# US 2021/0240020 A1 · Display devices with rotatable light emitting diodes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0240020 A1 - Document ID: US20210240020A1 - Status: Published application - Kind: A1 - Application number: 17/048,629 - Filed: 2018-09-07 - Published: 2021-08-05 - Earliest claimed: 2018-09-07 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: Chi-Hao Chang; Hsing-Hung Hsieh; Kuan-Ting Wu - Web page: https://patentgrep.com/patent/US20210240020A1 ## CPC - G02F 1/1323: {Arrangements for providing a switchable viewing angle} - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - F21S 4/28: rigid, e.g. LED bars - G02F 1/133603: {with LEDs} - G02F 1/133608: {including particular frames or supporting means} - G09G 3/342: {using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines} - G09G 2300/08: Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements - G09G 2320/068: for control of viewing angle adjustment - G09G 2358/00: Arrangements for display data security - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS ## Abstract In one example, a display device may include a liquid crystal panel and a direct type backlight unit having a light emitting diode (LED) package disposed behind the liquid crystal panel. The LED package may include a plurality of LEDs. The plurality of LEDs may have a first orientation towards the liquid crystal panel to provide a first viewing angle. Further, the display device may include a control unit to rotate the LED package to allow the plurality of LEDs to have a second orientation towards the liquid crystal panel to provide a second viewing angle. The second viewing angle may be narrower than the first viewing angle. ## Claims ### Claim 1 A display device comprising: a liquid crystal panel; a direct type backlight unit comprising a light emitting diode (LED) package disposed behind the liquid crystal panel, the LED package including a plurality of LEDs, wherein the plurality of LEDs is to have a first orientation towards the liquid crystal panel to provide a first viewing angle; and a control unit to rotate the LED package to allow the plurality of LEDs to have a second orientation towards the liquid crystal panel to provide a second viewing angle, the second viewing angle is narrower than the first viewing angle. ### Claim 2 (depends on 1) The display device of claim 1, wherein the control unit is to rotate the LED package at an angle in a range of 0 to 75 degrees. ### Claim 3 (depends on 1) The display device of claim 1, wherein the LED package comprises an LED bar, wherein the plurality of LEDs is disposed on the LED bar. ### Claim 4 (depends on 3) The display device of claim 3, wherein the LED package comprises a driving unit to drive the LED bar to rotate. ### Claim 5 (depends on 4) The display device of claim 4, wherein the driving unit comprises an electric motor, wherein one end of the LED bar is pivoted to a fixed support and other end of the LED bar is connected to an output shaft of the electric motor. ### Claim 6 (depends on 5) The display device of claim 5, wherein the driving unit comprises an electromagnetic switch to activate the electric motor to rotate the LED bar. ### Claim 7 A display device comprising: a liquid crystal panel including a liquid crystal layer, a direct type backlight unit comprising: a backplane; and a light emitting diode (LED) disposed on the backplane to provide light towards the liquid crystal panel, wherein the LED is to have a first orientation towards the liquid crystal panel to provide a first viewing angle; a driving unit coupled to the LED; and a control unit to rotate the LED, via the driving unit, to have a second orientation towards the liquid crystal panel to provide a second viewing angle, the second viewing angle is narrower than the first viewing angle. ### Claim 8 (depends on 7) The display device of claim 7, wherein the LED is disposed on an LED bar that is arranged vertically on the direct type backlight unit, and wherein the LED comprises a micro LED or a mini LED. ### Claim 9 (depends on 8) The display device of claim 8, wherein the control unit is to control the LED bar such that the LED bar is to rotate towards a vertical center viewing portion of the liquid crystal panel to provide the second viewing angle. ### Claim 10 (depends on 7) The display device of claim 7, wherein the light emitted from the LED is to exit the direct type backlight unit and transmit through the liquid crystal panel at a first angle in the first orientation, and wherein the light emitted from the LED is to exit the direct type backlight unit and transmit through the liquid crystal panel at a second angle in the second orientation. ### Claim 11 (depends on 7) The display device of claim 7, wherein the control unit is to control a degree of privacy on the liquid crystal panel by rotating the LED to multiple positions corresponding to multiple privacy modes, wherein each position is to transmit the light directly through the liquid crystal panel at a different angle, and wherein each privacy mode is having a viewing angle that is different from other privacy modes. ### Claim 12 (depends on 7) The display device of claim 7, wherein the liquid crystal panel comprises: a thin-film transistor (TFT) substrate; and a color filter (CF) substrate arranged above the TFT substrate, wherein the liquid crystal layer is arranged between the TFT substrate and the CF substrate. ### Claim 13 A non-transitory computer-readable storage medium comprising instructions that, when executed by a processor of a computing device, cause the processor to: detect an activation of a privacy mode of a display of the computing device, the display comprising a light emitting diode (LED) package having an orientation towards a liquid crystal panel to provide a first viewing angle of the display in a normal mode; and in response to detecting the activation of the privacy mode, rotate the LED package to a first angle in a range of 0 to 75 degrees to change light direction of the LED package to provide a second viewing angle of the display, wherein the second viewing angle is narrower than the first viewing angle. ### Claim 14 (depends on 13) The non-transitory computer-readable storage medium of claim 13, further comprising instructions to: receive an input to enable a second privacy mode of the display; and rotate the LED package to a second angle in the range of 0 to 75 degrees to change the light direction of the LED package to provide a third viewing angle of the display, wherein the third viewing angle is narrower than the second viewing angle. ### Claim 15 (depends on 13) The non-transitory computer-readable storage medium of claim 13, wherein the LED package comprises an LED, wherein the LED is at the orientation towards and parallel to the liquid crystal panel to provide the first viewing angle, and wherein the LED is rotated to the first angle towards a vertical center viewing portion of the liquid crystal panel to provide the second viewing angle.