress the influence of defective pixels.

  In the above description, an example in which the liquid crystal panel 122 is configured with a transmissive liquid crystal display element has been described. However, a reflective liquid crystal element or a transflective liquid crystal element may be used instead of the transmissive liquid crystal panel.

  Although the projector and the mobile phone 10 with a camera have been described as examples, the present invention may be applied to an electronic device that does not include the camera unit 150 and the communication control circuit 104 as long as the projector unit 120 is provided.

1 is a front view of a projector and a camera-equipped mobile phone according to a first embodiment of the present invention. It is a side view of a mobile phone with a projector and a camera. It is a block diagram explaining the structure of a mobile phone with a projector and a camera. It is a figure which illustrates the character image formed in the liquid crystal panel. It is a figure explaining pixel position determination. It is a figure explaining pixel position determination by a second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Mobile phone with a projector and a camera 10a ... Display part 10b ... Operation part (base part)
101 ... CPU
102 ... Memory 106 ... First operation member 113 ... Second operation member 120 ... Projector unit 1240 ... Memory

Claims (6)

An optical image forming element that controls the amount of light emitted for each pixel to form an optical image;
Projection control means for translating the character group in units of rows or columns in which the character groups are arranged so that the pixel positions of the character groups formed on the optical image forming elements avoid defective pixels included in the optical image forming elements. And a projector. An optical image forming element that controls the amount of light emitted for each pixel to form an optical image;
The interval of each character in a word composed of a plurality of characters is changed in units of words so that the pixel position of the character group formed on the light image forming element avoids defective pixels included in the light image forming element. A projector comprising projection control means. An optical image forming element that controls the amount of light emitted for each pixel to form an optical image;
The word group is maintained while maintaining the spacing of the characters in the word composed of the plurality of characters so that the pixel position of the character group formed on the light image forming element avoids defective pixels included in the light image forming element. And a projection control means for translating the projector. An optical image forming element that controls the amount of light emitted for each pixel to form an optical image;
The size of each character in a word composed of a plurality of characters is changed in units of words so that the pixel position of the character group formed on the light image forming element avoids defective pixels included in the light image forming element. A projector comprising projection control means. In the projector according to any one of claims 1 to 4,
The projection control means is (1) in a first projection method in which the light emission amount of pixels forming the character group is set larger than the light emission amount of pixels forming a background portion different from the character group. In this case, the pixel position of the character group avoids the first defective pixel that cannot be controlled while the light emission amount is substantially the minimum value, and (2) the light emission amount of the pixels forming the character group is the character group. In the case of the second projection method set to be smaller than the light emission amount of the pixels forming the background portion different from the above, the pixel position of the character group is the second position that cannot be controlled while the light emission amount is substantially the maximum value. A projector that performs control so as to avoid two defective pixels. The projector according to claim 5, wherein
Comparing the number of second defective pixels that are uncontrollable with the light emission amount being substantially maximum and the number of first defective pixels that are uncontrollable with the light emission amount being substantially minimum, When the number of the second defective pixels is smaller than the number of the first defective pixels, the first projection method is selected, and the number of the first defective pixels is smaller than the number of the second defective pixels. In this case, the projector further comprises a projection method selection means for selecting the second projection method.

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