TW201227686A - Liquid crystal display and driving method therefor - Google Patents

Abstract

The present invention provides a liquid crystal display including a display panel, a backlight module and a control and processing unit. The backlight module includes a light source and at least one light sensing unit, wherein the light sensing unit is configured to sense a brightness of the light and to sense the brightness of ambient light penetrating into the backlight module through the display panel. The control and processing unit controls the brightness of the light source according to a sensing result of the light sensing unit. The present invention further provides a driving method for a liquid crystal display.

Description

201227686 VI. Description of the Invention: [Technical Field] The present invention relates to a light-emitting diode liquid crystal display [Prior Art] A display device, in particular, a device and a driving method thereof. With the maturity of liquid crystal display technology, many mobile electronic devices are equipped with liquid crystal displays to increase their operational practicability. • ,, LCD monitors usually need to use - backlight to display images, =: control the brightness of the display by controlling the brightness of the backlight within a suitable range. When the liquid crystal display is mounted on a mobile electronic device, the ambient light intensity is different due to different working conditions. The display panel of the liquid positive display device can usually sense the ambient light by operating a photosensitive element. The brightness of the backlight is determined according to the sensing result of the photosensitive member. # Because the LED backlight has the advantages of low energy consumption and wide color gamut compared with the cold cathode tube moonlight source, it has gradually replaced the cold cathode tube backlight in the next generation liquid helium display. However:: to drive with the same drive current, the light-emitting diode: pole: ί: will gradually decay with the operation time, so the light: Ί usually f to use the photosensitive element to sense the backlight redundancy, Adjust the illuminating second-rate according to the change of brightness to maintain the same sorrow θ position. Especially in the use of the non-polar body for the preparation - the north and south of the j jba, the light source needs precise control - '0i5«: TW/A'10lB-TW' -...'... 201227686 In order to achieve the correct color mixing effect of the light-emitting diodes of various colors. For the above purposes, it is conventional to install a photosensitive element on the display panel to respectively sense the light source brightness: Li redundancy, thus having a high control circuit complexity and system cost. In view of the above, it is necessary to provide a liquid crystal display capable of instantly adjusting the illuminance of the backlight according to the ambient light level of the operation and the illuminance of the backlight at the same time by using the photosensitive element of only the moonlight module and the driving method thereof. . SUMMARY OF THE INVENTION The present invention is directed to a liquid crystal display and a method of driving the same that can be used only in the photosensitive unit of the backlight module, the brightness of the ambient light, and the brightness of the backlight. The invention provides a liquid crystal display comprising a display panel, a backlight module and a control processing unit. The display panel contains a - display surface. The backlight module includes a light source and at least one photosensitive unit. The light source provides backlighting to the display panel with - brightness. The photosensitive unit is configured to sense the brightness of the light source and sense ambient light entering the backlight module from the display surface of the display panel. The control processing unit controls the brightness of the light source according to the sensing result of the photosensitive unit. 5H photosensitive unit senses the brightness of the light source. In an embodiment, 01519-TW/A10105-1^201227686 degrees to output-light source brightness signal and sense the ambient light brightness to output ^-ambient light brightness, the money control The control unit controls the brightness of the light source according to the light source intensity signal and the ambient light brightness signal.

In another embodiment, the liquid crystal display further includes: a timing control state providing a sequence to the display panel, the light source, and the photosensitive unit), so that the photosensitive unit is not in the white-faced surface of the display panel When the light is on, the ambient light brightness signal is captured, and the light source brightness signal is taken during the black surface of the display panel and the light source is illuminated. The timing controller may be disposed in the display panel, and the control processing unit is Inside or inside the backlight module. This % Ming also proposes a driving method for a liquid crystal display. $ LCD display n contains - display panel and - backlight module. The back = group includes a light source and at least one photosensitive unit. The driving method comprises the steps of: continuously inputting a frame signal to the (four) panel, and each frame period of the frame signal includes a display period of a period of two periods, and a period of time during the frame period; The light source is enabled during the frame period to illuminate a light period, wherein the point T is overlapped with at least one portion of the display period and the black surface during the period of "two, but not m"; at this point Controlling the sense element operation-light source Γ, during the overlap of the lamp period and the tired face period; controlling the photosensitive unit to capture the second=freeness signal during the white screen and according to the light source brightness signal and the ring : ...the redundancy t number controls the brightness of one of the light sources. -G1519-TW / A101 〇5-TW^ 201227686 In one embodiment, the light source comprises a second color light source and a third color light that enables the light source during the frame period The step of the first color light source source is further included in the frame signal: the color light source is illuminated in the frame to illuminate the black box during the first frame period to illuminate the second lighting period frame The black enamel period is illuminated during the third light period; The first lighting period is enabled during the period of the lamp period and the third preferred period, and the second color light source is enabled during the face of the frame signal; and Between the pictures of the frame signal, the third color light source is enabled to be in the middle, and the first lighting period, the first lighting period and the black surface are overlapped. The liquid crystal display of the present invention and the driving method thereof The light source brightness signal and the ambient light brightness signal (4) (4) difficult signal - frame period is captured ' or captured between the frame signals. 4 [Embodiment] For the above and other purposes of the present invention, The features and advantages are more obvious. 'The following description will be given in conjunction with the accompanying drawings, and the same components are denoted by the same 唬 in the present invention, and are described in the following. In the drawings, only some of the components are shown and 'a component that is not directly related to the description of the present invention is shown. The liquid of the embodiment of the present invention is shown.

S, please refer to Figure 1, which shows

015i9-TW / A1 〇 105-TW

' V 201227686

The display of the crystal display, - Q ~ map. The liquid crystal display 1 can be a crystal display or a side optical liquid crystal display liquid: the liquid liquid is preferably a liquid crystal display using a light-emitting diode (UghtE_m=: 〗 backlight) g Dl〇de) Bar with a display panel 丨丨, a Μ Μ a control processing single... connected to the display panel ^; 仏 group 12' with & according to ambient light and ^

Controlling the backlight module. The luminance of the light source included in the group U is clearly 'the control processing sheet (9) in Fig. 1 is independent of the panel U and the optical mode, the group 12, but it is not intended to limit the invention. In other embodiments, the control processing unit A 13 can also be disposed in the display panel 11 or the backlight module 12. The non-panel 11 can be a conventional liquid crystal panel. The backlight module 12 is preferably a light emitting device. The diode backlight module includes a light source and a photosensitive unit 122 and/or 122. The photosensitive unit can be disposed at any suitable position in the backlight module 12, for example, on the wall surface of the backlight module 12 (122 in the figure) The position of the backlight module 12 is not limited thereto. The light source 121 can be a white LED array or a multi-color diode array, such as RGB three. The present invention is not limited to the three primary colors. It can be understood that the display panel 11 can be relatively different according to the structure of the backlight module 12, for example, when the light source 121 is a white LED array, the display panel 11 Can have a color filter - ...-01519-TW / A1 0105> TW ', 201227686, slice (known but not drawn); when the light source 121 is a multi-color diode array, the display panel 11 may not have the color filter layer. The at least one photosensitive unit 122 And/or 122, for example, a photo sensor or other suitable light sensing unit disposed in the backlight module 12 for simultaneously sensing a display surface from the display panel 11 The brightness of the ambient light entering the backlight module 12 and the brightness of the light source 121. It can be understood that the three-dimensional photosensitive unit 122 and/or 122' can be sensed to enter from the display surface 111 of the display panel 11. Ambient light, other structural layers (such as, but not limited to, a diffusion sheet 123 and a diamond lens 124) disposed between the photosensitive unit 122 and/or 122 and the display panel u in the backlight module 12 The position of the photosensitive unit 122 and/or 122' is preferably at least one opening for the entrance of ambient light. It is to be understood that the position of the photosensitive unit 122 and/or 122 is not particularly limited as long as it is located therein. The backlight module 12 is capable of sensing the same at the same time The light source 121 and the ambient light entering from the display surface 1U of the display panel u. However, when the light source 121 is a multi-color diode array, it is preferable to provide at least one photosensitive unit in each color of the light-emitting diode. The position of the body is relative to detect the brightness emitted by the light-emitting diodes of different colors. [Figure 2 shows a block diagram of controlling the brightness of the light source 121 in the liquid crystal display of the embodiment of the present invention. The processing unit 13 receives one of the photometric brightness signals s from the photosensitive unit 122 and/or 122, 01519-TW/ai〇i〇5-tw 201227686 and a light source brightness signal Ss to output a control according to the signal such as 忒The signal s to the light source 121 controls its luminance by phase. The % ambient light luminance signal S] indicates the current operating environment of the liquid crystal display, and the control processing unit 13 controls the light source 121 to emit light of appropriate brightness according to the current operating environment. For example, when the environment is strong, such as outdoors, the control processing unit 13 controls the high-intensity illumination of the light source 121 to clearly display the image to be displayed; The control processing unit 13 controls the light source 121 to emit light at a lower luminance in an environment where the ambient light is weak. In other words, the control handles the single 13 lines according to the LCD display! The operating environment controls the light source 121 < the brightness of the light is within an appropriate range. One province light source redundancy ##S2 indicates that the backlight module 12 has the following two degrees:: degrees. The control processing unit 13 compares the current luminance and the initial value to determine whether the light source 121 is attenuated; wherein the subtraction may be that the liquid crystal display 1 is discharged: two cases when the control processing unit 13 determines that The light source μ (4) has a light intensity lower than the initial value - the preset value or - the preset ratio is 'to control the light source i with a souther drive current so that the light intensity emitted by the light source m is between the two. In addition, when the light source (2) is a multi-color diode array, the two-source luminance signal s2 may include luminance signals of different colors: for example, O1519-TW/A10105-TW ............; 201227686 Red shell signal Ssr, green brightness signal S2G and blue brightness signal SSB, etc., but not limited thereto. The control processing unit 13 respectively compares the brightness signals of different colors with the initial values of the respective colors. Controlling the luminous intensity of the light-emitting diodes of different colors to maintain the color mixing effect as a preset color gamut range. As shown in FIG. 3, it shows a timing chart of driving signals of the liquid crystal display device according to the embodiment of the present invention. The light source 121 is, for example, a white light diode array; the timings may be provided by a timing controller (not shown) included in the liquid crystal display 1 or by other independent controllers. The controller can be disposed in the display panel 11, the backlight module 12 or the control processing unit 13. As shown, the timing device provides timing to the display panel 1 and the light source 121 and the photosensitive unit m and/or (2), when The sequence controller continuously inputs the frame signal to the display panel 11; the timing provided to the display panel 11 is used to control the rotation of the liquid crystal, where the backlight module 12 emits light during the period (enable period) The ratio can pass through the display panel u to the outside of its display surface (1) = 'and _ no ambient light outside the panel 11 can be passed through the display panel (1) 19 through the display panel 11 and the face to the backlight The photosensitive unit 122 and/or gamma are received; otherwise, the low: crystal layer (the conventional liquid is not shown in the display panel 11), k is supplied to the timing system of the light source 121.

S

01519-TW/A]〇]〇5-TW 201227686 is used to illuminate or extinguish the light source (2); the timing provided to (4) light unit i22 and/or coffee is used to control the photosensitive sheet a i22 and/or 122撷The temperature signal is taken, including the 丄 luminance signal S2. Including the money S! and the light source, the moon and the township...the third figure' is continuously input to the display panel 11

^Box (4) A frame period tf, including two enabling times I display... Guangguang t2' where the enabling time h is used to make the liquid crystal display: during the display period of the image, the enabling time & During the chalky period of 12, the de-energy time === the black-faced period of the display panel 11. f; at least part of the t4 between t and t during the display period ti and the black surface, in other words, the light source surface overlaps ^ or between. The light source is.../light source signal 2 in the second light source, 121 bright h and the lighting period t4 _ ^ is the black surface period or time period. The photosensitive unit ambient light luminance signal §1; ==^ the brightness of the light to generate t3 and the light source m is not illuminated. The panel 11 is a driving of a crystal display during a white screen. The liquid of the embodiment of the present invention is shown as -: a color: a second timing diagram, wherein the light source 121 is a primary color-pole array. In this embodiment, each frame period of the frame signal input to the display panel u is continuously detected by 01519-TW/A10105-TW - η 201227686 ·_, because the luminance signals of different color lights must be separately sensed. The lighting time of the diode of each color is not limited to the portion (v, v, v,,) of the display gate, but at least the black-faced period t2 of the panel 11 is not included. At least a part of the weight is the most important, so that the photosensitive unit 122 and/or 122 can respectively sense different colors and color lights, as shown in the figure, the red light emitting diode has at least t4R lighting = shoulder: plate " black At least part of the t2 period

In: take = light early 122 and / or 122 ' during the lighting period t4R two take = such as sampling time TS2R) to output red light brightness letter = two "light diode" at least t4G lighting period and the display = At least a portion of the black frame period t2 overlaps, and the light sensing == and/or 122' is sampled during the lighting period t4Q (for example, == TS2G) to output a green light luminance signal; the blue light emitting diode to the ^ The light-emitting period of t4B overlaps with at least a portion of the black-faced period t2 of the display panel U, and the photosensitive sheet A is sampled during the lighting period t4B (for example, when sampling = ts2B) to output the brightness of the light. The signals t············································ The display panel 11 is in the white-faced period t3 and the light source 121 is not lit. In addition, the photosensitive unit 122 and/or 122 does not continuously capture the luminance signal during the frame period tf, and may also be 01519 per temple/ Fine-aged top, ._ 5 201227686 Inter-preset time or preset number of pictures _ take a number of frames = brightness signal, the preset The number of presets or presets may be determined according to the sensitivity of the second adjustment. As shown in FIG. 5, the driving method of the liquid crystal display of the present invention comprises the following steps: continuously inputting the frame signal to the second display panel, wherein the image Each frame period of the frame @号 includes - display period, a black surface period, and a white surface period (step Μ .: the frame signal is enabled during the frame to illuminate a light source - during the production period 'where the lighting period overlaps with at least a portion of the display period and the black box, and the overlap period S20); during the lighting period and the black box period Controlling the photosensitive unit to capture the light source brightness signal (step ^); controlling the photosensitive single 4 - ambient light brightness signal ((4) S 4 G) during the white surface; and according to the cut, brightness signal and the ambient light The degree k controls the brightness of one of the light sources (steps u, and again. knows S5G). The detailed description of each step of the embodiment has been disclosed in 筮._.'...- by ^人,±勺丁丁弟3 4, and related descriptions, so I won’t go into details here. The smashing of the 骷 Λ Λ 装置 装置 之 之 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶 液晶One can use only the photosensitive unit set in the first, the ai in the first loose group to simultaneously detect the % ambient light change and the light source in the #古千哭々θε _ > 么 九 冗 冗 , , , , , , , , , , , , , The award is not within an appropriate range.

'01519-TW / A1 〇105-TW 13 201227686 Difficult to heat does not invent a ... π column reveals, lack of hair, = hair:, any of the hair _ operative field;:: guang 4 who's away from the spirit of the invention and Within the scope, -: various changes and modifications. Therefore, the scope of protection of the present invention: The attached towel is subject to the definition of patent scope. ^

01519-TW/A10105-TW Τ4 201227686 [Schematic description of the drawings] Fig. 1 is a view showing a liquid crystal display according to an embodiment of the present invention. Fig. 2 is a block diagram showing the control of the brightness of a light source in the liquid crystal display of the embodiment of the present invention. Fig. 3 is a timing chart showing a driving signal of a liquid crystal display according to an embodiment of the present invention, wherein the light source is a white LED array. Fig. 4 is a timing chart showing a driving signal of a liquid crystal display according to an embodiment of the present invention, wherein the light source is a three primary color diode array. Fig. 5 is a flow chart showing the driving method of the liquid crystal display of the embodiment of the invention - ' - - τ * . [Main component symbol description] 1 LCD display 11 Display panel 111 Display panel display surface 12 Backlight module 121 Light source 122 Photosensitive unit 122' Photosensitive unit 123 Diffusion sheet 124 Rigid lens 13 Control processing unit Si Ambient light intensity signal s2 Light source Luminance signal s Control signal tl Display period h Black plane period h White plane period U-W" Lighting period tf Frame period ^4R Red light lighting period t4G Green light lighting period t4B Blue light lighting period 0 Opening tsi, Ts2, ts2R, ts2G., ts2B sampling time r--. *

0i5r^TW/Al01()5-TW 15

Claims (1)

201227686 VII. Shenqing Patent Range: 1 'A liquid crystal display, comprising: a display panel comprising a display surface; a backlight module comprising: - a light source providing backlight to the display panel with a brightness; and at least one photosensitive unit Sensing the brightness of the light source and sensing the brightness of the ambient light entering the backlight module from the display surface of the display panel; and the processing unit is controlled according to the sensing result of one of the photosensitive units The brightness of the light source. 2. The liquid crystal display according to claim 1, wherein the backlight unit further comprises a diffusion sheet and a diamond lens disposed on the backlight module, and the sin is adjacent to one side of the display panel, the diffusion sheet and the diffusion sheet The diamond lens is provided with at least one opening relative to the position of the photosensitive unit. 3. The liquid crystal display according to the third aspect of the invention, wherein the photosensitive unit senses the brightness of the light source to output a light source brightness signal and sense the ambient light brightness to output an ambient light brightness signal, and the control processing unit The brightness of the light source is controlled according to the light source brightness signal and the ambient light brightness signal. 4. The liquid crystal display according to item 3 of the patent application, further comprising: a day-order controller providing timing to the display panel, the light source and the photosensitive unit 'to enable the photosensitive unit to be in a white surface of the display panel and When the light source is not lit, the ambient light brightness signal '01519-TW / A10105-TW 201227686 is taken and the brightness signal of the light source is taken during one black surface of the display panel. According to the liquid crystal display of the fourth aspect of the patent application, the Japanese control unit is disposed in the display panel, the control unit or the backlight module. 6. According to the scope of the patent application! The liquid crystal display of the item: a white light emitting diode array or a multi-color light emitting: pole: array 7 _ - a liquid crystal display driving method, the liquid crystal display crying includes a panel and a backlight module, the backlight The module comprises two light sources and a photosensitive unit. The driving method comprises the following steps: the mother frame period includes a display period during the white surface; and the frame input period enables the light source to point: - during the lighting period, wherein the lighting period and the display period and the pool crystal are not heavy with the white chalk surface, and the overlap period during the lighting period and the black surface is controlled Photosensitive single-collecting-light source brightness signal; controlling the photosensitive unit to capture an ambient light brightness signal during the white-faced surface; and according to. The light source redundancy signal and the ambient light brightness signal control the brightness of one of the light sources. Continuously inputting a frame signal to the display panel, wherein the frame signal is blackened during the blackout period and 01519-TW7A10105-TW* • 17 201227686, r- ' . , , 8. According to the driving method of the seventh application patent scope, The light source brightness signal and the ambient light brightness signal are captured during each frame of the frame signal, or are captured during a portion of the frame signal. 9. The driving method according to claim 7, wherein the light source comprises a first color light source, a second color light source and a third color light source, and the light source is enabled during the frame of the frame signal. The step further includes: during the frame of the frame signal, enabling the first color light source to illuminate a first lighting period; during the frame of the frame signal, during the black surface Enabling the second color light source to illuminate a second lighting period; and during the black surface during the frame of the frame signal, enabling the third color light source to illuminate a third lighting period. 10. The driving method according to claim 9, wherein the period during which the first lighting period, the second lighting period, and the third lighting period overlap with the black surface period do not overlap each other. η. According to the driver of the ninth application patent range, wherein the step of controlling the photosensitive unit during the overlap of the lighting period and the black screen period to take a light source party signal comprises: Lighting period = the second lighting period and the third lighting period respectively control the sense that there is no light source to obtain a light source brightness signal. 01519-TW / ΑΤΟ 1 〇5-T W S